Influence of bulk and interface properties on the electric transport in ABO3 perovskites

Stumpe, R.; Wagner, Dieter; Bäuerle, D.

doi:10.1002/pssa.2210750116

Cited by 146 publications

(64 citation statements)

References 29 publications

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“…This implies that each anomaly contains two Debye-type relaxations. A diffuse dielectric anomaly consisted of two peaks in a thinning sample had been already reported by Stumpe et al in the single crystal of BaTiO 3 [16]. To identify whether the high-temperature anomaly in CTO is composed of two relaxations, we conducted dielectric measurements after two consecutive thinning processes by polishing the pellet evenly from both sides.…”

Section: Resultsmentioning

confidence: 81%

“…To date, several mechanisms unrelated to true relaxor that can produce a relaxor-like anomaly have been proposed. These mechanisms can be classified into three types: (i) the dipole model associated with different mobile defects based on the universal feature that the anomaly is very sensitive to the oxygen vacancy especially for the titanate perovskites [13][14][15]; (ii) the Maxwell-Wagner model due to electrical inhomogeneity in the tested sample [16][17][18][19]; and (iii) the competitive phenomenon between the dielectric relaxation and the electric conduction of the relaxing species [20][21][22]. Before clarifying which mechanism underlies the observed anomalies, details about the nature of these anomalies are required.…”

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confidence: 99%

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Diffuse Dielectric Anomalies in CoTiO3 at High Temperatures

Wang¹,

Zhang²,

Wang³

et al. 2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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Section: Resultsmentioning

confidence: 81%

mentioning

confidence: 99%

Diffuse Dielectric Anomalies in CoTiO3 at High Temperatures

Wang¹,

Zhang²,

Wang³

et al. 2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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“…4a). This dispersion is a common feature in a lot of different ferroelectrics (particularly single crystals and ceramics characterized by ABO 3 perovskite structure) [25][26][27][28] and connected with the space charge present in the sample. A clear link exists between the mentioned dispersion and sample conductivity.…”

Section: Dielectric and Thermally Stimulated Depolarization Currents mentioning

confidence: 94%

“…A clear link exists between the mentioned dispersion and sample conductivity. The thermal treatment caused an increase of the space charge participation in the bulk of the sample, which led to the increase of both conductivity and dielectric dispersion [27]. Moreover the important role of space charge in screening polar nanoregions should not be forgot.…”

Section: Dielectric and Thermally Stimulated Depolarization Currents mentioning

confidence: 99%

Influence Of Thermal Treatment On Relaxor Properties Of BaBi2Nb2O9 Ceramics

Adamczyk¹,

Pilch²,

Pawełczyk³

2015

Archives of Metallurgy and Materials

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In the hereby paper the implications of thermal modification of BaBi 2 Nb 2 O 9 ceramics in high vacuum (5×10 −11 bar) at a temperature equal of 1173K are widely discussed. The mentioned modification caused changes in the ions concentration (confirmed by EDS and XPS analysis) and as a consequence an influence on the value of the unit cell parameters as well as on the dielectric and relaxor properties of described ceramics. The obtained results of EDS and XPS analysis of the sample before and after thermal treatment revealed bismuth ions diffusion to the surface of the sample (which was expected) and an almost complete the lack of barium ions on the modified surface. The comparison of EDS and XPS analysis results, suggested that they penetrated the interior of the sample and embedded into the crystal structure in place of bismuth. The hypothesis is in good agreement with the results of X-ray diffraction -the volume of the unit cell had an insignificant increase. The changes in the ions concentration influenced, also in a distinct manner, the dielectric and relaxor properties as well as on the shape of temperature characteristic of thermal stimulated depolarization current observed in BBN ceramics.Keywords: ceramics, ferroelcectric relaxor, BBN, thermal treatment W niniejszym artykule są szeroko dyskutowane konsekwencje obróbki termicznej ceramiki BaBi 2 Nb 2 O 9 w warunkach wysokiej próżni (5×10 −11 bar) w temperaturze 1173K. Wyniki analizy XPS wykonane zarówno przed jak i po obróbce cieplnej ujawniły dyfuzję jonów bizmutu ku powierzchni próbki (co było oczekiwane) i prawie całkowity brak jonów baru na modyfikowanej powierzchni. Porównanie wyników analizy EDS i XPS sugeruje, że jony baru dyfundują do wnętrza próbki i najprawdopodobniej wbudowują się w strukturę krystaliczną w miejsca bizmutu. Ta hipoteza pozostaje w dobrej zgodności z wynikami badań rentgenowskich -objętość komórki elementarnej. Zmiany w koncentracji jonów wpływają również na właściwości dielektryczne oraz zachowania charakterystyczne dla ferroelektrycznych relaksorów, a także kształt charakterystyk temperaturowych prądów termicznie stymulowanej depolaryzacji (TSDC) obserwowanych w ceramice BBN.

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“…The first process for this is the creation of oxygen vacancies through a careful control of the reducing atmosphere to which bulk materials are submitted. [17][18][19] This space charge effect is a very general trend of bulk ferroelectric annealed at high temperature. 19 Because of the restricted geometry and of the sharp processing conditions, such space charges can be localized at room temperature in thin films.…”

Section: Introductionmentioning

confidence: 99%

Free charge localization and effective dielectric permittivity in oxides

Maglione

2016

J. Adv. Dielect.

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This review will deal with several types of free charge localization in oxides and their consequences on the effective dielectric spectra of such materials. The first one is the polaronic localization at the unit cell scale on residual impurities in ferroelectric networks. The second one is the collective localization of free charge at macroscopic interfaces like surfaces, electrodes and grain boundaries in ceramics. Polarons have been observed in many oxide perovskites mostly when cations having several stable electronic configurations are present. In manganites, the density of such polarons is so high as to drive a net lattice of interacting polarons. On the other hand, in ferroelectric materials like BaTiO 3 and LiNbO 3 , the density of polarons is usually very small but they can influence strongly the macroscopic conductivity. The contribution of such polarons to the dielectric spectra of ferroelectric materials is described. Even residual impurities as for example Iron can induce well-defined anomalies at very low temperatures. This is mostly resulting from the interaction between localized polarons and the highly polarizable ferroelectric network in which they are embedded. The case of such residual polarons in SrTiO 3 will be described in more detail, emphasizing the quantum polaron state at liquid helium temperatures. Recently, several nonferroelectric oxides have been shown to display giant effective dielectric permittivity. It is first shown that the frequency/temperature behavior of such parameters is very similar in very different compounds (donor-doped BaTiO 3 , CaCu 3 Ti 4 O 12 , LuFe 2 O 4 , Li-doped NiO, etc.). This similarity calls for a common origin of the giant dielectric permittivity in these compounds. A space charge localization at macroscopic interfaces can be the key for such extremely high dielectric permittivity.

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Influence of bulk and interface properties on the electric transport in ABO3 perovskites

Cited by 146 publications

References 29 publications

Diffuse Dielectric Anomalies in CoTiO3 at High Temperatures

Diffuse Dielectric Anomalies in CoTiO3 at High Temperatures

Influence Of Thermal Treatment On Relaxor Properties Of BaBi2Nb2O9 Ceramics

Free charge localization and effective dielectric permittivity in oxides

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