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Title: Temperature evolution of domains in potassium niobate single crystals
Authors: Lian, L. 
Chong, T.C. 
Kumagai, H.
Hirano, M.
Taijing, L. 
Ng, S.C. 
Issue Date: 1-Jul-1996
Citation: Lian, L.,Chong, T.C.,Kumagai, H.,Hirano, M.,Taijing, L.,Ng, S.C. (1996-07-01). Temperature evolution of domains in potassium niobate single crystals. Journal of Applied Physics 80 (1) : 376-381. ScholarBank@NUS Repository.
Abstract: The behavior of domain walls in KNbO3 single crystals with temperature variation from room temperature to 300 °C has been investigated in situ by a heating visualization system. It has been observed that domain walls show active behavior in a small temperature range from the phase transition temperature of 225 °C, the range being about 10 °C in the orthorhombic phase and 15 °C in the tetragonal phase. The 90° domain walls are generated randomly and extend themselves rapidly within the crystal in high density. The 60° domain walls, which are only observed in orthorhombic phase, do not appear randomly but are formed along the boundary of intersecting 90° domain walls. The results suggest that the 90° domain walls are most likely caused by microdefects within the crystal, and that dislocations at the junction of intersecting 90° domain walls supply nucleation sites for the 60° domain walls. © 1996 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
Appears in Collections:Staff Publications

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