Microstructural Characteristics of Strontium Magnesium Niobate

Hwack Joo Lee, Hyun Min Park, Yang Koo Cho, Yong Won Song, Sahn Nahm, Jae Dong Byun

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Abstract

Microstructural studies were conducted on the domain boundaries in Sr(Mg1/3Nb2/3)O3 (SMN) complex perovskite compound using X-ray diffractometry and transmission electron microscopy. Both the 1:2 chemical ordering of B-site cations and the tilting of oxygen octahedra were involved in SMN. SMN had a 1:2 ordered monoclinic unit cell, which was distorted by the antiphase tilting of oxygen octahedra. Two types of domain boundaries were found: the antiphase boundaries (APBs), which are not confined crystallographically, and the ferroelastic domain boundaries, which were parallel to the crystallographic planes. SMN had the superlattice reflections of type ±1/6[111] and ±1/2[111] in the electron diffraction patterns, which cannot be indexed in terms of the 1:2 ordered trigonal phase with only a hexagonal unit cell. The presence of the ferroelastic domains that contained both the 1:2 ordered and the antiphase tilting had been verified by a high-resolution transmission electron microscopy lattice image. The structure of SMN was well explained by a model proposed by other researchers. The formation of the 1:2 ordered domains preceded the ferroelastic domains. Normally, the growth of the ferroelastic domain is not affected by APBs, but it is interrupted by them when the driving force for growth is insufficient, resulting in the stoppage of the domains at APBs.

Original languageEnglish
Pages (from-to)3032-3036
Number of pages5
JournalJournal of the American Ceramic Society
Volume84
Issue number3-12
Publication statusPublished - 2001 Dec 1

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Lee, H. J., Park, H. M., Cho, Y. K., Song, Y. W., Nahm, S., & Byun, J. D. (2001). Microstructural Characteristics of Strontium Magnesium Niobate. Journal of the American Ceramic Society, 84(3-12), 3032-3036.