Journal ArticleDOI
Diffuse dielectric anomaly in perovskite-type ferroelectric oxides in the temperature range of 400–700 °C
TLDR
In this article, the authors modified the Debye relaxation equation by introducing the mobile dipole of the thermal motion of oxygen vacancies in order to explain the temperature-dependent behavior of the diffuse dielectric anomaly.Abstract:
The diffuse dielectric anomaly by the dielectric relaxation found at the high-temperature region of 400–700 °C was investigated in perovskite-type ferroelectric oxides such as BaTiO3, (Pb,La)TiO3, and (Pb,La)(Zr,Ti)O3 ceramics. We observed that the diffuse dielectric anomaly in perovskite oxides was strongly affected by oxygen-related processing parameters. We have modified the Debye relaxation equation by introducing the mobile dipole of the thermal motion of oxygen vacancies in order to explain the temperature-dependent behavior of the diffuse dielectric anomaly. A relationship between the dielectric polarization/relaxation and the electrical conduction by the thermal motion of oxygen vacancies was microscopically suggested to explain the origin of the diffuse dielectric anomaly found at 400–700 °C in perovskite-type ferroelectric oxides.read more
Citations
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Journal ArticleDOI
Unfolding grain size effects in barium titanate ferroelectric ceramics
Yongqiang Tan,Jialiang Zhang,Yanqing Wu,Chunlei Wang,Vladimir Koval,Baogui Shi,Haitao Ye,Ruth Mckinnon,Giuseppe Viola,Haixue Yan +9 more
TL;DR: The results show that the grain size effect on the dielectric permittivity is nearly independent of the sintering method and starting powder used, which suggests that besides domain wall density, other factors such as back fields and point defects, which influence the domain wall mobility, could be responsible for the different grain size dependence observed in thedielectric and piezoelectric/ferroelectric properties.
Journal ArticleDOI
Lead-free BaTiO3–Bi(Zn2/3Nb1/3)O3 weakly coupled relaxor ferroelectric materials for energy storage
TL;DR: In this article, BaTiO3 and Bi(Zn2/3Nb1/3)O3 materials were fabricated via solid-state reactions and a pure perovskite pseudocubic structure was obtained for all compositions.
Journal ArticleDOI
Electric modulus approach to the analysis of electric relaxation in highly conducting (Na 0.75 Bi 0.25 )(Mn 0.25 Nb 0.75 )O 3 ceramics
TL;DR: In this paper, the electrical properties of disordered perovskite-like ceramics in a wide temperature range were investigated by using the x-ray diffraction analysis.
Journal ArticleDOI
Oxygen-vacancy-related dielectric relaxations in SrTiO3 at high temperatures
TL;DR: In this article, the dielectric properties of both single crystal and single crystal SrTiO3 samples in the temperature from room temperature to 1073 K were investigated and two relaxations were observed in both samples.
Journal ArticleDOI
Ionized oxygen vacancy-related electrical conductivity in (Pb(1-x)La(x)) (Zr(0.90)Ti(0.10))(1-x/4)O(3) ceramics
Aimé Peláiz-Barranco,Aimé Peláiz-Barranco,José de los Santos Guerra,R. López-Noda,E. B. Araujo +4 more
TL;DR: In this paper, the authors investigated the electrical conductivity behavior in the paraelectric state of lanthanum modified lead zirconate titanate (PLZT) ceramics, considering the universal relaxation law.
References
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Book
Ferroelectric materials and their applications
TL;DR: Ferroelectric tungsten - bronze type niobate crystals as discussed by the authors is a type of ferroelectric crystal material that can be used to construct piezoelectric composites.
Journal ArticleDOI
Oxygen-vacancy-related low-frequency dielectric relaxation and electrical conduction in B i : S r T i O 3
TL;DR: In this article, three sets of oxygen vacancies related dielectric peaks (peaks A, B, and C) were measured from 10 to 800 K. The results show that the Maxwell-Wagner polarization is not the main mechanism, and the Skanavi's model also cannot be directly applied.
Journal ArticleDOI
Space-charge relaxation in perovskites.
TL;DR: This anomaly is shown to arise from a Debye dielectric dispersion that slows down following an Arrhenius law and it is proposed that it can be achieved through a space-charge model that quantitatively agrees with the experimental results in the lower temperature range.
Journal ArticleDOI
Bulk Conductivity and Defect Chemistry of Acceptor‐Doped Strontium Titanate in the Quenched State
TL;DR: In this paper, the influence of the oxygen partial pressure during equilibration, PEqO2, is described in terms of a defect model for titanates, and a predominant ionic conductivity is concluded for a wide PEq O2 range (approximately 10−11 to 105 Pa).