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

doi:10.1111/j.1151-2916.2000.tb01299.x

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Microstructural studies of the complex perovskite compound La(Mg_2/3Nb_1/3)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 language	English
Pages (from-to)	943-945
Number of pages	3
Journal	Journal of the American Ceramic Society
Volume	83
Issue number	4
DOIs	https://doi.org/10.1111/j.1151-2916.2000.tb01299.x
Publication status	Published - 2000

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/j.1151-2916.2000.tb01299.x

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title = "Microstructure of lanthanum magnesium niobate at elevated temperature",

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.",

author = "Lee, {Hwack Joo} and Park, {Hyun Min} and Cho, {Yang Koo} and Hyun Ryu and Paik, {Jong Hoo} and Sahn Nahm and Byun, {Jae Dong}",

year = "2000",

doi = "10.1111/j.1151-2916.2000.tb01299.x",

language = "English",

volume = "83",

pages = "943--945",

journal = "Journal of the American Ceramic Society",

issn = "0002-7820",

publisher = "Wiley-Blackwell",

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TY - JOUR

T1 - Microstructure of lanthanum magnesium niobate at elevated temperature

AU - Lee, Hwack Joo

AU - Park, Hyun Min

AU - Cho, Yang Koo

AU - Ryu, Hyun

AU - Paik, Jong Hoo

AU - Nahm, Sahn

AU - Byun, Jae Dong

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

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DO - 10.1111/j.1151-2916.2000.tb01299.x

M3 - Article

AN - SCOPUS:0033879399

SN - 0002-7820

VL - 83

SP - 943

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JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 4

ER -

Microstructure of lanthanum magnesium niobate at elevated temperature

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