Effect of sintering on formation, structure, magnetic and dielectric properties of nanocrystalline La0.1Ca0.9MnO3 perovskite

Allah, T.M. Abd; Elfalaky, A.; Ghozza, M. H.

doi:10.1016/j.mseb.2022.115749

Cited by 4 publications

(5 citation statements)

References 31 publications

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“…The XRD patterns reveals the broadening of the reflected peaks. Such broadening indicates that the crystallites are in nano size [36]. The FullProf Suite program's precise Rietveld analysis revealed that all specimens have a single-phase spinel cubic with space group Fd-3m.…”

Section: Resultsmentioning

confidence: 99%

The correlation between structure and magneto optical properties of nanostructured Magnesium ferrites upon Molybdenum doping for magnetic and optoelectronic applicability

Desoky¹,

Allah²

2022

Phys. Scr.

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Nano-ferrite MgMoxFe2-xO4 (x= 0.0, 0.05, 0.15, and 0.3)were synthesized employing citrate sol-gel auto combustion methodology. X-ray diffraction (XRD) reveals the crystal structure of the prepared samples., XRD scrutiny disclosed a single cubic spinel phase for all specimens. Furthermore, the Rietveld analysis based on structure refinement used to determine the microstructural parameters and evaluate the cation distribution. The findings showed that the average crystallite size was ~39 nm, while the lattice constant “a” increases with increasing Mo concentrations attributable to introducing Mo+6 to supplant Fe+3. The magnetic properties were investigated utilizing VSM magnetometer. The saturation magnetization (Ms) descends with escalating Mo+6 replacement. Consequently, both Rietveld scrutiny and saturation magnetization (Ms) results suggest that the Mo+6 supplanted Fe+3 in octahedral B-locations. On the other hand, reflectance and transmittance were used in optical properties to calculate the refractive index, n, and the extinction coefficient, k. The parameters of optical properties such as infinity, lattice and relaxation time of dielectric constant were estimated. In addition, complex optical conductivity, optical electronegativity and optical transitions of all studied samples were assessed. Finally, the parameters of opto-electrical application, such as the concentration, mobility and resistivity of optical carrier were appraised.

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Section: Resultsmentioning

confidence: 99%

The correlation between structure and magneto optical properties of nanostructured Magnesium ferrites upon Molybdenum doping for magnetic and optoelectronic applicability

Desoky¹,

Allah²

2022

Phys. Scr.

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“…2.1. Preparation and characterization of MgMo x Fe 2-x O 4 nanocrystalline ferrite MgMo x Fe 2-x O 4 nanocrystalline ferrite (where x = 0.0, 0.05, 0.1, 0.15, and 0.3) was synthesized following the routine in our early paper using the auto-combustion method [19][20][21]. The crystal and chemical structure of obtained samples were investigated using XRD (PANalytical) FTIR (PerkinElmer 887), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…A, E a and k B are the pre-exponential factor, the activation energy, and the Boltzmann constant, respectively [20,21] Beer-Lambert law…”

Section: Electrical Propertiesmentioning

confidence: 99%

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Dielectric, conductivity properties, elastic moduli, and gamma-ray attenuation abilities: A wide-ranging investigation into Molybdenum added ferrite nanoparticles

Desoky,

Allah,

Mansy

2023

Phys. Scr.

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The auto combustion technique was employed to synthesis magnesium nano ferrite (MgMoxFe2-xO4). The impact of Mo-doped on the crystal’s structural, morphological, and elastic properties were inspected by applying x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy techniques. Pursuant to the XRD analysis, all samples have a cubic structure with single-phase. The average crystallite size was identified to be in the nanometer range confirmed by SEM and TEM investigations. FTIR data was implemented to assign the force constants of the octahedral and tetrahedral sites. Elastic moduli including the Poisson ratio, Young’s modulus, bulk modulus, and rigidity modulus have been estimated. The division of elastic moduli for all synthesized concentrations was interpreted using binding forces between ions of the cubic lattice spinel. Over and above, the AC conductivity (σ AC) and dielectric properties and their frequency dependence were investigated for the nano ferrites samples as a function of dopant Mo content and temperature. Finally, the radiation shielding capacities of the proposed samples against gamma and fast neutron radiation have been assessed. The findings reveal that the higher the Mo content, the lower the value of the mass attenuation coefficient. There is no significant diversity between the obtained mass attenuation coefficients for the nano and the micro. Among the samples investigated in this study, the highest Mo concentration sample had the largest fast neutron removal cross-section.

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“…Since the discovery of the phenomenon of colossal magnetoresistance (CMR) within the La1-xAxMnO3 (A = Sr, Ca, Ba) framework, researchers have conducted extensive investigate on perovskite doped with alkaline earth elements [5]- [8]. In expansion to a crucial understanding of the instrument of the CMR impact, studies have moreover been persuaded by the potential applications of these materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Magnetic and Electrical Transport Properties of Sol-Gel Synthesized La0.7Sr0.2Ca0.1MnO3:TiO2 Composite

Zulkarnain

Kurniawan

Imaduddin³

et al. 2023

SSP

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Electrical transport in materials have been studied extensively due to its great potential in spintronic technology. The introduction of the secondary phase into the manganite matrix can modify the electrical properties, subsequently improving the low-field magnetic resistance (LFMR). In this work, we study the change in electrical properties at different temperatures of polycrystalline (1-x)La0.7Sr0.2Ca0.1MnO3/xTiO2 (LT) composites where x = 0, 0.05 and 0.1. Polycrystalline La0.7Sr0.2Ca0.1MnO3 (LSCMO) was synthesized by sol-gel method, calcined at 700 °C, and pre-sintered at 800 °C for 6 h before adding TiO2. TiO2 as filler was mixed with LSCMO by wet mixing and stirring for about 30 min until a homogeneous compound was formed. Composite LT was then inserted to oven up to 100 °C for 2h to remove the moisture, compacted at 10 MPa, and sintered at 1200°C for 12 h. All samples in the LSCMO phase have a rhombohedral crystal structure with space group R3c. The crystal structure parameters were studied using Rietveld refinement through GSAS II software. The sample was characterized by SEM to represent the morphology of the sample. As the TiO2 content increased, the magnetization decreased, as observed by VSM analysis at room temperature. The electrical transport properties of pure LSCMO and LT were characterized by cryogenic from 195K to 260 K. The resistivity of LT10 is too high compared to that of LT5 and as the temperature increases, the resistivity in this range will decrease. For 200 K, the resistivity of LSCMO, LT5 and LT10 are 3.09 x 10-2 ohm.cm, 4.40 x 103 ohm.cm and 4.77 x 104 ohm.cm respectively.

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Effect of sintering on formation, structure, magnetic and dielectric properties of nanocrystalline La0.1Ca0.9MnO3 perovskite

Cited by 4 publications

References 31 publications

The correlation between structure and magneto optical properties of nanostructured Magnesium ferrites upon Molybdenum doping for magnetic and optoelectronic applicability

The correlation between structure and magneto optical properties of nanostructured Magnesium ferrites upon Molybdenum doping for magnetic and optoelectronic applicability

Dielectric, conductivity properties, elastic moduli, and gamma-ray attenuation abilities: A wide-ranging investigation into Molybdenum added ferrite nanoparticles

Microstructure, Magnetic and Electrical Transport Properties of Sol-Gel Synthesized La<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>MnO<sub>3</sub>:TiO<sub>2</sub> Composite

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