Structural, magnetic and electrical properties of Bi doped LaFeO3 nano-crystals, synthesized by auto-combustion method

Ahmed, Mohamed; Azab, A. A.; El-Khawas, E. H.

doi:10.1007/s10854-015-3556-4

Cited by 39 publications

(16 citation statements)

References 46 publications

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“…The parent compounds of the nanocomposites namely, La 0.90 Bi 0.10 Fe 2 O 3 (LBFO) and Cu o.3 Mn 0.7 Fe 2 O 4 (CMFO) were prepared using the sol-gel auto-combustion method as reported earlier [33][34][35]. The nanocomposites (NCs) were prepared from the LBFO and CMFO in four different weight ratios according to the formula: (x)CMFO-(1-x)LBFO, where x = 0, 0.2, 0.4, 0.6, 0.8 and 1.…”

Section: Experimental Work Preparation Of Samplesmentioning

confidence: 99%

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The effect of the interface on magnetic properties of perovskite-spinel nanocomposites

El-Khawas

2019

Arab Journal of Nuclear Sciences and Applications

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In this research, perovskite-spinel nanocomposites (of the synthsiesed formula (x)(Cu o.3 Mn 0.7 Fe 2 O 4 )-(1x)(La 0.9o Bi 0.10 FeO 3 ); 0 ≤ x ≤ 1, were prepared using the auto-combustion method. The fundamental phases of orthorhombic for (La0.9oBi0.10FeO3(LBFO) and the cubic phases for Cuo.3Mn0.7Fe2O4(CMFO) were demonstrated utilizing X-Ray Diffractometry (XRD) analysis.. Highresolution transmission electron microscopy (HRTEM) images reveal nearly spherical nanoparticles for the parents compositions and agglomeratation for nanocomposites. Magnetic hysteresis loops demonstrate ferromagnetic (FM) behavior for the spinel compound and nanocomposite, where LBFO possesses G-type antiferromagnetic (AFM). Competition between FM and AFM phases leads to enhancement in magnetic parameters such as saturation magnetization (Ms), remnant magnetization (Mr) and coercivity (Hc). The magnetic properties at low temperatures show a decrease in the magnetization and coercivity with increasing the temperature while the magnetic exchange bias H EB increased until T=200 K and then, decreased. The intergranular magnetostatics interactions have promoted along the LBFO and CMFO nanocomposites interfaces which play a decisive role in strain energy, exchange energy, and magnetic anisotropy.

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Section: Experimental Work Preparation Of Samplesmentioning

confidence: 99%

“…x Bi x FeO 3 (LBFO) and Mn 1-x Cu x Fe 2 O 4 (CMFO) were synthesized by auto combustion method [33]. The magnetic properties demonstrated that the concentration La 0.9 Bi 0.1 FeO 3 and Mn 0.7 Cu 0.3 Fe 2 O 4 have the maximum value of magnetization.…”

Section: Introductionmentioning

confidence: 99%

The effect of the interface on magnetic properties of perovskite-spinel nanocomposites

El-Khawas

2019

Arab Journal of Nuclear Sciences and Applications

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“…ε' and σ ac decreased with increases in the Bi content up to 10% and then increased. The authors suggested that the La 0.9 Bi 0.1 FeO 3 compound is promising for its electric properties [10]. Other studies have paid attention to Al 3+ -substituted LaFeO 3 .…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of calcium-substituted lanthanum ferrite

Andoulsi-Fezei

Sdiri

Horchani−Naifer

et al. 2020

Journal of Asian Ceramic Societies

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Among La 1-x Ca x FeO 3-δ (0 ≤ x ≤ 0.5) compounds, the optimal value of the direct current conductivity was registered for a 20% substituted amount. We therefore attempted to study the impedance and dielectric properties of 20% calcium-substituted lanthanum ferrite. We investigated the electric properties in depth between 5 Hz and 13 MHz from 350 to 800°C. The results reveal interesting properties. Indeed, the perovskite shows a huge dielectric constant which promotes its utilization in high-performance dielectric material applications. At a given temperature, ε' and tan(δ) decrease with increases in frequency. This trend was explained based on the Maxwell Wagner polarization model. The variations in dielectric loss (ε") with frequency obey the Giuntini theory based on the hopping model. As the temperature increases from 350 to 800°C, the binding energy increases from 0.22 to 0.34 eV, while the minimum hopping distance decreases from 2.16 to 0.12 pm. Consideration of the electric modulus analyzes showed that the relaxation mechanism is dominated at below 400°C by a shortrange movement of charge carriers, whereas at above that temperature, a long-range movement of charge carriers is dominant. This study presents a solid foundation for the polarization and dielectric properties of lanthanum ferrite, which is a lead-free, environmentally friendly material and a promising candidate for use in nonlinear optical applications and microwave devices.

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“…[10][11][12][13] Whether aiming to produce LaMO 3 perovskite-type oxide powders or to synthesize films, many diverse low-temperature chemical routes have been investigated such as molten salt synthesis, [14][15][16][17][18] the solgel route, [19][20][21][22] co-precipitation of hydroxides, [23][24][25] thermal decomposition of heteronuclearcyano metal complexes (CN method), [26][27][28][29][30][31][32] microwave-assisted synthesis, [30,33,34] solution combustion synthesis [35][36][37] and solid-state combustion synthesis (SSC). [21,31,[38][39][40] Among these, we focus on the SSC using a heteronuclearcyano complex precursor. On the one hand, SSC is one of the methods with the lowest thermal budget because it takes advantage of the heat released by an exothermic reaction for the synthesis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of LaFeO3 perovskite-type oxide via solid-state combustion of a cyano complex precursor: The effect of oxygen diffusion

Sánchez-Rodríguez

Wada

Yamaguchi

et al. 2017

Ceramics International

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The effect of oxygen diffusion on the thermal decomposition kinetics of La[Fe(CN)6]·5H2O has been explored. In particular, the critical conditions under which LaFeO3 can be synthesized via solid-state combustion of this cyano complex precursor were analytically and numerically investigated. Thermal analysis experiments as well as simulations showed that the oxygen diffusion enhancement facilitates the formation of a self-propagating combustion front during the decomposition of La[Fe(CN)6]·5H2O. As a consequence, the sample undergoes local overheating that raises its temperature by several hundreds of degrees. This enables the production of LaFeO3 perovskite-type oxide with a minimum contribution of external heat resources. Although the self-propagating high-temperature method has already proven to be successful for the synthesis of perovskite-type oxides from cyano complex precursors under oxygen atmosphere, we will show that under the appropriate settings, air can be used instead. Moreover, the temperature of the front is related to the ease of oxygen diffusion. Therefore, the surface area and the crystal size of LaFeO3 perovskite-type powders obtained via solid state combustion have been controlled by controlling the gas flow rate at which the sample has been exposed during the treatmen

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Structural, magnetic and electrical properties of Bi doped LaFeO3 nano-crystals, synthesized by auto-combustion method

Cited by 39 publications

References 46 publications

The effect of the interface on magnetic properties of perovskite-spinel nanocomposites

The effect of the interface on magnetic properties of perovskite-spinel nanocomposites

Dielectric properties of calcium-substituted lanthanum ferrite

Synthesis of LaFeO3 perovskite-type oxide via solid-state combustion of a cyano complex precursor: The effect of oxygen diffusion

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