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Physical properties of single crystals of KTiPO 4 , K x Rb 1− x TiOPO 4 ( x = 0.85; 0.75), KGeOPO 4 and KTiOAsO 4
Author(s) -
Haussühl S.,
Luping Shi,
Baolin Wang,
Jiyang Wang,
Liebertz J.,
Wostrack A.,
Fink Ch.
Publication year - 1994
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170290424
Subject(s) - tetragonal crystal system , crystal twinning , thermoelastic damping , materials science , polar , anisotropy , piezoelectricity , dielectric , refractive index , crystallography , single crystal , etching (microfabrication) , condensed matter physics , thermal , analytical chemistry (journal) , optics , chemistry , crystal structure , thermodynamics , microstructure , composite material , physics , optoelectronics , layer (electronics) , astronomy , chromatography
Single crystals of the title compounds of optical quality and dimensions up to 30 × 25 × 25 mm were grown by the flux method. During the growth process the formation of twins consisting of bicrystals was observed, even in the case of single‐crystalline seeds. The twinning boundaries could be detected by etching with hot KOH solutions. The following physical properties were investigated: refractive indices, dielectric constants, thermal expansion, piezoelectric, and electrooptic effects, elastic and thermoelastic constants. The crystals exhibit a quite similar behaviour. The anisotropy of all properties is quasi‐tetragonal. In respect to polar properties only small differences within the mixed crystals K x Rb 1– x TiOPO 4 are found. Replacement of P by As does only slightly affect the polar properties, whereas the replacement of Ti by Ge leads to a drastic reduction of polar effects.