Study of Slow Lattice Dynamics in Relaxor Ferroelectric PMN-30% PT by Neutron Spin Echo Technique

• MATSUURA Masato

  Institute for Materials Research, Tohoku University

Bibliographic Information

Other Title

• 中性子スピンエコ法によるリラクサー誘電体の格子ダイナミクスの研究
• チュウセイシ スピンエコーホウ ニ ヨル リラクサー ユウデンタイ ノ コウシ ダイナミクス ノ ケンキュウ

Abstract

Slow lattice dynamics in the relaxor ferroelectric 0.7Pb(Mg_1/3Nb_2/3)O₃-0.3PbTiO₃ were investigated by neutron spin echo technique. At much higher temperature than T_C (400 K), we observed oscillating normalized intermediate scattering functions I(Q,t)/I(Q,0) for the [1-10] direction, which is ascribed to low frequency vibrational mode with ω∼40 μeV. Such low frequency mode suggests that flat energy surfaces exist in the free energy potential along the [1-10] direction, which could be associated with degeneracy between the rhombohedral and tetragonal ground states at morphotropic phase boundary. On cooling towards T_C, the oscillation in I(Q,t)/I(Q,0) decreases and I(Q,t)/I(Q,0) becomes time-independent below T_C. This indicates that the low frequency vibrational mode change into the slow relaxational mode showing giant responses.

Journal

• Nihon Kessho Gakkaishi

  Nihon Kessho Gakkaishi 53 (2), 130-134, 2011

  The Crystallographic Society of Japan

Details

• CRID: 1390282679066079232
• NII Article ID: 10028253994
• NII Book ID: AN00188364
• DOI: 10.5940/jcrsj.53.130
• ISSN: 18845576
• ISSN: 03694585
• NDL BIB ID: 11112883
• Web Site: http://id.ndl.go.jp/bib/11112883
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11112883
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed