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
Publication statusPublished - 2000 Jan 1

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Lanthanum
Magnesium
magnesium
microstructure
Microstructure
X ray diffraction analysis
transmission electron microscopy
temperature
Niobium
Transmission electron microscopy
domain structure
niobium
Temperature
perovskite
Electron diffraction
Perovskite
Diffraction patterns
diffraction
Cations
cation

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Lee, H. J., Park, H. M., Cho, Y. K., Ryu, H., Paik, J. H., Nahm, S., & Byun, J. D. (2000). Microstructure of lanthanum magnesium niobate at elevated temperature. Journal of the American Ceramic Society, 83(4), 943-945.

Microstructure of lanthanum magnesium niobate at elevated temperature. / Lee, Hwack Joo; Park, Hyun Min; Cho, Yang Koo; Ryu, Hyun; Paik, Jong Hoo; Nahm, Sahn; Byun, Jae Dong.

In: Journal of the American Ceramic Society, Vol. 83, No. 4, 01.01.2000, p. 943-945.

Research output: Contribution to journalArticle

Lee, HJ, Park, HM, Cho, YK, Ryu, H, Paik, JH, Nahm, S & Byun, JD 2000, 'Microstructure of lanthanum magnesium niobate at elevated temperature', Journal of the American Ceramic Society, vol. 83, no. 4, pp. 943-945.
Lee, Hwack Joo ; Park, Hyun Min ; Cho, Yang Koo ; Ryu, Hyun ; Paik, Jong Hoo ; Nahm, Sahn ; Byun, Jae Dong. / Microstructure of lanthanum magnesium niobate at elevated temperature. In: Journal of the American Ceramic Society. 2000 ; Vol. 83, No. 4. pp. 943-945.
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