Ferroelastic Multidomains in LaNbO4 Crystals

Shin Tsunekawa; Atsuo Kasuya; Yuichiro Nishina; Tsuguo Fukuda

doi:10.2320/matertrans1989.37.650

Ferroelastic Multidomains in LaNbO₄ Crystals

Shin Tsunekawa, Atsuo Kasuya, Yuichiro Nishina, Tsuguo Fukuda

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Keywords: lanthanum orthoniobate, ferroelasticity, incommensurate-commensurate phase transition, discommensuration, multidomain, micro domain, spontaneous strain, twinning deformation, shuffle, W’wall, cleavage, atomic force microscopy, polarizing optical microscopy, transmission electron microscopy

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1996 Volume 37 Issue 4 Pages 650-654

DOI https://doi.org/10.2320/matertrans1989.37.650

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Abstract

LaNbO₄ crystals show three lineal structures associated with domain formation under high-resolution polarizing optical microscope. One has a width of the order of 10 microns and the others are in order of 1 micron wide. The former is a large scale multidomain structure formed by twinning deformation due to monoclinic spontaneous strains below phase transition temperature and the latters are a small scale multidomain structure comming from discommensuration due to incommensurate-commensurate phase transition. Spacings of these multidomain structures are discussed on basis of experimental results and theoretical consideration.

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