Crystal structures of (Ba1-xLax)[Mg(1+x)/3Nb(2-x)/3]O 3 with 0.9 ≤ x ≤ 1.0

Hyun Min Park, Hwack Joo Lee, Yang Koo Cho, Sahn Nahm

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Based on a structure model of mixture of phases, the crystal structure analysis of (Ba1-xLax)[Mg(1+x)/3Nb(2-x)/3]O 3 (BLMN) (x = 0.9 and 1.0) by Rietveld refinements was carried out. The pure La(Mg2/3Nb1/3)O3 (LMN) and BLMN (x = 0.9) actually consist of a two-phase mixture rather a single phase. One is Fm-3̄m, which is cubic and 1:1 ordered and the other is P21/n, which is monoclinic and has both 1:1 ordering and the antiphase and inphase tilting of oxygen octahedra with a-a-c+. The weight fraction of the Fm-3̄m phase is 17.5% at x = 0.9 and further decreases to 7.5% in pure LMN. Meanwhile, that of the P21/n phase is 82.5% at x = 0.9 and further increases to 92.5% in pure LMN. The I4/m phase, which is present as a minor phase from x = 0.3 to 0.7, disappeared when x ≥ 0.9. The abrupt change of the x-ray diffraction pattern at x = 0.9 is caused by a change of major phase from Fm-3̄m to P21/n phase in the matrix.

Original languageEnglish
Pages (from-to)1003-1010
Number of pages8
JournalJournal of Materials Research
Volume18
Issue number4
DOIs
Publication statusPublished - 2003 Apr

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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