Disorder of Pb Atom in Cubic Structure of Pb(Zn1/3Nb2/3)O3–PbTiO3 System

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概要

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• The crystal structures of ($1-x$)Pb(Zn1/3Nb2/3)O3–$x$PbTiO3 (PZN–PT: $0\leq x\leq 0.3$) in the cubic phase at 650 K have been investigated by analyzing the high-energy synchrotron-radiation (SR) powder diffraction data using the Rietveld method. It is found that the Pb atom does not settle at the ideal high-symmetry position with a harmonic thermal parameter. The split-atom method reveals that the Pb atom in the cubic phase is disordered and settles randomly at crystallographically equivalent positions slightly off-center of the cubic-corner site. The disordered directions of the Pb atom are significantly changed at the concentration $x\sim 0.15$. This structural boundary found in the cubic phase is related to the appearance of the morphotropic phase boundary (MPB).

• 2006-09-30

著者

• Moriyoshi Chikako

  Department Of Materials Science Faculty Of Science Hiroshima University

• Iwata Makoto

  Department Of Applied Physics School Of Engineering Nagoya University

• Kim Su

  Department Of Agricultural Chemistry And Research Center For New Bio-materials In Agriculture Seoul

• Takata Masaki

  Riken Spring-8 Center And Crest Japan Science And Technology Agency

• KUROIWA Yoshihiro

  Department of Physical Science, Hiroshima University

• Moriyoshi Chikako

  Department of Physical Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

• Terado Yoshihiro

  Department of Physical Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

• Kim Su

  Department of Physical Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

• Takata Masaki

  RIKEN Harima Institute, Kouto, Sayo-cho, Sayo, Hyogo 679-5148, Japan

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