Preparation by sol–gel method and characterization of Zn-doped LaCrO3 perovskite

Chadli, I.; Omari, Mahmoud; Dalo, Muna Abu; Albiss, B. A.

doi:10.1007/s10971-016-4170-5

Cited by 23 publications

(4 citation statements)

References 37 publications

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“…The lattice parameters calculated are in agreement with the reports. 20,21 The XRD characteristic peaks for both parents and their composites have been found to be intense which reveals highly crystalline nature of the samples while the narrowness of the FWHM of these main peaks suggests the larger values of the average crystallites. The average particle size has been calculated using classical Scherer's formula t ¼ 0:9λ=β cos θ, where t is the average crystallite size, k ¼ 0:9 is a constant (shape factor), λ is the wavelength of X-Rays used (1.5406 Å), θ is the angle of diffraction, β is the FWHM and the average particle size calculated are 44.41, 139.52, 44.052 and 43.123 nm for La 0:9 Na 0:1 CrO 3 , Ni 0:5 Cu 0:5 Fe 2 O 4 and their (1 À x) La 0:9 Na 0:1 CrO 3 þ ðxÞ Ni 0:5 Cu 0:5 Fe 2 O 4 (x ¼ 0:25, 0.50) samples, respectively.…”

Section: X-ray Diffractionmentioning

confidence: 97%

“…The average particle size has been calculated using classical Scherer's formula t ¼ 0:9λ=β cos θ, where t is the average crystallite size, k ¼ 0:9 is a constant (shape factor), λ is the wavelength of X-Rays used (1.5406 Å), θ is the angle of diffraction, β is the FWHM and the average particle size calculated are 44.41, 139.52, 44.052 and 43.123 nm for La 0:9 Na 0:1 CrO 3 , Ni 0:5 Cu 0:5 Fe 2 O 4 and their (1 À x) La 0:9 Na 0:1 CrO 3 þ ðxÞ Ni 0:5 Cu 0:5 Fe 2 O 4 (x ¼ 0:25, 0.50) samples, respectively. 20,22 From the XRD pattern, it is clear that the crystallinity has been reduced in composites compared to the comprising parent compounds inferred from diminished peak intensities. This means that the composites are porous in nature and are expected to exhibit the increased conductivity that will greatly influence the dielectric nature of the parent compounds.…”

Section: X-ray Diffractionmentioning

confidence: 99%

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Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

2019

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The preparation of [Formula: see text][Formula: see text]CrO3 (LNCO), [Formula: see text][Formula: see text]Fe2O4 (NCFO) and their composites of the type [Formula: see text] [Formula: see text][Formula: see text]CrO3 (LNCO) [Formula: see text] ([Formula: see text]) [Formula: see text][Formula: see text]Fe2O4 (NCFO) [Formula: see text], 0.50[Formula: see text] through solid state route is reported. From X-ray diffraction data analysis, the parent [Formula: see text][Formula: see text]CrO3 was found to crystallize in orthorhombic structure (Pnma) while [Formula: see text][Formula: see text]Fe2O4 has crystallized into the cubic structure (Fd3[Formula: see text]) further verified via Retvield refinement. The morphology and compositional studies were carried out using field emission scanning electron microscopy (FESEM) and energy dispersive analysis of X-rays (EDAX), respectively. Lattice structure was confirmed via Raman characterization for the prepared samples. The sample formation was further verified through Fourier transform Infra-Red (FTIR) spectroscopy. The dielectric studies reveal the [Formula: see text][Formula: see text]CrO3[Formula: see text] and [Formula: see text][Formula: see text]Fe2O4[Formula: see text] exhibit high dielectric constant. However, their composites show abrupt drop in dielectric constant. The electric modulus study confirmed that the samples exhibit non-Debye character with spread of relaxation time constants.

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Section: X-ray Diffractionmentioning

confidence: 97%

Section: X-ray Diffractionmentioning

confidence: 99%

Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

2019

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“…Metal oxides are a large class of compounds [1][2][3]. They have been studied for a few years for variety of applications because of their electrical and/or magnetic properties extraordinary.…”

Section: Introductionmentioning

confidence: 99%

Structural and Anisotropic Elastic Properties of Hexagonal YMnO<sub>3</sub> in Low Symmetry Determined by First-Principles Calculations

Chadli

Halit

Lagoun

et al. 2019

SSP

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The structural, elastic and anisotropic properties for rare earth manganites compound YMnO3 in ferromagnetic state with hexagonal structure, have been investigated using the ab initio calculations based on the density functional theory, this calculations were based on the full potential linearized augmented plane wave (FP-LAPW) method with the generalized gradient approximation (GGA). The agreement of the DFT (FP-LAPW) calculations including internal atomic relaxations, with the experimental data is very good. Other relevant quantities such as elastic constants, shear modulus, Young’s modulus, Poisson’s ratio, anisotropy factors, sound velocity, and Debye temperature have been calculated and discussed.

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“…Several compounds that have been tested as modifying agents are citric acid 44,45 , glycine nitrate 46 , and ammonium carbonate 47 . In general, it was reported that the use of modifier in sol-gel process resulted in better characteristics of solid products, compared to those of the products produced without modifier, such as more homogeneous surface, smaller particle size, and narrower particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Nano-Size LaCrO3 Prepared Through Sol-Gel Route Using Pectin as Emulsifying Agent

Situmeang¹,

Supryanto²,

Kahar³

et al. 2017

Orient. J. Chem

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In this study, nano-size LaCrO 3 was prepared through sol-gel route using pectin as emulsifying agent, followed by freeze -drying to obtain solid sample. The sample was prepared by mixing the solution of La(NO 3 ) 3 .6 H 2 O and Cr(NO 3 ) 3 .9 H 2 O with pectin solution under magnetic stirring. The sample was frozen and subsequently subjected to freeze -drying and calcination treatment at temperatures of 600, 700 and 800 ºC for 6 h. The calcined samples were characterized with several techniques. The phase composition was evaluated using the X-ray diffraction (XRD) technique, followed by crystallite size calculation using Scherrer Methods. The functionality of sample was identified using Fourier transform infrared (FTIR) spectroscopy, surface structure in three dimensional images was analyzed using Transmission electron microscopy (TEM), and particle size distribution was determined by Particles Size Distribution (PSA). The results of XRD characterization indicated that materials consist of various crystalline phases, with LaCrO 3 as a major phase. FTIR Analysis revealed the existence of both Lewis and BrØnsted -Lowry acid sites, with Lewis acid as the prominent sites, represented by the absorption band located at around 1636 cm -1 . The samples were found to display relatively homogeneous surface morphology, having the crystallite size in the range of 24 to 25 nm according to Scherrer equation. The PSA analyses revealed increased relative percentages of nano-size portion in the sample from 22 to 89% as temperatures increased from 600 to 800 ºC, with the particle size in the range of 30 to 35 nm as seen by the TEM .

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Preparation by sol–gel method and characterization of Zn-doped LaCrO3 perovskite

Cited by 23 publications

References 37 publications

Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

Structural and Anisotropic Elastic Properties of Hexagonal YMnO<sub>3</sub> in Low Symmetry Determined by First-Principles Calculations

Characteristics of Nano-Size LaCrO3 Prepared Through Sol-Gel Route Using Pectin as Emulsifying Agent

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Preparation by sol–gel method and characterization of Zn-doped LaCrO3 perovskite

Cited by 23 publications

References 37 publications

Study of structural and dielectric properties of La0.9Na0.1CrO3- and Ni0.5Cu0.5Fe2O4-based composites

Study of structural and dielectric properties of La0.9Na0.1CrO3- and Ni0.5Cu0.5Fe2O4-based composites

Structural and Anisotropic Elastic Properties of Hexagonal YMnO<sub>3</sub> in Low Symmetry Determined by First-Principles Calculations

Characteristics of Nano-Size LaCrO3 Prepared Through Sol-Gel Route Using Pectin as Emulsifying Agent

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Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites