Enhancement of magnetic and electrical properties in Sc substituted BiFeO3 multiferroic

Rao, T. Durga; Kumari, Anupma; Niranjan, Manish K.; Asthana, Saket

doi:10.1016/j.physb.2014.03.055

Cited by 42 publications

(11 citation statements)

References 28 publications

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“…The detailed experimental analysis can be found elsewhere. 10 The structural analysis was carried out by an X-ray diffractometer (Panalytical X'pert Pro) with CuK a radiation (k ¼ 1.5406 Å ) in the range 20 2h 90…”

Section: Methodsmentioning

confidence: 99%

“…It has been observed that the substitution of Sc at the Fe-site of BFO enhances the insulating character by reducing the leakage current. 10,11 Also, it is reported that rare earth substitution at Bi-site enhances the multiferroic properties and reduces the leakage currents. 11,12 In addition to the improved properties, the substitution distorts the crystal structure and transforms to another structure.…”

Section: ••mentioning

confidence: 99%

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Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

Rao

Kandula

Kumar

et al. 2018

Journal of Applied Physics

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X-ray diffraction measurements revealed that an orthorhombic Pnma structure evolved with a phase fraction of 84% in the rhombohedral R3c structure of BFO upon the substitution of Sm and Sc. The changes in the intensity and the frequency of Raman modes also corroborated the structural transformation in the BSFSO compound. A decrease in grain size, reduction in porosity, and improved density were observed in the BSFSO compound. An enhanced remanent magnetization of 0.2 emu/g and coercive field of 6.2 kOe were observed, which were attributed to the structural change as well as the destruction of the spin structure with the substitution. Impedance and leakage current measurements revealed that the insulating character of BFO was improved with the substitution of Sm and Sc in BFO and was explained based on the bond enthalpy concept. The enhanced magnetic properties along with the improved insulating character of BSFSO compound will be suitable for device applications. Published by AIP Publishing.

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Section: Methodsmentioning

confidence: 99%

Section: ••mentioning

confidence: 99%

Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

Rao

Kandula

Kumar

et al. 2018

Journal of Applied Physics

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“…[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] In order to overcome this obstacle, many researchers paid much more attention to modifying the preparation technologies, 11,12 the formation of solid solutions, and site engineering (e.g., ion substitution at the Bi and/or Fe sites). [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Studies have shown that site engineering is an economical and effective method to improve the electrical properties of BFO ceramics by improving their resistivity. 11,12,[15][16][17][18][19][20][21]…”

Section: Introductionmentioning

confidence: 99%

“…3 transition metal elements (Ti, Co, Zn, Mn, Sc, Nb, Ni) were used to substitute its Fe site [22][23][24][25][26][27][28]. Table 1 and 2 show the electrical properties of BFO ceramics with ion substitutions for Bi and/or Fe sites, respectively.…”

mentioning

confidence: 99%

“…However, we can also find that their d 33 is not almost reported or usually less than 30 pC/N [15-18, 31, 32]. In table 2, there are almost few systematic reports on the piezoelectricity of BFO ceramics with ion substitution for Fe sites [22][23][24][25][26][27][28] as well as the influences of ion substitution types on their electrical properties [See Table 2], and moreover the ferroelectricity is also rather poor [22,25]. However, few reports concern the effects of the doped element types (Bi site) on the electrical properties of BFO ceramics.…”

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Effects of site engineering and doped element types on piezoelectric and dielectric properties of bismuth ferrite lead-free ceramics

Zheng

2015

J. Mater. Chem. C

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Poor piezoelectric activity is often observed in BiFeO 3 ceramics due to its low resistivity and high coercive field, which easily results in the break down before the domains are switched. Here, we attained a high piezoelectricity using a series of bismuth ferrite ceramics substituted by rare earth elements and transition metal elements {e.g., Bi 0.925 La 0.05 A 0.025 FeO 3 , A: Sm, Yb, Ho, Y, Nd, Pr, Dy, Gd; Bi 0.925 La 0.05 Sm 0.025 Fe 0.95 M 0.05 O 3 , M: Sc, In, Al, Ga, Ni, Co} fabricated by the conventional solid-state method. The influences of site engineering (e.g., Bi site or Fe site) as well as the doped element types on their phase structure, microstructure, and electrical properties have been comparatively analyzed. The ions (e.g., A=Sm, Yb, Ho, and Y) substitution for Bi site is helpful to attain both a pure phase structure and a relatively good piezoelectricity (d 33 ≥40 pC/N) of BFO ceramics, while the ions substitutions for Fe site cannot suppress the formation of impurity phases and then result in the degraded electrical properties. Both XRD and backscattered electron images fully confirmed the existence of the impurity phases (Bi-rich and Fe-rich counterparts) in the ceramics doped by Ga. According to the related experiments, the piezoelectric properties of bismuth ferrite ceramics can be promoted by the site engineering as well as the optimization of the element types. This result will point out a way for us to promote the piezoelectric properties of bismuth ferrite ceramics through choosing both suitable doping elements and eliminating impurity phases.

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Predicting High Magneto‐Electric Coupling in Gd Substituted BiFeO₃

Rao¹,

Sattibabu

Asthana³

2019

Physica Status Solidi (b)

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Polycrystalline BiFeO3 and Bi0.90R0.10FeO3 (R = La, Nd, Eu, Gd, and Ho) compounds are prepared by solid state synthesis. X‐ray diffraction and Raman measurements evidence that La and Nd substitutions retain the rhombohedral R3c crystal structure similar to BiFeO3 whereas a nominal orthorhombic phases are evolved in Eu, Gd, and Ho‐substituted compounds. The magnetic measurements at 10 and 300 K clearly indicate that the substitution modifies the spin structure of BiFeO3 and enhances the remanent magnetization Mr and coercive field Hc. The improved magnetic properties are correlated to the tolerance factor t of the compound. The variation of Hc with respect to field at 10 and 300 K illustrates the possibility of high magneto‐electric coupling in the Gd substituted compounds. The substitution of rare earth elements results better ferroelectric hysteresis loops due to the reduction of leakage currents. Better and enhanced ferroelectric properties are observed with La substitution. The observed ferroelectric properties are also discussed in terms of tolerance factor. This study is useful to identify the potential rare earth substituent to tune the magnetic and ferroelectric properties of BFO.

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Enhancement of magnetic and electrical properties in Sc substituted BiFeO3 multiferroic

Cited by 42 publications

References 28 publications

Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

Effects of site engineering and doped element types on piezoelectric and dielectric properties of bismuth ferrite lead-free ceramics

Predicting High Magneto‐Electric Coupling in Gd Substituted BiFeO₃

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Enhancement of magnetic and electrical properties in Sc substituted BiFeO3 multiferroic

Cited by 42 publications

References 28 publications

Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

Effects of site engineering and doped element types on piezoelectric and dielectric properties of bismuth ferrite lead-free ceramics

Predicting High Magneto‐Electric Coupling in Gd Substituted BiFeO3

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Predicting High Magneto‐Electric Coupling in Gd Substituted BiFeO₃