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Inhomogeneity of composition in near‐stoichiometric LiNbO 3 single crystal grown from Li rich melt
Author(s) -
Gao L.,
Wang J. Y.,
Liu H.,
Hu X. B.,
Yao S. H.,
Wu J. B.,
Qin X. Y.,
Boughton R. I.
Publication year - 2006
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.200510583
Subject(s) - stoichiometry , differential scanning calorimetry , crystal (programming language) , lithium niobate , analytical chemistry (journal) , volatilisation , crystal growth , homogeneity (statistics) , single crystal , materials science , lithium (medication) , chemistry , mineralogy , crystallography , chromatography , thermodynamics , organic chemistry , medicine , physics , statistics , optoelectronics , mathematics , computer science , programming language , endocrinology
A near‐stoichiometric LiNbO 3 single crystal has been grown by the Czochralski technique from a melt of 58.5 mol% Li 2 O. Its composition homogeneity was assessed by measuring the UV absorption edge. It was found that the maximum composition difference is about 0.03 mol% in the radial direction and 0.05 mol% in the axial direction. Differential scanning calorimetry (DSC) analysis was performed on the powder from the synthesized raw material and the frozen melt after crystal growth. The analytical results indicate that, during crystal growth, the magnitude of lithium volatilization from the melt surface is more than the degree of segregation from the crystal. The volatilized lithium diffuses into the crystal to compensate for the lithium segregation in the LiNbO 3 crystal. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)