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Papers by Asghari Maqsood

Research paper thumbnail of ZnTe Thin Films Prepared by Two Source Evaporation Method

Research paper thumbnail of Structural and microwave absorption properties of Ni(1-x)Co(x)Fe2O4

Research paper thumbnail of Acoustic Properties of Ho2Si2O7 Single Crystal Investigated by Brillouin Light Scattering

Key Engineering Materials, May 22, 2012

ABSTRACT

Research paper thumbnail of Prediction of effective thermal conductivity of consolidated porous materials under ambient conditions

Indian Journal of Physics, Mar 14, 2014

Research paper thumbnail of Preparation and characterization of superconducting material in the Ho-Ba-Cu-O system

Research paper thumbnail of Influence of sintering time on the structural, electrical and magnetic properties of polycrystalline Cu0.6Zn0.4Fe2O4 ferrites

Journal of Alloys and Compounds, Oct 1, 2010

Research paper thumbnail of Influence of sintering time on structural, magnetic and electrical properties of Si Ca added Sr-hexa ferrites

Journal of Magnetism and Magnetic Materials, Sep 1, 2007

Sr-hexa ferrites with the addition of Si (0.5 wt%) and Ca (0.5 wt%) have been prepared by solid-s... more Sr-hexa ferrites with the addition of Si (0.5 wt%) and Ca (0.5 wt%) have been prepared by solid-state reaction method with sintering time variation ranging from 2 to 10 h. The structural characterization of the samples confirmed the major phase of Sr-hexa ferrite. Average grain size was found within the range of 1-4 μm. Vicker hardness increased from 512 to 1187 Hv. The coercivity and remanence had the ranges from 596 to 4255 Oe and 324 to 516 G, respectively. The DC electrical resistivity measurements were carried out by two-probe method as a function of temperature from 303 to 723 K. The room temperature DC resistivity increased from 1.67×10 6 to 2.89×10 8 Ω cm in turn the activation energy also increased from 0.314 to 0.495 eV. The DC electrical resistivity decreased while drift mobility increased with the rise in temperature, ensuring the semi-conducting behavior. Dielectric properties were studied as a function of frequency in the range of 80 Hz to 1 MHz at room temperature.

Research paper thumbnail of Thermal Conductivity and Thermoelectric Power of Vanadium-Substituted Bi-Based (2223) High-Tc Superconductor as a Function of Temperature

Journal of Superconductivity and Novel Magnetism, 2008

ABSTRACT Superconducting samples with nominal composition Bi1.3V0.3Pb0.4Sr2Ca2Cu3O δ are prepared... more ABSTRACT Superconducting samples with nominal composition Bi1.3V0.3Pb0.4Sr2Ca2Cu3O δ are prepared by the solid state reaction method. The samples are characterized by X-ray diffraction, scanning electron microscopy, DC electrical resistivity, critical current density, AC magnetic susceptibility, thermal conductivity and thermoelectric measurements. The room temperature X-ray diffraction pattern of the sample indicated the presence of large amount of Bi-(2223) phase along with minor amount of Bi-(2212) phase. The standard four-probe technique is applied to measure DC electrical resistivity in the temperature range from 300 to 77 K. The onset temperature T c (onset) and zero resistivity critical temperature T c (R=0) are found to be 112±1 K and 106±1 K, respectively. The low field AC magnetic susceptibility is also measured as a function of temperature. Thermal conductivity and thermoelectric power of large disc-shaped cylindrical samples are measured as a function of temperature from 300 to 77 K. The increase in thermal conductivity is observed below and above T c (R=0). The estimation of the resistivity change due to scattering by phonons and impurities has been discussed.

Research paper thumbnail of Thermal Stability of Fe85.5B14.5 Metallic Glass

Research paper thumbnail of Growth kinetics of Cu 1− x Tl x Ba 2Ca 2Cu 3O 10− y thin films

Research paper thumbnail of Sintering effects on structure, morphology, and electrical properties of sol-gel synthesized, nano-crystalline erbium oxide

Electronic Materials Letters, 2012

Research paper thumbnail of Modeling of the Effective Thermal Conductivity of Consolidated Porous Media with Different Saturants: A Test Case of Gabbro Rocks

Research paper thumbnail of Prediction of effective thermal conductivity of porous consolidated media as a function of temperature: a test example of limestones

Research paper thumbnail of Modeling of the effective thermal conductivity of composite materials with FEM based on resistor networks approach

Research paper thumbnail of Modeling of Effective Thermal Conductivity of Dunite Rocks as a Function of Temperature

Research paper thumbnail of Structural and microwave absorption properties of Ni(1−x)Co(x)Fe2O4 (0.0 ≤ x ≤ 0.5) nanoferrites synthesized via co-precipitation route

Journal of Alloys and Compounds

Research paper thumbnail of Determination of thickness

Research paper thumbnail of Effects of MOSFET mismatch on the performance of single supply low voltage operational amplifiers

Microelectronics International, 2005

ABSTRACT

Research paper thumbnail of ZnTe Thin Films Prepared by Two Source Evaporation Method

Research paper thumbnail of Structural, optical and electrical characterization of HgxCd1-xTe polycrystalline films fabricated by two-source evaporation technique

Crystal Research and Technology

Two-source thermal evaporation technique was used to prepare HgxCd1-xTe thin films onto scratch f... more Two-source thermal evaporation technique was used to prepare HgxCd1-xTe thin films onto scratch free transparent glass substrates. The structural investigations revealed that thin films were polycrystalline in nature. Transmittance measurements in the wavelength range (500-2700 nm) were used to calculate optical constants. The analysis of the optical absorption data showed that the optical band gap was of indirect type. In the composition range 0.05< x < 0.25 the films exhibited an optical band gap between 1.29 and 0.98 eV. In the same composition range the films were p-type and exhibited a resistivity, which varied between 102 and 10-1 Ω-cm.

Research paper thumbnail of ZnTe Thin Films Prepared by Two Source Evaporation Method

Research paper thumbnail of Structural and microwave absorption properties of Ni(1-x)Co(x)Fe2O4

Research paper thumbnail of Acoustic Properties of Ho2Si2O7 Single Crystal Investigated by Brillouin Light Scattering

Key Engineering Materials, May 22, 2012

ABSTRACT

Research paper thumbnail of Prediction of effective thermal conductivity of consolidated porous materials under ambient conditions

Indian Journal of Physics, Mar 14, 2014

Research paper thumbnail of Preparation and characterization of superconducting material in the Ho-Ba-Cu-O system

Research paper thumbnail of Influence of sintering time on the structural, electrical and magnetic properties of polycrystalline Cu0.6Zn0.4Fe2O4 ferrites

Journal of Alloys and Compounds, Oct 1, 2010

Research paper thumbnail of Influence of sintering time on structural, magnetic and electrical properties of Si Ca added Sr-hexa ferrites

Journal of Magnetism and Magnetic Materials, Sep 1, 2007

Sr-hexa ferrites with the addition of Si (0.5 wt%) and Ca (0.5 wt%) have been prepared by solid-s... more Sr-hexa ferrites with the addition of Si (0.5 wt%) and Ca (0.5 wt%) have been prepared by solid-state reaction method with sintering time variation ranging from 2 to 10 h. The structural characterization of the samples confirmed the major phase of Sr-hexa ferrite. Average grain size was found within the range of 1-4 μm. Vicker hardness increased from 512 to 1187 Hv. The coercivity and remanence had the ranges from 596 to 4255 Oe and 324 to 516 G, respectively. The DC electrical resistivity measurements were carried out by two-probe method as a function of temperature from 303 to 723 K. The room temperature DC resistivity increased from 1.67×10 6 to 2.89×10 8 Ω cm in turn the activation energy also increased from 0.314 to 0.495 eV. The DC electrical resistivity decreased while drift mobility increased with the rise in temperature, ensuring the semi-conducting behavior. Dielectric properties were studied as a function of frequency in the range of 80 Hz to 1 MHz at room temperature.

Research paper thumbnail of Thermal Conductivity and Thermoelectric Power of Vanadium-Substituted Bi-Based (2223) High-Tc Superconductor as a Function of Temperature

Journal of Superconductivity and Novel Magnetism, 2008

ABSTRACT Superconducting samples with nominal composition Bi1.3V0.3Pb0.4Sr2Ca2Cu3O δ are prepared... more ABSTRACT Superconducting samples with nominal composition Bi1.3V0.3Pb0.4Sr2Ca2Cu3O δ are prepared by the solid state reaction method. The samples are characterized by X-ray diffraction, scanning electron microscopy, DC electrical resistivity, critical current density, AC magnetic susceptibility, thermal conductivity and thermoelectric measurements. The room temperature X-ray diffraction pattern of the sample indicated the presence of large amount of Bi-(2223) phase along with minor amount of Bi-(2212) phase. The standard four-probe technique is applied to measure DC electrical resistivity in the temperature range from 300 to 77 K. The onset temperature T c (onset) and zero resistivity critical temperature T c (R=0) are found to be 112±1 K and 106±1 K, respectively. The low field AC magnetic susceptibility is also measured as a function of temperature. Thermal conductivity and thermoelectric power of large disc-shaped cylindrical samples are measured as a function of temperature from 300 to 77 K. The increase in thermal conductivity is observed below and above T c (R=0). The estimation of the resistivity change due to scattering by phonons and impurities has been discussed.

Research paper thumbnail of Thermal Stability of Fe85.5B14.5 Metallic Glass

Research paper thumbnail of Growth kinetics of Cu 1− x Tl x Ba 2Ca 2Cu 3O 10− y thin films

Research paper thumbnail of Sintering effects on structure, morphology, and electrical properties of sol-gel synthesized, nano-crystalline erbium oxide

Electronic Materials Letters, 2012

Research paper thumbnail of Modeling of the Effective Thermal Conductivity of Consolidated Porous Media with Different Saturants: A Test Case of Gabbro Rocks

Research paper thumbnail of Prediction of effective thermal conductivity of porous consolidated media as a function of temperature: a test example of limestones

Research paper thumbnail of Modeling of the effective thermal conductivity of composite materials with FEM based on resistor networks approach

Research paper thumbnail of Modeling of Effective Thermal Conductivity of Dunite Rocks as a Function of Temperature

Research paper thumbnail of Structural and microwave absorption properties of Ni(1−x)Co(x)Fe2O4 (0.0 ≤ x ≤ 0.5) nanoferrites synthesized via co-precipitation route

Journal of Alloys and Compounds

Research paper thumbnail of Determination of thickness

Research paper thumbnail of Effects of MOSFET mismatch on the performance of single supply low voltage operational amplifiers

Microelectronics International, 2005

ABSTRACT

Research paper thumbnail of ZnTe Thin Films Prepared by Two Source Evaporation Method

Research paper thumbnail of Structural, optical and electrical characterization of HgxCd1-xTe polycrystalline films fabricated by two-source evaporation technique

Crystal Research and Technology

Two-source thermal evaporation technique was used to prepare HgxCd1-xTe thin films onto scratch f... more Two-source thermal evaporation technique was used to prepare HgxCd1-xTe thin films onto scratch free transparent glass substrates. The structural investigations revealed that thin films were polycrystalline in nature. Transmittance measurements in the wavelength range (500-2700 nm) were used to calculate optical constants. The analysis of the optical absorption data showed that the optical band gap was of indirect type. In the composition range 0.05< x < 0.25 the films exhibited an optical band gap between 1.29 and 0.98 eV. In the same composition range the films were p-type and exhibited a resistivity, which varied between 102 and 10-1 Ω-cm.

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