Dielectric relaxation in perovskite

Dutta, Alo; Sinha, T.P.

doi:10.1016/j.jpcs.2006.02.002

Cited by 91 publications

(39 citation statements)

References 15 publications

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“…The tan ı peaks were observed at higher temperatures (≥300 • C) which shift towards the higher frequency region (with rise in temperature). This type of feature suggests the presence of dielectric relaxation in the compound [20,21]. Fig.…”

Section: Resultsmentioning

confidence: 80%

Ac conductivity and relaxation mechanism in Ba0.9Sr0.1TiO3

Singh

Barik

Choudhary

et al. 2009

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 80%

Ac conductivity and relaxation mechanism in Ba0.9Sr0.1TiO3

Singh

Barik

Choudhary

et al. 2009

Journal of Alloys and Compounds

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“…The activation energy for the relaxation associated with the bulk is substantially higher than that observed in some other double perovskites, whose BЈ and BЉ ions have the same valence than Bi 3+ and Sb 5+ such as Ca 2 FeSbO 6 ͑ϳ0.60 eV͒, 43 Ba 2 FeSbO 6 ͑ϳ0.75 eV͒, 42 and Ba 2 AlNbO 6 ͑ϳ0.49 eV͒. 40 This bulk activation energy has a magnitude of the order of the oxygen vacancy motion. 36 The temperature dependence of the dielectric constant is showed in Fig.…”

Section: Resultsmentioning

confidence: 70%

“…These two relaxation processes are due to the bulk ͑first process͒ and to the grain boundary ͑second process͒. This effect was not observed in other double perovskites, [39][40][41][42][43][44][45] probably due to the high sintering temperature used in these other compounds. In order to analyze the temperature dependence of the relaxation time of these two processes we plot in Fig.…”

Section: Resultsmentioning

confidence: 92%

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Relaxations in Ba2BiSbO6 double complex perovskite ceramics

Castro

Paschoal

Snyder

et al. 2008

Journal of Applied Physics

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The electric properties of the complex double perovskite Ba 2 BiSbO 6 have been investigated using impedance spectroscopy in the frequency range from 1 Hz up to 1 MHz and in the temperature range from room temperature up to 560 K. There are two contributions to the electrical properties due to the grain and grain boundary. The oxygen vacancies play an important role in the conductivity and strongly increase the dielectric constant at high temperatures. The analysis of the frequency dependence of the conductivity clearly shows the structural phase transition of this compound near 515 K.

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“…The low frequency side of the peak indicates the range of frequency where charge carriers can make successful hopping from one site to the other neighboring sites and can move over a long range. The high frequency region indicates the range of frequencies where charge carriers are specially confined within their potential well and can only stutter locally [34].…”

Section: Electric Modulus Analysismentioning

confidence: 99%

Conductivity and electrical modulus studies of La2−x Nd x Mo1.7W0.3O9−δ oxygen ion conductor

Borah

Paik

Hashmi

et al. 2012

Ionics

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La 2−x Nd x Mo 1.7 W 0.3 O 9−δ (x 00 − 0.5) and, for comparison, La 2 Mo 2 O 9 compounds have been synthesized following solid state reaction technique. Temperaturedependent electrical conductivity of La 2−x Nd x Mo 1.7 W 0.3 O 9−δ reveals suppression of the phase transition as compared to parent La 2 Mo 2 O 9 compound. Partial substitution of Nd at the La site of La 2 Mo 1.7 W 0.3 O 9−δ increases the conductivity of La 2 Mo 1.7 W 0.3 O 9−δ in the entire temperature regime. In the intermediate temperature region (405°C≤T≤ 570°C), the overall conductivity of La 2−x Nd x Mo 1.7 W 0.3 O 9−δ (0.1≤x≤0.5) is higher than that of the parent compound, and the conductivity of the compound with x00.1 is almost same with the La 2 Mo 2 O 9 in the high temperature region (T≥640°C). Arrhenius to Vogel-Tamman-Fulcher (VTF) transition is observed in all doped specimens above 460°C. Ion relaxation mechanism has been discussed in the framework of electrical modulus analysis in the temperature range RT-530°C and is found to be non-Debye type of conductivity relaxation with the distribution of transition rates for hopping ions in the range of 0.60-0.70.

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Dielectric relaxation in perovskite

Cited by 91 publications

References 15 publications

Ac conductivity and relaxation mechanism in Ba0.9Sr0.1TiO3

Ac conductivity and relaxation mechanism in Ba0.9Sr0.1TiO3

Relaxations in Ba2BiSbO6 double complex perovskite ceramics

Conductivity and electrical modulus studies of La2−x Nd x Mo1.7W0.3O9−δ oxygen ion conductor

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