Microstructure of lanthanum magnesium niobate at elevated temperature

Hwack Joo Lee, Hyun Min Park, Yang Koo Cho, Hyun Ryu, Jong Hoo Paik, Sahn Nahm, Jae Dong Byun

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Microstructural studies of the complex perovskite compound La(Mg2/3Nb1/3)O3 (LMN) were conducted using transmission electron microscopy (TEM) and X-ray diffractometry (XRD) at elevated temperatures. 1:1 chemical ordering of B-site cations and tilting of oxygen octahedra were observed in LMN. Three types of superlattice reflections, [1-2]{111}, [1-2]{110}, and [1-2]{100} were observed at room temperature and at 800 °C in electron diffraction patterns. In the XRD experiments, the [1-2]{210} and [1-2]{300} extra peaks disappeared at temperatures >1200 °C. However, the intensity of the superlattice [1-2]{111} peak did not change with increased temperature up to 1400 °C. These results strongly indicated that the origin of superlattice reflection [1-2]{111} was different from that of the other superlattice reflections. It was mainly caused by the 1:1 chemical ordering of magnesium and niobium atoms. The TEM image observed at 800 °C showed the ordered domain structures separated by the antiphase boundaries.

Original languageEnglish
Pages (from-to)943-945
Number of pages3
JournalJournal of the American Ceramic Society
Volume83
Issue number4
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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