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INFLUENCE OF Mg²⁺ IONS DOPING ON THE STRUCTURE, MORPHOLOGY AND PHASE TRANSITION OF LiIO₃ CRYSTAL

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China

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YUPING SUN

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China

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W. C. CHEN

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China

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X. L. CHEN

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China

Corresponding author.

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, and

L. N. ZHU

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China

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https://doi.org/10.1142/S0217979207037910Cited by:3 (Source: Crossref)

Abstract

The influence of different concentrations of Mg²⁺ ions doping on the structure, morphology and phase transition of LiIO₃ crystal was investigated. The best Mg²⁺-doped alpha-lithium iodate (Mg:α-LiIO₃) crystals for potential optical applications can be successfully grown by the aqueous solution method when the concentration of Mg²⁺ ions in the initial mother solutions C_m< 0.001 M. Chemical component analysis shows the Mg:α-LiIO₃ crystal is a new system with the segregation coefficient k>1. The polarized Raman results are consistent with our conclusions that the Mg²⁺ ion substitutes for the host Li⁺ cation in the pure α-LiIO₃ crystals and results in the corresponding cation vacancies. As C_m increases, inclusions, spontaneously crystalline grains, β phase of LiIO₃ and hillock-shape Mg:α-LiIO₃ crystals are induced respectively by different concentrations of Mg²⁺ ions doping under the same crystal growth conditions. When C_m>0.1 M, the polarized Raman results indicate that larger amounts of Mg²⁺ ions incorporated inhibit LiIO₃ growth and result in the hillock-shape morphology by destabilizing the crystal lattice and inducing lattice distortion.

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