Heterophase fluctuations near in the relaxor ferroelectrics (1-x)Pb(ZnNb)O-xPbTiO ( = 0.09) studied by X-ray diffuse scattering and coherent X-ray scattering

Owada, Kenji; Mizuki, Junichiro*; Matsushita, Mitsuyoshi*; Namikawa, Kazumichi*

Physical Review B, 90(10), p.104109_1 - 104109_12, 2014/09

https://doi.org/10.1103/PhysRevB.90.104109

The paraelectric (PE) to ferroelectric (FE) first-order phase transition of 0.91Pb(ZnNb)O-0.09PbTiO ( = 455 K on cooling) has been studied by the complementary use of X-ray diffuse scattering (XDS) and coherent X-ray scattering (CXS). XDS was mainly used to investigate the FE regions, while CXS was mainly used to investigate the PE regions above on cooling. The diffuse scattering intensity due to the appearance of FE regions shows a maximum at K. The diffuse scattering is dynamic in nature and the softening trend changes to a hardening trend at . This means that the FE instability is maximum at and therefore the FE regions are well stabilized below . The spatial autocorrelation function obtained by CXS, corresponding to the texture of PE regions, starts to rapidly change at about and is most unstable at . We conclude that a heterophase fluctuation occurs between and near the phase transition. The heterophase fluctuation can be expected to correlate to the low-frequency dielectric dispersion and contribute to the phase transition as a precursor phenomenon of the first-order phase transition.

Self-organization of domains near morphotropic phase boundary studied by coherent X-ray scattering

Owada, Kenji

no journal, , 

no abstracts in English

J-KAREN-P upgrade and perspective on high field sciences

Kando, Masaki; Bulanov, S. V.; Esirkepov, T. Z.; Fukuda, Yuji; Hayashi, Yukio; Kanasaki, Masato; Kiriyama, Hiromitsu; Koga, J. K.; Kon, Akira; Kondo, Kiminori; et al.

no journal, ,