Dielectric And Impedance Spectroscopic Studies Of Multiferroic BiFe1-xNixO3

Biswal, Manas Ranjan; Nanda, J.; Mishra, N. C.; Anwar, Shahid; Mishra, A. K.

doi:10.5185/amlett.2014.4566

Cited by 67 publications

(25 citation statements)

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“…A similar type of anomaly around 620 K has been observed for temperature dependent tan d and thermal data (explained in Section III F) of this sample, which is shown in the insets of Figures 5(a) and 5(b). With the rise of temperature, further increment in tan d has been observed above T N ; Similar behavior in tan d has been observed by other researches, e.g., Pandit et al 59 observed an increase of tan d until $40 at 500 Hz for Bi 0.83 Nd 0.07 La 0.1 FeO 3 ceramics near the Neel temperature; Uniyal et al 60 found tan d as $10 at 100 kHz for Bi 0.95 Eu 0.05 FeO 3 at 400 C and Biswal et al 61 observed tan d between 80 and 100 at 10 kHz for Ni doped BFO ceramics for different compositions at about 400 C. This behavior can be due to contribution of space charge polarization, which arises because of oxygen ion vacancies at high temperature. 55 Another reason is the presence of the Fe ion, which is a transition element, because of that ionic conduction (Fe þ3 to Fe þ2 ) is increasing inside the sample, resulting in an increase in tan d at higher temperatures.…”

Section: E Dielectric Spectroscopysupporting

confidence: 70%

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: E Dielectric Spectroscopysupporting

confidence: 70%

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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“…As shown here, the magnitude of Z′ in the low‐frequency region has an inverse relationship with temperature, while in the high frequency region, the data from different temperatures merge. This behavior is in agreement with the negative temperature coefficient of resistance, [42–44] and the decrease in energy barrier in grain boundaries [33,41–44] . As observed here, the Z′ values for Li 2 (La 0.75 Li 0.25 )(Ta 1.5 Ti 0.5 )O 7 are lower than those of Li 2 La(TaTi)O 7 , indicating the enhanced conductivity of the former material.…”

Section: Resultssupporting

confidence: 90%

Lithium‐Ion Mobility in Layered Oxide Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇ Containing Lithium on both Intra and Inter‐Stack Positions

Fanah

Ramezanipour

2022

Eur J Inorg Chem

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With the aid of neutron diffraction and electrochemical impedance spectroscopy, we have demonstrated the effect of the increase in lithium concentration and distribution on Li‐ion conductivity. This has been done through the synthesis of a layered oxide Li2(La0.75Li0.25)(Ta1.5Ti0.5)O7, with the so‐called Ruddlesden‐Popper type structure, where bilayer stacks of (Ta/Ti)O6 octahedra are separated by lithium ions, located in inter‐stack spaces. There are also intra‐stack spaces that are occupied by a mixture of La and Li, as confirmed by neutron diffraction. The distribution of lithium over both inter‐ and intra‐stack positions leads to the enhancement of Li‐ion conductivity in Li2(La0.75Li0.25)(Ta1.5Ti0.5)O7 compared to Li2La(TaTi)O7, which has a lower concentration of lithium ions, located only in inter‐stack spaces. The analyses of real and imaginary components of electrochemical impedance data confirm the enhanced mobility of ions in Li2(La0.75Li0.25)(Ta1.5Ti0.5)O7. While the Li‐ion conductivity needs further improvement for practical applications, the success of the strategy implemented in this work offers a useful methodology for the design of layered ionic conductors.

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“…The broading of peaks with increase in temperature confirms the temperature dependent electrical relaxation phenomenon in the prepared samples. In high frequency region, Z″ curves merge revelaing the disappearnce of space charge polarization [23,24].…”

Section: E Impedance Spectroscopymentioning

confidence: 97%

7313 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number C6011098319/2019©BEIESP DOI: 10.35940/ijrte.C6011.098319 Journal Website: www.ijrte.org Structural, Dielectric and Electrical Properties of Fe Doped La0.7Ba0.3MnO3Solid Solutions for Cathode Materials

Paul¹,

Manokamna²,

Kaur³

et al. 2019

IJRTE

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The solid solutions of (La 0.7 Ba 0.3 )(Fe x Mn 1-x )O 3 where x = 0.1 -0.5 ceramics were synthesized by conventional solid-state method. The structural analysis was done by X-Ray diffraction technique and the results have revealed that all the samples were crystallized into a single phase. The surface morphology was done by Scanning Electron Microscopy and the micrographs clearly indicate decreased grain size with the increasing Feconcentration. The density of the prepared samples was done using Archimedes principle and the density values were found to be in decreasing order, which is well in agreement with the microstructure relationship. The dielectric and impedance properties have been studied at different ranges of frequency and temperature. The electrical conductivity values were found to be greater than 100 Scm -1 , which suggests it to suitable cathode material of SOFCs.

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Dielectric And Impedance Spectroscopic Studies Of Multiferroic BiFe1-xNixO3

Cited by 67 publications

References 1 publication

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Lithium‐Ion Mobility in Layered Oxide Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇ Containing Lithium on both Intra and Inter‐Stack Positions

7313 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number C6011098319/2019©BEIESP DOI: 10.35940/ijrte.C6011.098319 Journal Website: www.ijrte.org Structural, Dielectric and Electrical Properties of Fe Doped La0.7Ba0.3MnO3Solid Solutions for Cathode Materials

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Dielectric And Impedance Spectroscopic Studies Of Multiferroic BiFe1-xNixO3

Cited by 67 publications

References 1 publication

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Lithium‐Ion Mobility in Layered Oxide Li2(La0.75Li0.25)(Ta1.5Ti0.5)O7 Containing Lithium on both Intra and Inter‐Stack Positions

7313 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number C6011098319/2019©BEIESP DOI: 10.35940/ijrte.C6011.098319 Journal Website: www.ijrte.org Structural, Dielectric and Electrical Properties of Fe Doped La0.7Ba0.3MnO3Solid Solutions for Cathode Materials

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Lithium‐Ion Mobility in Layered Oxide Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇ Containing Lithium on both Intra and Inter‐Stack Positions