Impedance spectroscopy of multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi><mml:msub><mml:mi mathvariant="normal">Zr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Ti</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Co</mml:m

Ortega, N.; Kumar, Ashok; Bhattacharya, P.; Majumder, Snehamoy; Katiyar, Ram S.

doi:10.1103/physrevb.77.014111

Cited by 389 publications

(121 citation statements)

References 33 publications

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“…The electrical parameters ( b R and gb R ) obtained from the fitting using the equivalent circuit models at different temperatures for NCZF have been summarized in Table 1. The assignment of the two semicircular arcs to the electrical response due to grain interior and grain boundary is consistent with a brick-layer model for a polycrystalline sample [21]. It is observed that both b R and gb R decrease with increasing temperature [18].…”

Section: Complex Impedance Analysissupporting

confidence: 62%

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

2015

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Abstract:The electrical properties of Ni 0.27 Cu 0.10 Zn 0.63 Fe 2 O 4 (NCZF) prepared from auto combustion synthesis of ferrite powders have been studied by impedance and modulus spectroscopy. We studied frequency and temperature dependencies of impedance and electric modulus of NCZF in a wide frequency range (20 Hz-5 MHz) at different measuring temperatures SM T (30-225 ℃). The complex impedance spectra clearly showed both grain and grain boundary effects on the electrical properties. The observed impedance spectra indicated that the magnitude of grain boundary resistance gb R becomes more prominent compared to grain resistance b R at room temperature, and with the increase in SM T , gb R decreases faster than the intrinsic b R . The frequency response of the imaginary part of impedance showed relaxation behavior at every SM T , and the relaxation frequency variation with SM T appeared to be of Arrhenius nature and the activation energy has been estimated to be 0.37 eV. A complex modulus spectrum was used to understand the mechanism of the electrical transport process, which indicated that a non-Debye type of conductivity relaxation characterizes this material.

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Section: Complex Impedance Analysissupporting

confidence: 62%

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

2015

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“…It can be seen that three main peaks (298 cm -1 , 459 cm -1 , and 677 cm -1 ) of the spinel CFO are clearly observed for all the films without any Raman shift (Ortega et al, 2008;Yu et al, 2002). Films annealed below 600 o C show the presence of a peak at 600 cm -1 , which can be assigned to CFO, supporting the inference that below 600 o C, formation of CFO does not go to completion.…”

Section: Characterizationssupporting

confidence: 63%

Deposition of CoFe2O4 Composite Thick Films and Their Magnetic, Electrical Properties Characterizations

Chen¹,

Zhu²

2011

Ferroelectrics - Material Aspects

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“…Different hopping mechanisms have been reported by various researchers and these mechanisms predicted different temperature and frequency dependence on exponent n. In case of small polaron hopping, n increases with temperature, while for a large polaron hopping, n decreases with increasing temperature. 83 As shown in inset of Figure 7(a), the numerical values of n obtained are < 1 and are found to decrease below 570 K and increase above 620 K, hence we conclude that the conduction arises mainly due to the short-range order translation hopping assisted by both large polaron (T < 570 K) and small polaron (T > 620 K) hopping mechanisms.…”

Section: H Complex Conductivity Spectroscopymentioning

confidence: 89%

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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Impedance spectroscopy of multiferroicPbZrxTi1−xO3∕Co

Cited by 389 publications

References 33 publications

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

Deposition of CoFe2O4 Composite Thick Films and Their Magnetic, Electrical Properties Characterizations

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

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