Microstructural changes in lanthanum-doped barium magnesium niobate

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

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Observations of microstructural changes in (Ba0.95La0.05)-(Mg0.35Nb0.65)O3 and (Ba0.925La0.075)(Mg0.36Nb0.64)O3 (BLMN) were carried out using high-resolution transmission electron microscopy (HRTEM) and synchrotron powder X-ray diffractometry (XRD). In both samples, not only 1:1 and 1:2 ordered domains coexisted in a single grain, but also the intermediate phase, whose structure had a superlattice modulation of 1.42 nm, which was equivalent to 6 times the unit cube of disordered perovskite found on the nanoscale. The ordered 1:2 domains gradually transformed to 1:1 ordered structure through the formation of an intermediate superlattice structure that comprised 6 × 6 × 6 cubic unit cells with different chemical orderings of B-site ions in B-site lattices. Also, the features of thin plates could be detected by XRD patterns and HRTEM. When the thicknesses were very thin, about several atomic distances, stacking faults occurred on (111) planes. However, when their thicknesses were >50 nm, the thin plates existed as a transition phase with their own structure. They were coherent with the matrix and continuously decomposed into the matrix phase by the lateral migration of the interfaces.

Original languageEnglish
Pages (from-to)2529-2537
Number of pages9
JournalJournal of the American Ceramic Society
Issue number9
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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