Santosh Satpathy | Sambalpur University, (original) (raw)

Papers by Santosh Satpathy

Journal of Advanced Zoology

Bio-photovoltaics (BPV) is sustainable energy production technology that utilize photosynthetic o... more Bio-photovoltaics (BPV) is sustainable energy production technology that utilize photosynthetic organisms and convert it into electricity. This Study has been carried out to study the photosynthetic efficiency of three microalgae on a Reduced Graphene Oxide (RGO) anode surface. RGO, with its exceptional electrical conductivity and large surface area, presents an attractive platform for enhancing the performance of BPV systems. The work aims to investigate the combined effect of microalgae and RGO anodes for use in BPV technology. RGO was synthesized and characterized on which Chlorella vulgaris, Gloeocapsa and Synechocystis were allowed to grow. A model BPV system was assembled, incorporating the microalgae and cyanobacteria as photoactive agents and RGO as the anode surface. The system was subjected to different experimental condition and photosynthetic efficiency, current generation, and power output were collected and analysed. Results demonstrated a significant improvement in th...

ECS Journal of Solid State Science and Technology

This paper discusses the temperature and frequency-dependent dielectric and electrical transport ... more This paper discusses the temperature and frequency-dependent dielectric and electrical transport properties of cobalt ferrite and its suitability for thermistor applications. The material is prepared through a high-temperature solid-state reaction route. The formation of the materials is checked by using an X-ray diffraction. Microstructure study is done through SEM analysis. Analysis of dielectric data shows a thermally activated relaxation process occuring in the material in the studied frequency range. Analysis of Nyquist plots at different temperatures reveal the contribution of grain to the overall electrical response of the compound. The variation of dc conductivity with temperature shows the NTCR behavior of the material. Looking into the strong dependence of resistivity on temperature, the thermistor parameters are evaluated using the grain resistance at different temperatures, which suggest the possible application for thermistor-based devices and as a temperature sensor. T...

Nanoparticles Reinforced Metal Nanocomposites, 2023

Nanoparticles Reinforced Metal Nanocomposites, 2023

Brazilian Journal of Physics

Emerging Materials Research

The solid-state reaction technique is used to prepare the samples 0.3(BiFeO3)–0.7(PbZrO3) and 0.5... more The solid-state reaction technique is used to prepare the samples 0.3(BiFeO3)–0.7(PbZrO3) and 0.5(BiFeO3)–0.5(PbZrO3). Structural parameters including percent crystallinity, dislocation density, microstrain, and the average size of crystallites are calculated using the X-Ray Diffraction (XRD) data at room temperature. The SEM micrographs reveal the spherical, densely packed natures of the samples with low porosity. Dielectric constant and dielectric loss increases with the rising content of Bismuth ferrite in the materials. The performance of the materials as an NTC thermistor in the temperature range 300–450°C is discussed. The values of the Thermistor constant (i.e. in the range of 3911–6247K) and the range of sensitivity index (−1 to −9%) confirmed the potential use of the samples as NTC thermistors. The frequency-dependent ac conductivity satisfies the universal Jonscher power law. The high density of states is determined from the frequency and temperature-dependent ac conductiv...

The European Physical Journal Applied Physics

The composite, BiFeO3-LiVO3 was synthesized through a solid-state reaction technique. The X-ray d... more The composite, BiFeO3-LiVO3 was synthesized through a solid-state reaction technique. The X-ray diffraction (XRD) confirmed the formation of the tetragonal structure at room temperature. The dielectric constant and dielectric loss increased with the rise in temperature. The Nyquist plot projected the contribution of bulk effect and a slight indication of grain boundary effect. The presence of a temperature-dependent relaxation process occurred in the material. Electrical modulus confirmed the non-Debye type relaxation and indicated the asymmetric peak broadening for the spread of relaxation time. The activation energies were calculated from the ac conductivity by linear fitting. The fitted Jonscher power law was very close which implied a similar type of charge carrier which exists in the conduction mechanism for the system. Thermistor parameters were evaluated using the grain resistance for different temperatures.

Brazilian Journal of Physics

Bulletin of Materials Science

Iranian Journal of Science and Technology, Transactions A: Science, 2019

The (1 − x)(BiFe 1−y Gd y O 3)−x(PbZrO 3) [x = 0.5, y = 0.05, 0.10, 0.15, 0.20] were synthesized ... more The (1 − x)(BiFe 1−y Gd y O 3)−x(PbZrO 3) [x = 0.5, y = 0.05, 0.10, 0.15, 0.20] were synthesized using a high-temperature solidstate reaction technique. X-ray analysis confirms the formation of the composites. The dielectric properties of the composites were studied. The hysteresis loop suggested that the materials were lossy. The impedance parameters were studied in a wide range of frequency (10 2-10 6 Hz) at different temperatures for all samples. The Nyquist plot suggested the contribution of bulk effect as well as grain boundary effect and the bulk resistance deceased with a rise in temperature for all the samples. The electrical transport confirmed the presence of hopping mechanism in the materials. The dc conductivity of the materials increased with a rise in temperature. The frequency variation of ac conductivity obeyed the Jonscher's universal power law and confirmed the small polaron (SP) tunneling effect due to low activation energy for all the samples. Temperature dependence of dc and ac conductivity indicated the thermally activated process of the materials.

Transactions on Electrical and Electronic Materials, 2022

Synthesis of polycrystalline samples of Bi1–xRxFeO3 (R = Nd, Gd and La) with x = 0.5, 0.6, 0.7 an... more Synthesis of polycrystalline samples of Bi1–xRxFeO3 (R = Nd, Gd and La) with x = 0.5, 0.6, 0.7 and 0.8 were demonstrated through solid-state reaction method at high temperature. The X-ray diffraction technique confirmed the orthorhombic phase of the samples and structural parameters like microstrain, crystallinity percentage, and dislocation density of the composites were calculated using an approximation method from XRD data. A negative temperature coefficient of resistance (NTCR) behavior of all the samples at various temperatures was confirmed from the variation of resistance with temperature. The inverse dependence of dielectric constant with a doping concentration of rare earth metal was identified. Bismuth ferrite with dopants Nd, La, and Gd was found to have the potential to be used as an NTC Thermistor by enhancing the value of thermistor constant (β), sensitivity factor (α), and stability factor.

Advances in Applied Ceramics, 2012

ABSTRACT

Micro and Nanosystems

: CoFe2O4, the single-phase nano crystalline materials, has potential applications in information... more : CoFe2O4, the single-phase nano crystalline materials, has potential applications in information storage, sensors and actuators. This ferrite has a tetragonal P4mm crystallographic structure and having crystallite size 42 nm. The CoFe2O4 is prepared by different techniques. The spinal structure of dielectric and hysteresis study disclosed ferroelectric nature over a broad spectrum of frequency and temperature with low dielectric loss. Based on Spinal structure phase metal oxides, a distinct range of properties became useful for different applications. Spinal structure materials have attractive characteristics in electrical conductivity, dielectric constant, dielectric loss, structural, and magnetic properties. Spinal structure materials showed efficient essential properties for photovoltaic solar cells.

Materials Today: Proceedings

Materials Today: Proceedings

Journal of Advanced Dielectrics

ð1 À yÞ(BiFe 1Àx GdxO 3)-y(PbZrO 3) composites ðy ¼ 0:5Þ, having four different Gd concentrations... more ð1 À yÞ(BiFe 1Àx GdxO 3)-y(PbZrO 3) composites ðy ¼ 0:5Þ, having four different Gd concentrations (x ¼ 0:05, 0.1, 0.15, and 0.2), were synthesized and their structural, dielectric, and ferroelectric properties have been studied using different characterization techniques. In addition, to investigate the effect of ion implantation on the microstructure and dielectric properties, these composites were exposed to 2 MeV He þ-ions. Modifications of the structure, surface morphology and electrical properties of the samples before and after ion exposure were demonstrated using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) technique, and LCR meter. The compositional analysis was carried out using energy dispersive X-ray spectrometry (EDS). XRD results demonstrated a decrease in the intensity profile of the dominant peak by a factor of 6 showing a degradation of the crystallinity. Willliamson-Hall (WH) plots reveal reduction in the grain size after irradiation along with an increase in strain and dislocation density. A decrease in the dielectric constant and loss has been recorded after ion beam exposure with reduction in ac conductivity value. The contribution of grain and grain boundary effect in conduction mechanism has been addressed using Nyquist plots. All the samples demonstrate a lossy ferroelectric loop which shows a clear modification upon irradiation. The role of structural defects modifying the physical properties of the composite materials is discussed in this work.

Advanced Materials Letters, 2015

Journal of Rare Earths, 2015

ABSTRACT 0.5BiDyxFe1–xO3-0.5PbTiO3(0.5BDxF1–x-0.5PT) (x=0.00, 0.05, 0.10, 0.15, 0.20) multiferroi... more ABSTRACT 0.5BiDyxFe1–xO3-0.5PbTiO3(0.5BDxF1–x-0.5PT) (x=0.00, 0.05, 0.10, 0.15, 0.20) multiferroic composites were prepared by conventional solid state reaction method. Structural characterization was performed by X-ray diffraction and the materials showed tetragonal structure at room temperature. Surface morphology of the composites was studied by a scanning electron microscope (SEM). Frequency and temperature dependence of dielectric constant (ɛr) and dielectric loss (tanδ) of 0.5BDxF1–x-0.5PT were measured in a wide range of frequency (100 Hz to 1 MHz) and temperature (25 to 400 °C). The analysis of the study showed that the ɛr and tan δ decreased with increasing frequency in the given range for all the samples which could be explained through the occurrence of dipole relaxation process. The effect of substitution of rare earth element dysprosium (Dy) showed increase in ɛr in all the samples prepared for different concentrations from 0.00 to 0.20. An explanation for high value of ɛr for Dy modified 0.5BiFeO3-0.5PbTiO3 (0.5BF–0.5PT) compared to Gd modified 0.5BF-0.5PT was provided. The variation of AC conductivity with inverse temperature found to obey the Arrhenius equation and the composites showed negative temperature coefficient of resistance (NTCR) behavior. The activation energy was found to be in the range from 0.25 to 0.40 eV for all the studied samples.

Acta Metallurgica Sinica (English Letters), 2015

The Lanthanum-doped bismuth ferrite-lead titanate compositions of 0.5(BiLa x Fe 1-x O 3)-0.5(PbTi... more The Lanthanum-doped bismuth ferrite-lead titanate compositions of 0.5(BiLa x Fe 1-x O 3)-0.5(PbTiO 3) (x = 0.05, 0.10, 0.15, 0.20) (BL x F 1-x-PT) were prepared by mixed oxide method. Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature. The lattice parameter c/a ratio decreases with increasing of La(x = 0.05-0.20) concentration of the composites. The effect of charge carrier/ion hopping mechanism, conductivity, relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range (10 2-10 6 Hz) at different temperatures. The nature of Nyquist plot confirms the presence of bulk effects only, and non-Debye type of relaxation processes occurs in the composites. The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials. The ac conductivity and dc conductivity of the materials were studied, and the activation energy found to be 0.81, 0.77, 0.76 and 0.74 eV for all compositions of x = 0.05-0.20 at different temperatures (200-300°C).

Journal of Advanced Zoology

Bio-photovoltaics (BPV) is sustainable energy production technology that utilize photosynthetic o... more Bio-photovoltaics (BPV) is sustainable energy production technology that utilize photosynthetic organisms and convert it into electricity. This Study has been carried out to study the photosynthetic efficiency of three microalgae on a Reduced Graphene Oxide (RGO) anode surface. RGO, with its exceptional electrical conductivity and large surface area, presents an attractive platform for enhancing the performance of BPV systems. The work aims to investigate the combined effect of microalgae and RGO anodes for use in BPV technology. RGO was synthesized and characterized on which Chlorella vulgaris, Gloeocapsa and Synechocystis were allowed to grow. A model BPV system was assembled, incorporating the microalgae and cyanobacteria as photoactive agents and RGO as the anode surface. The system was subjected to different experimental condition and photosynthetic efficiency, current generation, and power output were collected and analysed. Results demonstrated a significant improvement in th...

ECS Journal of Solid State Science and Technology

This paper discusses the temperature and frequency-dependent dielectric and electrical transport ... more This paper discusses the temperature and frequency-dependent dielectric and electrical transport properties of cobalt ferrite and its suitability for thermistor applications. The material is prepared through a high-temperature solid-state reaction route. The formation of the materials is checked by using an X-ray diffraction. Microstructure study is done through SEM analysis. Analysis of dielectric data shows a thermally activated relaxation process occuring in the material in the studied frequency range. Analysis of Nyquist plots at different temperatures reveal the contribution of grain to the overall electrical response of the compound. The variation of dc conductivity with temperature shows the NTCR behavior of the material. Looking into the strong dependence of resistivity on temperature, the thermistor parameters are evaluated using the grain resistance at different temperatures, which suggest the possible application for thermistor-based devices and as a temperature sensor. T...

Nanoparticles Reinforced Metal Nanocomposites, 2023

Nanoparticles Reinforced Metal Nanocomposites, 2023

Brazilian Journal of Physics

Emerging Materials Research

The solid-state reaction technique is used to prepare the samples 0.3(BiFeO3)–0.7(PbZrO3) and 0.5... more The solid-state reaction technique is used to prepare the samples 0.3(BiFeO3)–0.7(PbZrO3) and 0.5(BiFeO3)–0.5(PbZrO3). Structural parameters including percent crystallinity, dislocation density, microstrain, and the average size of crystallites are calculated using the X-Ray Diffraction (XRD) data at room temperature. The SEM micrographs reveal the spherical, densely packed natures of the samples with low porosity. Dielectric constant and dielectric loss increases with the rising content of Bismuth ferrite in the materials. The performance of the materials as an NTC thermistor in the temperature range 300–450°C is discussed. The values of the Thermistor constant (i.e. in the range of 3911–6247K) and the range of sensitivity index (−1 to −9%) confirmed the potential use of the samples as NTC thermistors. The frequency-dependent ac conductivity satisfies the universal Jonscher power law. The high density of states is determined from the frequency and temperature-dependent ac conductiv...

The European Physical Journal Applied Physics

The composite, BiFeO3-LiVO3 was synthesized through a solid-state reaction technique. The X-ray d... more The composite, BiFeO3-LiVO3 was synthesized through a solid-state reaction technique. The X-ray diffraction (XRD) confirmed the formation of the tetragonal structure at room temperature. The dielectric constant and dielectric loss increased with the rise in temperature. The Nyquist plot projected the contribution of bulk effect and a slight indication of grain boundary effect. The presence of a temperature-dependent relaxation process occurred in the material. Electrical modulus confirmed the non-Debye type relaxation and indicated the asymmetric peak broadening for the spread of relaxation time. The activation energies were calculated from the ac conductivity by linear fitting. The fitted Jonscher power law was very close which implied a similar type of charge carrier which exists in the conduction mechanism for the system. Thermistor parameters were evaluated using the grain resistance for different temperatures.

Brazilian Journal of Physics

Bulletin of Materials Science

Iranian Journal of Science and Technology, Transactions A: Science, 2019

The (1 − x)(BiFe 1−y Gd y O 3)−x(PbZrO 3) [x = 0.5, y = 0.05, 0.10, 0.15, 0.20] were synthesized ... more The (1 − x)(BiFe 1−y Gd y O 3)−x(PbZrO 3) [x = 0.5, y = 0.05, 0.10, 0.15, 0.20] were synthesized using a high-temperature solidstate reaction technique. X-ray analysis confirms the formation of the composites. The dielectric properties of the composites were studied. The hysteresis loop suggested that the materials were lossy. The impedance parameters were studied in a wide range of frequency (10 2-10 6 Hz) at different temperatures for all samples. The Nyquist plot suggested the contribution of bulk effect as well as grain boundary effect and the bulk resistance deceased with a rise in temperature for all the samples. The electrical transport confirmed the presence of hopping mechanism in the materials. The dc conductivity of the materials increased with a rise in temperature. The frequency variation of ac conductivity obeyed the Jonscher's universal power law and confirmed the small polaron (SP) tunneling effect due to low activation energy for all the samples. Temperature dependence of dc and ac conductivity indicated the thermally activated process of the materials.

Transactions on Electrical and Electronic Materials, 2022

Synthesis of polycrystalline samples of Bi1–xRxFeO3 (R = Nd, Gd and La) with x = 0.5, 0.6, 0.7 an... more Synthesis of polycrystalline samples of Bi1–xRxFeO3 (R = Nd, Gd and La) with x = 0.5, 0.6, 0.7 and 0.8 were demonstrated through solid-state reaction method at high temperature. The X-ray diffraction technique confirmed the orthorhombic phase of the samples and structural parameters like microstrain, crystallinity percentage, and dislocation density of the composites were calculated using an approximation method from XRD data. A negative temperature coefficient of resistance (NTCR) behavior of all the samples at various temperatures was confirmed from the variation of resistance with temperature. The inverse dependence of dielectric constant with a doping concentration of rare earth metal was identified. Bismuth ferrite with dopants Nd, La, and Gd was found to have the potential to be used as an NTC Thermistor by enhancing the value of thermistor constant (β), sensitivity factor (α), and stability factor.

Advances in Applied Ceramics, 2012

ABSTRACT

Micro and Nanosystems

: CoFe2O4, the single-phase nano crystalline materials, has potential applications in information... more : CoFe2O4, the single-phase nano crystalline materials, has potential applications in information storage, sensors and actuators. This ferrite has a tetragonal P4mm crystallographic structure and having crystallite size 42 nm. The CoFe2O4 is prepared by different techniques. The spinal structure of dielectric and hysteresis study disclosed ferroelectric nature over a broad spectrum of frequency and temperature with low dielectric loss. Based on Spinal structure phase metal oxides, a distinct range of properties became useful for different applications. Spinal structure materials have attractive characteristics in electrical conductivity, dielectric constant, dielectric loss, structural, and magnetic properties. Spinal structure materials showed efficient essential properties for photovoltaic solar cells.

Materials Today: Proceedings

Materials Today: Proceedings

Journal of Advanced Dielectrics

ð1 À yÞ(BiFe 1Àx GdxO 3)-y(PbZrO 3) composites ðy ¼ 0:5Þ, having four different Gd concentrations... more ð1 À yÞ(BiFe 1Àx GdxO 3)-y(PbZrO 3) composites ðy ¼ 0:5Þ, having four different Gd concentrations (x ¼ 0:05, 0.1, 0.15, and 0.2), were synthesized and their structural, dielectric, and ferroelectric properties have been studied using different characterization techniques. In addition, to investigate the effect of ion implantation on the microstructure and dielectric properties, these composites were exposed to 2 MeV He þ-ions. Modifications of the structure, surface morphology and electrical properties of the samples before and after ion exposure were demonstrated using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) technique, and LCR meter. The compositional analysis was carried out using energy dispersive X-ray spectrometry (EDS). XRD results demonstrated a decrease in the intensity profile of the dominant peak by a factor of 6 showing a degradation of the crystallinity. Willliamson-Hall (WH) plots reveal reduction in the grain size after irradiation along with an increase in strain and dislocation density. A decrease in the dielectric constant and loss has been recorded after ion beam exposure with reduction in ac conductivity value. The contribution of grain and grain boundary effect in conduction mechanism has been addressed using Nyquist plots. All the samples demonstrate a lossy ferroelectric loop which shows a clear modification upon irradiation. The role of structural defects modifying the physical properties of the composite materials is discussed in this work.

Advanced Materials Letters, 2015

Journal of Rare Earths, 2015

ABSTRACT 0.5BiDyxFe1–xO3-0.5PbTiO3(0.5BDxF1–x-0.5PT) (x=0.00, 0.05, 0.10, 0.15, 0.20) multiferroi... more ABSTRACT 0.5BiDyxFe1–xO3-0.5PbTiO3(0.5BDxF1–x-0.5PT) (x=0.00, 0.05, 0.10, 0.15, 0.20) multiferroic composites were prepared by conventional solid state reaction method. Structural characterization was performed by X-ray diffraction and the materials showed tetragonal structure at room temperature. Surface morphology of the composites was studied by a scanning electron microscope (SEM). Frequency and temperature dependence of dielectric constant (ɛr) and dielectric loss (tanδ) of 0.5BDxF1–x-0.5PT were measured in a wide range of frequency (100 Hz to 1 MHz) and temperature (25 to 400 °C). The analysis of the study showed that the ɛr and tan δ decreased with increasing frequency in the given range for all the samples which could be explained through the occurrence of dipole relaxation process. The effect of substitution of rare earth element dysprosium (Dy) showed increase in ɛr in all the samples prepared for different concentrations from 0.00 to 0.20. An explanation for high value of ɛr for Dy modified 0.5BiFeO3-0.5PbTiO3 (0.5BF–0.5PT) compared to Gd modified 0.5BF-0.5PT was provided. The variation of AC conductivity with inverse temperature found to obey the Arrhenius equation and the composites showed negative temperature coefficient of resistance (NTCR) behavior. The activation energy was found to be in the range from 0.25 to 0.40 eV for all the studied samples.

Acta Metallurgica Sinica (English Letters), 2015

The Lanthanum-doped bismuth ferrite-lead titanate compositions of 0.5(BiLa x Fe 1-x O 3)-0.5(PbTi... more The Lanthanum-doped bismuth ferrite-lead titanate compositions of 0.5(BiLa x Fe 1-x O 3)-0.5(PbTiO 3) (x = 0.05, 0.10, 0.15, 0.20) (BL x F 1-x-PT) were prepared by mixed oxide method. Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature. The lattice parameter c/a ratio decreases with increasing of La(x = 0.05-0.20) concentration of the composites. The effect of charge carrier/ion hopping mechanism, conductivity, relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range (10 2-10 6 Hz) at different temperatures. The nature of Nyquist plot confirms the presence of bulk effects only, and non-Debye type of relaxation processes occurs in the composites. The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials. The ac conductivity and dc conductivity of the materials were studied, and the activation energy found to be 0.81, 0.77, 0.76 and 0.74 eV for all compositions of x = 0.05-0.20 at different temperatures (200-300°C).