Charge Ordered Structure and Dielectric Properties in LuFe2O4

• MATSUO Yoji

  Osaka Prefecture University, Department of Physical Science

• YOSHII Kenji

  Japan Atomic Energy Agency

• IKEDA Naoshi

  Dept. Phys. Okayama Univ.

• MORI Shigeo

  Osaka Prefecture University

Bibliographic Information

Other Title

• 三角格子系鉄複合酸化物ＬｕＦｅ２Ｏ４における電荷秩序構造と誘電特性
• サンカク ゴウシケイ テツ フクゴウ サンカブツ LuFe2O4 ニ オケル デンカ チツジョ コウゾウ ト ユウデン トクセイ

Abstract

Recent works revealed that a ferroelectric polarization in the charge-frustrated system LuFe₂O₄ originates from an emergence of the charge ordering, which is characterized by a regular arrangement of Fe²⁺ and Fe³⁺ ions on the frustrated triangular lattice. In this work, we have investi-gated both the charge ordered (CO) structure and charge ordering processes mainly by means of the transmission electron microscopy (TEM) . Both the CO structure and charge ordering processes depend strongly on the amount of the oxygen deficiency (δ) involved in LuFe₂O_4-δ. In the case of δ-0, the three-dimensional CO structure with the modulation vector of q= [1/3 1/3 1/2] was formed at room temperature. On the other hand, as δ was increased, the three-dimensional CO structure changed into the two-dimensional CO one and the coherent length becomes shorter along the [001] direction. For proper understanding of the dielectric and magnetic properties in LuFe₂O₄ and related materials, it should be essential to prepare LuFe₂O_4-δ samples with properly controlled oxygen-concentration and elucidate the physical properties in LuFe₂O_4-δ with δ-0.

Journal

• Nihon Kessho Gakkaishi

  Nihon Kessho Gakkaishi 50 (2), 150-154, 2008

  The Crystallographic Society of Japan

Details

• CRID: 1390282679063377920
• NII Article ID: 10021085696
• NII Book ID: AN00188364
• DOI: 10.5940/jcrsj.50.150
• COI: 1:CAS:528:DC%2BD1cXntVyjs7k%3D
• ISSN: 18845576
• ISSN: 03694585
• NDL BIB ID: 9502143
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9502143
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed