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1999 Fiscal Year Final Research Report Summary

Origin of fundamental functions in relaxor ferroelectrics

Research Project

Project/Area Number 09440122
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionWaseda University

Principal Investigator

UESU Yoshiaki  Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (10063744)

Co-Investigator(Kenkyū-buntansha) YAMADA Yasusada  Adavanced Research, Institute of Science & Engineering, 理工学総合研究センター, 教授 (00028101)
Project Period (FY) 1997 – 1999
KeywordsRelaxon / ferroelectrics / Pb (Mg 1 / 3 N6 2 / 3) O_3 / Phase Transition / Long namgeorden / Time-depandent Gingliurg-Landan Equation / Nentron Scattering / binefringence
Research Abstract

Relaxors ferroelectrics exhibit broad and huge dielectric susceptibility and the biggest piezoelectric response and are promising materials for small-size capacitors with large capacitance, actuators and ultra-sonic devices. However, the origin of their colossal dielectric response is not well understood, although various models have been proposed so far. In particular, in some prototype relaxors such as Pb (Mg1/3Nb2/3)O3, the long-range order is not developed down to liquid helium temperature. We think that this phenomenon is essential for relaxor properties and have investigated by means of optical, nonlinear optical and neutron scattering techniques. Our previous study revealed that the long-range order can be induced under the applied electric field but shows quite different paths if the specimen experiences different pre-history. The present study clarified that the long-range order develops after long incubation time, which overpasses several ten hours in low temperature. The relaxation processes are found to be classified by at least two processes : One is rather fast response which obeys the Debye-type law and the other is the long process which can be normalized if we introduced an onset time. We are now analyzing these data introducing the elastic long-range interaction force into the Ginzburg-Landau equation.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 岩瀬,上江洲,山田 他: "Neutron Scattering Study of Structural Change in relaxor."J.Phys.Chem.Solids. 60. 1419-1421 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤城,上江洲,山田 他: "Ohtical and Structural Studies of the long-range order development"J.Phys.Soc.Japan. (印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Iwase, . Y.Uesu, Y.Yamada et al.: "Neutron scattering study of structural change in relaxor Pb (Zn1/3Nb2/3) O3"J.Phys.Chem.Solids. 60. 1419-1421 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Fujishiro, Y.Uesu, Y.Yamada et al.: "Optical and structural studies of long-range-order development in relaxors"J.Phys.Soc.Japan. (in print). (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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