M. H. Ghozza - Academia.edu (original) (raw)

Papers by M. H. Ghozza

Research paper thumbnail of Evaluation of radiation energy attenuation parameters of gamma rays and neutrons for La<SUB align="right">0.7Sr<SUB align="right">0.3MO<SUB align="right">3 (M = Fe, Mn, Co) nano perovskite compounds: a simulation study

International journal of power and energy conversion, 2024

Research paper thumbnail of Evaluation of radiation energy attenuation parameters of gamma rays and neutrons for La0.7Sr0.3MO3 (M = Fe, Mn, Co) nano perovskite compounds: a simulation study

International journal of power and energy conversion, 2024

Research paper thumbnail of Synthesis, Structure, Electrical Conductivity, and Band Structure of the Rare-Earth Copper Oxychalcogenide La5Cu6O4S7

Journal of Solid State Chemistry, 2000

The compound La 5 Cu 6 O 4 S 7 has been synthesized by the reaction of La 2 S 3 and CuO in a KI 6... more The compound La 5 Cu 6 O 4 S 7 has been synthesized by the reaction of La 2 S 3 and CuO in a KI 6ux at 1173 K. La 5 Cu 6 O 4 S 7 crystallizes in a new structure type in a cell of dimensions a ‫؍‬ 5.667(1), b ‫؍‬ 15.666(3), c ‫؍‬ 17.534(3) A > with four formula units in space group D 28 2h-Imma of the orthorhombic system at T ‫؍‬ 153 K. The structure comprises [Cu 2 S 2 ] anti6uorite-like and [La 10 S 2 O 8 ] 6uorite-like layers, and these two kinds of layers stack in turn along the [001] direction. The La atom is coordinated by a distorted square antiprism of four O and four S atoms, and the Cu atom is coordinated by a tetrahedron of four S atoms. The Cu atom in the [Cu 2 S 2 ] layer is bonded to neighboring Cu atoms; the Cu}Cu distances vary from 2.5864(7) to 2.965(1) A >. The average oxidation state of the Cu atoms is ؉7/6. La 5 Cu 6 O 4 S 7 is metallic in the [100] direction, consistent with the results of extended HuK ckel band structure calculation.

Research paper thumbnail of Synthesis and Characterization of Sr0.85Pb0.15Mn1−xSnxO3 Perovskite Manganite Nanostructures: Structural, Electrical, and Magnetic Properties

Journal of Electronic Materials

Research paper thumbnail of Impact of gadolinium doping on structure, electrical and magnetic properties of GdxCd1−xMnO3 manganite nanoparticles

Journal of Materials Science: Materials in Electronics, 2021

Nanocrystalline gadolinium-doped cadmium manganite having general formula Gd x Cd 1-x MnO 3 sinte... more Nanocrystalline gadolinium-doped cadmium manganite having general formula Gd x Cd 1-x MnO 3 sintered at 960°C for 10 h (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 and 0.7) were prepared by co-precipitation method. XRD, SEM, and EDS have characterized the structure of the studied material. Also, the DC electrical conductivity and magnetic properties are measured and analyzed. The effect of the MnO 6 octahedral structure on structural, electrical, and magnetic performance is investigated by doping of Gd-concentration and size misalignment of the A-sites cations by replacing Gd ions by Cd ions. With the pnma space group, all the samples have orthorhombic crystal structures. The range of crystallite sizes was 67.8 to 85 nm. SEM images showed that the average particle size within 73.23-214.3 nm for the studied samples. EDX demonstrates the presence of all the constituents of compounds. The variation in the DC conductivity above room temperature was studied and impressed with all compositions' semiconducting behavior. Moreover, the conductivity data were fitted using the small polaron hopping (SPH) model. The activation energy was calculated using the Arrhenius equation ranging from 0.18 to 0.46 eV. The magnetization curve (M-H) confirmed that the samples show paramagnetic behavior even at the high magnetic field. The Gd substitutions cause the increase average particle size and increase magnetization by 150%; on the contrary, it decreases the coercivity by 40%. The results suggest that using these compounds in potential oxygen sensor electrodes and resistive switching equipment is of interest. As applicants for biomedical applications, such benefits would also promise.

Research paper thumbnail of Role of B-site cation on the structure, magnetic and dielectric properties of nanosized La0.7Sr0.3Fe1−xMxO3 (M = Mn; Co and x = 0, 0.5) perovskites

Materials Research Express, 2020

The easiness of preparation and tailored properties of perovskite nanoparticles rendered them an ... more The easiness of preparation and tailored properties of perovskite nanoparticles rendered them an important class of materials in the last decade. In this work, La0.7Sr0.3Fe1-xMxO3 (M = Mn, Co and x = 0, 0.5) orthoferrites were synthesized using combustion method and examined using X-ray diffraction. The orthorhombic structure was clearly obvious with Pbnm space group without the need of any thermal treatment. Field emission scanning electron microscopy (FESEM) accompanied by Energy-dispersive spectroscopy studies were also performed, evidencing the similarity of both nominal and chemical compositions for the studied orthoferrites. The thermal dependence of the dielectric properties was investigated (from room temperature to 698 K) in the frequency range (70 Hz–5 MHz). Magnetic properties were investigated at room temperature and discussed.

Research paper thumbnail of Properties of 3d-4f oxides nanoparticles

For technological development, and to meet new demands of tomorrow's society, there is a cons... more For technological development, and to meet new demands of tomorrow's society, there is a constant need for new materials with new or improved properties. Recently, the perovskite-like rare-earth manganese compounds have been an intensive topic in scientific studies and potential technological application because of their charge and orbital ordering, magnetic phase transitions, colossal magnetoresistance CMR effect as well as magnetocaloric effect MCE. Potential applications of the CMR effect in mixed-valence manganites include magnetic sensors; magnetoresistive read heads; and magnetoresistive random access memory. Manganites play an important role as electrodes in solid oxide fuel cells and they may also be used for catalysis and in oxygen sensors as well as hydrogen storage. MCE effect has been applied widely for magnetic refrigeration technology. Perovskites with excellent dielectric properties at the microwave frequency have been used as dielectric resonators in wireless communication system. Nanoparticles materials can offer unprecedented interactions with biomolecules both on the surface and inside the cells, which may revolutionize cancer diagnosis and treatment.

Research paper thumbnail of Evaluation of radiation energy attenuation parameters of gamma rays and neutrons for La<SUB align="right">0.7Sr<SUB align="right">0.3MO<SUB align="right">3 (M = Fe, Mn, Co) nano perovskite compounds: a simulation study

International journal of power and energy conversion, 2024

Research paper thumbnail of Evaluation of radiation energy attenuation parameters of gamma rays and neutrons for La0.7Sr0.3MO3 (M = Fe, Mn, Co) nano perovskite compounds: a simulation study

International journal of power and energy conversion, 2024

Research paper thumbnail of Synthesis, Structure, Electrical Conductivity, and Band Structure of the Rare-Earth Copper Oxychalcogenide La5Cu6O4S7

Journal of Solid State Chemistry, 2000

The compound La 5 Cu 6 O 4 S 7 has been synthesized by the reaction of La 2 S 3 and CuO in a KI 6... more The compound La 5 Cu 6 O 4 S 7 has been synthesized by the reaction of La 2 S 3 and CuO in a KI 6ux at 1173 K. La 5 Cu 6 O 4 S 7 crystallizes in a new structure type in a cell of dimensions a ‫؍‬ 5.667(1), b ‫؍‬ 15.666(3), c ‫؍‬ 17.534(3) A > with four formula units in space group D 28 2h-Imma of the orthorhombic system at T ‫؍‬ 153 K. The structure comprises [Cu 2 S 2 ] anti6uorite-like and [La 10 S 2 O 8 ] 6uorite-like layers, and these two kinds of layers stack in turn along the [001] direction. The La atom is coordinated by a distorted square antiprism of four O and four S atoms, and the Cu atom is coordinated by a tetrahedron of four S atoms. The Cu atom in the [Cu 2 S 2 ] layer is bonded to neighboring Cu atoms; the Cu}Cu distances vary from 2.5864(7) to 2.965(1) A >. The average oxidation state of the Cu atoms is ؉7/6. La 5 Cu 6 O 4 S 7 is metallic in the [100] direction, consistent with the results of extended HuK ckel band structure calculation.

Research paper thumbnail of Synthesis and Characterization of Sr0.85Pb0.15Mn1−xSnxO3 Perovskite Manganite Nanostructures: Structural, Electrical, and Magnetic Properties

Journal of Electronic Materials

Research paper thumbnail of Impact of gadolinium doping on structure, electrical and magnetic properties of GdxCd1−xMnO3 manganite nanoparticles

Journal of Materials Science: Materials in Electronics, 2021

Nanocrystalline gadolinium-doped cadmium manganite having general formula Gd x Cd 1-x MnO 3 sinte... more Nanocrystalline gadolinium-doped cadmium manganite having general formula Gd x Cd 1-x MnO 3 sintered at 960°C for 10 h (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 and 0.7) were prepared by co-precipitation method. XRD, SEM, and EDS have characterized the structure of the studied material. Also, the DC electrical conductivity and magnetic properties are measured and analyzed. The effect of the MnO 6 octahedral structure on structural, electrical, and magnetic performance is investigated by doping of Gd-concentration and size misalignment of the A-sites cations by replacing Gd ions by Cd ions. With the pnma space group, all the samples have orthorhombic crystal structures. The range of crystallite sizes was 67.8 to 85 nm. SEM images showed that the average particle size within 73.23-214.3 nm for the studied samples. EDX demonstrates the presence of all the constituents of compounds. The variation in the DC conductivity above room temperature was studied and impressed with all compositions' semiconducting behavior. Moreover, the conductivity data were fitted using the small polaron hopping (SPH) model. The activation energy was calculated using the Arrhenius equation ranging from 0.18 to 0.46 eV. The magnetization curve (M-H) confirmed that the samples show paramagnetic behavior even at the high magnetic field. The Gd substitutions cause the increase average particle size and increase magnetization by 150%; on the contrary, it decreases the coercivity by 40%. The results suggest that using these compounds in potential oxygen sensor electrodes and resistive switching equipment is of interest. As applicants for biomedical applications, such benefits would also promise.

Research paper thumbnail of Role of B-site cation on the structure, magnetic and dielectric properties of nanosized La0.7Sr0.3Fe1−xMxO3 (M = Mn; Co and x = 0, 0.5) perovskites

Materials Research Express, 2020

The easiness of preparation and tailored properties of perovskite nanoparticles rendered them an ... more The easiness of preparation and tailored properties of perovskite nanoparticles rendered them an important class of materials in the last decade. In this work, La0.7Sr0.3Fe1-xMxO3 (M = Mn, Co and x = 0, 0.5) orthoferrites were synthesized using combustion method and examined using X-ray diffraction. The orthorhombic structure was clearly obvious with Pbnm space group without the need of any thermal treatment. Field emission scanning electron microscopy (FESEM) accompanied by Energy-dispersive spectroscopy studies were also performed, evidencing the similarity of both nominal and chemical compositions for the studied orthoferrites. The thermal dependence of the dielectric properties was investigated (from room temperature to 698 K) in the frequency range (70 Hz–5 MHz). Magnetic properties were investigated at room temperature and discussed.

Research paper thumbnail of Properties of 3d-4f oxides nanoparticles

For technological development, and to meet new demands of tomorrow's society, there is a cons... more For technological development, and to meet new demands of tomorrow's society, there is a constant need for new materials with new or improved properties. Recently, the perovskite-like rare-earth manganese compounds have been an intensive topic in scientific studies and potential technological application because of their charge and orbital ordering, magnetic phase transitions, colossal magnetoresistance CMR effect as well as magnetocaloric effect MCE. Potential applications of the CMR effect in mixed-valence manganites include magnetic sensors; magnetoresistive read heads; and magnetoresistive random access memory. Manganites play an important role as electrodes in solid oxide fuel cells and they may also be used for catalysis and in oxygen sensors as well as hydrogen storage. MCE effect has been applied widely for magnetic refrigeration technology. Perovskites with excellent dielectric properties at the microwave frequency have been used as dielectric resonators in wireless communication system. Nanoparticles materials can offer unprecedented interactions with biomolecules both on the surface and inside the cells, which may revolutionize cancer diagnosis and treatment.