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Czochralski Growth of Potassium Lithium Niobate Single Crystals with Low Li Content and Their Characterization
Author(s) -
Kim T.H.,
Kim Y.B.,
Kim J.N.,
Ro J.H.
Publication year - 2000
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 - 10.1002/1521-4079(200008)35:8<927::aid-crat927>3.0.co;2-6
Subject(s) - ferroelectricity , lithium niobate , potassium niobate , lithium (medication) , dielectric , potassium , materials science , crystal (programming language) , analytical chemistry (journal) , ion , single crystal , ionic bonding , infrared spectroscopy , mineralogy , crystallography , chemistry , optoelectronics , medicine , organic chemistry , chromatography , computer science , metallurgy , programming language , endocrinology
Single crystalline and crack free potassium lithium niobate (KLN) single crystals with low Li content were grown by the Czochralski method. The crystal composition can be written as K 2.60 Li 1.17 Nb 5.44 O 15 (=K 2.95 Li 1.33 Nb 6.17 O 17 ) which contain relatively fewer Li ions than ferroelectric K 3 Li 2 Nb 5 O 15 crystals. All experimental results show that the deficiency of the Li ions in the KLN crystals strongly influences their physical properties. Especially, the as‐grown crystals do not indicate any signature for a ferroelectric phase transition in contrast to the ferroelectric K 3 Li 2 Nb 5 O 15 crystals. However, due to ionic conduction, the temperature dependence of the dielectric constant of such KLN‐2 crystals show a broad anomaly near 300°C. In addition, the existence of proton defects can be revealed by infrared absorption spectroscopy near 3500 cm ‐1 in as‐grown crystals.