1996 Fiscal Year Final Research Report Summary
Joint Research on the Fundamental Functions of Relaxors
| Project/Area Number |
08044096
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | WASEDA UNIVERSITY,FACULTY OF SCIENCE & ENGINEERING |
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Principal Investigator |
UESU Yoshiaki WASEDA UNIV.FAC.OF SCIENCE & ENGINEERING,PROF., 理工学部, 教授 (10063744)
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| Co-Investigator(Kenkyū-buntansha) |
KIAT JeanーMi エコール, サントラル・パリ, 主任研究員
MORI Shigeo TOKYO INST.TECHNOLOGY,RESEARCH FELLOW, 理学部, 助手 (20251613)
YAMAMOTO Naoki TOKYO INST.TECHNOLOGY,ASSOC.PROF., 理学部, 助教授 (90108184)
IKEDA Naoshi RISE,WASEDA UNIV.LECTURER, 理工学総合研究センター, 講師 (00222894)
YAMADA Yasusada RISE,WASEDA UNIV.PROF., 理工学総合研究センター, 教授 (00028101)
KIAT J.M. Ecole Centrale, Paris, Researcher
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| Project Period (FY) |
1996
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| Keywords | RELAXOR / DIFFUSE PHASE TRANSITION / DIPOLE GLASS / SLOW DYNAMICS / FERROELECTRICS / PHASE TRANSITION |
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| Research Abstract |
Crystal structure of ferroelectric relaxor Pb (Mg_<1/3>Nb_<2/3>)O_3 from room temperature down to 10K was determined by the neutron diffraction technique with the Rietveld analysis. It was found that the crystal structure at room temperature is a disordered perovskite where a Pb atom is distributed spherically around the ideal A site in the perovskite, an O distributes in rings near {100} surfaces, while a Mg/Nb is located at the B site. When temperature is lowered, the polar rhombohedral region with atomic shifts along the {111} direction develops in the disordered cubic matrix. The second harmonic generation was also measured using a ceramic sample under the field-heating after zero field-cooling process. The non-ergodic behavior was observed.
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