Effects of Nd and high-valence Mn co-doping on the electrical and magnetic properties of multiferroic ceramics

Hu, Zhongqiang; Li, Meiya; Yu, Yi; Liu, Jun; Pei, Lei; Wang, Jing; Liu, Xiaolian; Yu, Bo; Zhao, Xingzhong

doi:10.1016/j.ssc.2010.03.015

Cited by 129 publications

(63 citation statements)

References 20 publications

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“…84 The activation energies calculated from ac conductivity spectra (Figure 7(b)) in different temperature regions (I, II, III) at selected frequencies are given in Table IV. It was found that the activation energies determined in regions II and III are in the same range as those calculated from Z 00 vs. f (0.42 eV) and M 00 vs. f (0.39 eV) plots for the same temperature interval 14,86,87 On the other hand, it was found that the BiFe 1Àx Mn x O 3 (x 0.3) shows an increase in magnetization with increase in Mn content but antiferromagnetic nature was observed in all samples. 88,89 The improvement in magnetic properties in the BNFM ceramic sample could be due to collapse of the spin cycloid structure.…”

Section: H Complex Conductivity Spectroscopysupporting

confidence: 55%

“…This may be caused by the Nd and Mn doping in the A and B sites of the BFO due to structural distortion such as changes in the bond length and bond angles. 14,86,88 The weak magnetization with larger coercive field and small remanent magnetization (M r ) observed in the BNFM samples can be due to the presence of iron oxides impurities. 85 However, M-H loops were not saturated even if at a high applied magnetic field of 7 T indicating the slow transformation of G-type antiferromagnetic behavior of BFO into a weak ferromagnetic BNFM material.…”

Section: H Complex Conductivity Spectroscopymentioning

confidence: 99%

“…A or B sites substitution in BFO can lead to reduction in leakage current, increase in resistivity, and enhancement in the ferroelectric and ferromagnetic properties. 13,14 Hence, there is a lot of research going on in the synthesis of suitably doped BFO. For example, Yu et al 13 3 (BFM) films in a wide range of electric fields.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Kumari

Ortega

Kumar

et al. 2015

Journal of Applied Physics

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We describe systematic studies on Nd and Mn co-doped BiFeO 3 , i.e., (Bi 0.95 Nd 0.05 ) (Fe 0.97 Mn 0.03 )O 3 (BNFM) polycrystalline electroceramics. Raman spectra and X-ray diffraction patterns revealed the formation of rhombohedral crystal structure at room temperature, and ruled out structural changes in BiFeO 3 (BFO) after low percentage chemical substitution. Strong dielectric dispersion and a sharp anomaly around 620 K observed near the Neel temperature (T N $ 643 K of BFO) support strong magneto-dielectric coupling, verified by the exothermic peak in differential thermal data. Impedance spectroscopy disclosed the appearance of grain boundary contributions in the dielectric data in the region, and their disappearance just near the Neel temperature suggests magnetically active grain boundaries. The resistive grain boundary components of the BNFM are mainly responsible for magneto-dielectric coupling. Capacitive grain boundaries are not observed in the modulus spectra and the dielectric behavior deviates from the ideal Debye-type. The ac conduction studies illustrate short-range order with ionic translations assisted by both large and small polaron hopping. Magnetic studies indicate that the weak antiferromagnetic phase of BNFM ceramics is dominated by a strong paramagnetic response (unsaturated magnetization even at applied magnetic field of 7 T). The bulk BNFM sample shows a good in-plane magnetoelectric coupling (ME) coefficient. V C 2015 AIP Publishing LLC. [http://dx

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Section: H Complex Conductivity Spectroscopysupporting

confidence: 55%

Section: H Complex Conductivity Spectroscopymentioning

confidence: 99%

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Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Kumari

Ortega

Kumar

et al. 2015

Journal of Applied Physics

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“…Various methods, besides the conventional one [23], were used for material synthesis in bulk and nanopowder forms, such as solgel [24][25][26][27], molten alkali metal nitrates [28], solvothermal [29], hydrothermal [30], and rapid liquid phase sintering [20].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Bi_0.9M_0.05N_0.05FeO₃(M = Sm, Gd; N = Sr, Y) polycrystalline multiferroic compounds

Al-Haj

2010

Cryst. Res. Technol.

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FeO 3 were prepared by the conventional ceramic method and were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometry, and differential scanning calorimetry. The compounds were found to have the rhombohedral perovskite-like structure, accompanied by the existence of small amounts of Bi 2 Fe 4 O 9 and Bi 25 FeO 40 impurity phases. The appearance of weak ferromagnetism in Bi 0.9 Gd 0.05 Sr 0.05 FeO 3 and Bi 0.9 Sm 0.05 Sr 0.05 FeO 3 is due to partial destruction of the spiral spin structure due to lattice distortion and oxygen vacancies. The magnetic transition temperatures of the compounds are 360 °C and 355 °C, respectively.

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“…Previous investigations confirmed that cation substitution enhances ferroelectric property of BFO by virtue of reduced leakage current. 34,55,56 Moreover, a particle size dependent polarization for BBFO nanoparticles is vivid in Fig. 7.…”

Section: -11mentioning

confidence: 91%

Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

et al. 2016

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Improvement in magnetic and electrical properties of multiferroic BiFeO3 in conjunction with their dependence on particle size is crucial due to its potential applications in multifunctional miniaturized devices. In this investigation, we report a study on particle size dependent structural, magnetic and electrical properties of sol-gel derived Bi0.9Ba0.1FeO3 nanoparticles of different sizes ranging from ∼ 12 to 49 nm. The substitution of Bi by Ba significantly suppresses oxygen vacancies, reduces leakage current density and Fe 2+ state. An improvement in both magnetic and electrical properties is observed for 10 % Ba-doped BiFeO3 nanoparticles compared to its undoped counterpart. The saturation magnetization of Bi0.9Ba0.1FeO3 nanoparticles increase with reducing particle size in contrast with a decreasing trend of ferroelectric polarization. Moreover, a first order metamagnetic transition is noticed for ∼ 49 nm Bi0.9Ba0.1FeO3 nanoparticles which disappeared with decreasing particle size. The observed strong size dependent multiferroic properties are attributed to the complex interaction between vacancy induced crystallographic defects, multiple valence states of Fe, uncompensated surface spins, crystallographic distortion and suppression of spiral spin cycloid of BiFeO3.

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Effects of Nd and high-valence Mn co-doping on the electrical and magnetic properties of multiferroic ceramics

Cited by 129 publications

References 20 publications

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Preparation and characterization of Bi_0.9M_0.05N_0.05FeO₃(M = Sm, Gd; N = Sr, Y) polycrystalline multiferroic compounds

Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

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Effects of Nd and high-valence Mn co-doping on the electrical and magnetic properties of multiferroic ceramics

Cited by 129 publications

References 20 publications

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Preparation and characterization of Bi0.9M0.05N0.05FeO3(M = Sm, Gd; N = Sr, Y) polycrystalline multiferroic compounds

Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

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Preparation and characterization of Bi_0.9M_0.05N_0.05FeO₃(M = Sm, Gd; N = Sr, Y) polycrystalline multiferroic compounds