Effect of Ca substitution on structural, magnetic and dielectric properties of BiFeO<sub>3</sub>

Thakur, Samita; Pandey, O.P.; Singh, K.

doi:10.1080/01411594.2013.879477

Cited by 17 publications

(7 citation statements)

References 26 publications

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“…The Raman bands in the range 180-300 cm −1 correspond to tilt modes of InO 6 [19]. Similar types of tilt in FeO 6 octahedra have been reported by Thakur et al [20] for BiFeO 3 system. The spectral band at 200 cm −1 is due to InO 6 tilt/bending mode of InO 6 octahera [21].…”

Section: Raman Spectrasupporting

confidence: 57%

Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties

Sood

Singh

Basu

et al. 2015

Ionics

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Ca-doped LaInO 3 (LCI) has been synthesized by conventional solid-state reaction method. The structural features were investigated by X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The structural investigation indicated that Ca 2+ dopants occupy both A-and B-sites in ABO 3 (La 1-x In x O 3-δ ). The solid solubility limit has been observed up to x = 0.10 for La 1-x Ca x InO 3-δ system. In addition, the Raman band softening has been observed with Ca-doping. The impedance spectroscopy shows that 10 mol% of Ca-doped LaInO 3 possesses the highest conductivity of the order of 1.64 mS cm −1 at 700°C among all investigated samples. The activation energy of doped samples lies within the range of 0.69-0.86 eV, which indicates that the conductivity in the reported samples is mainly contributed by ion transportation. SEM analysis supports the well-packed grains in the sintered samples.

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Section: Raman Spectrasupporting

confidence: 57%

Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties

Sood

Singh

Basu

et al. 2015

Ionics

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“…According to the variation of the magnetic parameters shown in Figure 10, the residual magnetization ( M r ) and the coercive force ( H c ) decrease linearly with the increase of the x value due to the increase of Ca 2+ resulting in magnetocrystalline anisotropy. 31 The effect of Ca 2+ substitution at Bi 3+ sites causes the valence change of Fe and/or the oxygen vacancies. 32 However, the saturation magnetizations ( M s ) are increasing with the x value.…”

Section: Resultsmentioning

confidence: 99%

“…Its value is not only affected by temperature ( T ), but also by frequency ( F ). Many studies, such as Thakur et al 31 and Yotburut et al, 26 have reported that the dielectric constant varies with frequency in the low-frequency range. They have studied the dielectric constant ε′, which varies with frequency within the range 10 2 ~10 6 H Z .…”

Section: Resultsmentioning

confidence: 99%

Magnetic and dielectric properties of Ca-substituted BiFeO₃ nanoferrites by the sol-gel method

Lin

Guo

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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Background: A multiferroic material can simultaneously show two or more basic magnetic properties, including ferromagnetism, antiferromagnetism, and ferroelectricity. BiFeO 3 is a multiferroic material with a rhombohedral distorted perovskite structure. Doping can reduce the volatility of Bi and greatly improve the magnetoelectric properties of BiFeO 3 . Methods: To investigate the influence of the doping content we used the following analytical methods: X-ray powder diffraction (XRD), scanning electron microscopy (SEM), microwave network analysis (PNA-N5244A), and the Superconducting Quantum Interference Device (Quantum Design MPMS) test. Results: With the increase of Ca 2+ concentration in the solution, the grain size of Bi 1-x Ca x FeO 3 becomes smaller, showing the role of Ca 2+ ions as the dopant for fine grains. The calcination temperatures are the major causes for the saturated magnetization. The residual magnetization (M r ) and the coercive force (H c ) decrease linearly with the increase of x value, and due to the effect of Ca 2+ substitution at Bi 3+ sites, which causes the valence change of Fe and/or the oxygen vacancies. Conclusions:The XRD result indicates that the diffraction peak emerges with the increase of Ca 2+ and the main diffraction peak achieves a high angle. The best calcining temperature is 600 °C, and the morphology is very dependent on the calcining temperature.

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“…This causes the decline in magnetization with x = 0.06 and further modification towards pure paramagnetic state given in Fig. 5 [39]. Moreover, Sn 4+ ions change the bond length and angle of Bi-O-Fe and Bi-O, which leads to variation in magnetic properties [40].…”

Section: Vsmmentioning

confidence: 95%

Structural, Magnetic, and Dielectric Properties of Sn-Doped BiFeO3: Experiment and DFT Analysis

Farid

Murtaza

Flemban

et al. 2021

J Supercond Nov Magn

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The structural, magnetic, dielectric, and surface morphology of BiSn x Fe 1-x O 3 (x = 0.0 to 1.0) was analyzed experimentally. The samples were synthesized by a simple chemical micro-emulsion method. The X-ray diffraction (XRD) analysis reveals structural distortion at A site and B site of BFO due to Sn doping in rhombohedral phase. The EDX data certify Sn is well incorporated in BiFeO 3 . The effect of Sn doping on crystal size and grain size has also been addressed. The FTIR analysis elaborates absorption at 555 cm −1 which is due to stretching and bending vibrations of O-Fe-O bonds. The magnetic properties are illustrated by vibrating sample magnetometer (VSM). The magnetic moments and exchange mechanism described theoretically by DFT analysis which support the experimental results. The dielectric behavior of studied materials has been evaluated by dielectric constant (ɛʹ), tangent loss (tanδ), real and imaginary part of impedance, and Cole-Cole plots in 1-3 GHz. The spin-orientated magnetism and dielectric response increase their potential for microwave absorber and sensor.Keywords Room temperature ferromagnetism • Micro-emulsion method • Vibrating sample magnetometer * Q. Mahmood

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Effect of Ca substitution on structural, magnetic and dielectric properties of BiFeO₃

Cited by 17 publications

References 26 publications

Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties

Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties

Magnetic and dielectric properties of Ca-substituted BiFeO₃ nanoferrites by the sol-gel method

Structural, Magnetic, and Dielectric Properties of Sn-Doped BiFeO3: Experiment and DFT Analysis

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Effect of Ca substitution on structural, magnetic and dielectric properties of BiFeO3

Cited by 17 publications

References 26 publications

Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties

Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties

Magnetic and dielectric properties of Ca-substituted BiFeO3 nanoferrites by the sol-gel method

Structural, Magnetic, and Dielectric Properties of Sn-Doped BiFeO3: Experiment and DFT Analysis

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Effect of Ca substitution on structural, magnetic and dielectric properties of BiFeO₃

Magnetic and dielectric properties of Ca-substituted BiFeO₃ nanoferrites by the sol-gel method