Theoretical description of ABO3 relaxor ferroelectric: A review
نویسندگان
چکیده
منابع مشابه
Structural, optical and dielectric properties of relaxor- ferroelectric Pb0.78Ba0.22Sc0.5Ta0.5O3 Running head: Properties of relaxor-ferroelectric Pb0.78Ba0.22Sc0.5Ta0.5O3
We report on the synthesis of a new relaxor compound with chemical formula Pb0.78Ba0.22Sc0.5Ta0.5O3 (PBST). Single crystals were obtained by the high-temperature solution growth method. The structure of the new compound is of double-perovskite type with face-centred cubic symmetry at room temperature. The frequency dependence of the dielectric constant of PBST shows a strong dielectric dispersi...
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Quantum ferroelectric and ferroelectric relaxor behavior has been found in (Sr121.5xBix)TiO3. For x <0.0267, the quantum ferroelectric relationship T«m}(x2xc) 1/2 holds with xc'0.0005, and obvious hysteresis loops were observed. The polarization relaxation shows critical slowing down. At high Bi concentration, a crossover from quantum ferroelectric to relaxor behavior occurred. The coexistence ...
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In this article, we report the evolution of the dielectric behavior from a dielectric relaxor to a ferroelectric relaxor with variation of Bi concentration in (Sr121.5xBix)TiO3 (0<x<0.2). In the doping range 0.0005<x<0.002, two dielectric modes A and B are induced. The temperature (Tm) where the permittivity maximum occurs for modes A and B is independent of Bi concentration and of dc electric ...
متن کاملFerroelectric Dynamics in the Perovskite Relaxor PMN
We review results obtained from recent neutron scattering studies of the lead-oxide class of perovskite relaxors PMN and PZN. A ferroelectric soft mode has been identified in PMN at 1100 K that becomes overdamped near 620 K. This is the same temperature at which polar nanoregions (PNR) begin to form, denoted by Td , and suggests that a direct connection exists between the soft mode and the PNR....
متن کاملMolecular dynamics study of dielectric response in a relaxor ferroelectric.
We use atomistic molecular dynamics simulations to study relaxor behavior in the 0.75 PbMg(1/3)Nb(2/3)O(3)-0.25 PbTiO(3) material. Even for a fairly small simulation size of 1000 atoms, the system exhibits frequency dispersion and deviation from the Curie-Weiss law typical of relaxor materials. Analysis of the time autocorrelation functions for individual atoms allows us to identify the Nb atom...
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ژورنال
عنوان ژورنال: Indian Journal of Physics
سال: 2009
ISSN: 0019-5480,0974-9845
DOI: 10.1007/s12648-009-0022-2