Evolution of a ferroelastic domain structure in an incommensurate phase of barium sodium niobate (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Ba</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">NaNb</mi></mrow><mrow><mn>5</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>15</mn></mrow></msub></mrow></math>)

S. Mori; N. Yamamoto; Y. Koyama; Y. Uesu

doi:10.1103/PhysRevB.52.6158

Evolution of a ferroelastic domain structure in an incommensurate phase of barium sodium niobate ( ${Ba}_{2}$ ${NaNb}_{5}$ $O_{15}$ )

S. Mori, N. Yamamoto, Y. Koyama, and Y. Uesu

Phys. Rev. B 52, 6158 – Published 1 September 1995

Abstract

Features of a ferroelastic domain structure in an incommensurate phase of barium sodium niobate [ ${Ba}_{2}$ ${NaNb}_{2}$ $O_{15}$ (BSN)] that appear in the cooling process were investigated by means of a transmission electron microscope. The in situ observation revealed that there exists an abrupt change in the domain structure around 503 K. The ferroelastic domain structure above 503 K basically consists of two types of 1q ferroelastic microdomains with a size of about 20 nm while below it large ferroelastic domains with flat domain boundaries are formed.

Received 11 May 1995

DOI:https://doi.org/10.1103/PhysRevB.52.6158

Authors & Affiliations

S. Mori and N. Yamamoto

Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152, Japan

Y. Koyama

Kagami Memorial Laboratory for Materials Science and Technology, Advanced Research Center for Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169, Japan

Y. Uesu

Advanced Research Center for Science and Engineering, and Department of Physics, Waseda University, Shinjuku-ku, Tokyo 169, Japan

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Vol. 52, Iss. 9 — 1 September 1995

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Physical Review B

covering condensed matter and materials physics