2011年6月
Contribution of intermediate submicrometer structures to physical properties near T-c in Pb(Zn1/3Nb2/3)O-3-9%PbTiO3
PHYSICAL REVIEW B
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- 巻
- 83
- 号
- 22
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.83.224115
- 出版者・発行元
- AMER PHYSICAL SOC
Complementary use of coherent x-ray diffraction (CXD), x-ray diffuse scattering, conventional x-ray diffraction techniques, and dielectric measurements has enabled us to investigate Pb(Zn1/3Nb2/3)-9%PbTiO3 with a multiple-length-scale approach from the macroscale (lattice constants, bulk averaged) and microscale to the nanoscale [polar nanoregions (PNRs)] and discuss the contribution of each scale to the dielectric permittivity. We estimate that diffuse scattering mainly originates from intra-PNR dynamics, which contributes to "ionic" polarization and results in high-frequency permittivity. Meanwhile, the appearance of intermediate submicrometer (sub-mu m) structures observed by CXD is consistent with the appearance of low-frequency dielectric relaxation. The sub-mu m structures exhibit large fluctuations at T-c. This is also consistent with previously reported results obtained by x-ray intensity fluctuation spectroscopy and should give a lower limit for the low-frequency dielectric dispersion. We have suggested that the fluctuation is due to the competition between the growth of sub-mu m structures and the appearance of the macroscopic tetragonal-ferroelectric phase. Since the present CXD mainly detected the strain field spreading throughout the crystal, we here demonstrate that the sub-mu m structures are due to networks among PNRs connected by the strain field.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.83.224115
- ISSN : 1098-0121
- Web of Science ID : WOS:000292218200003