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EFFECT OF Li/Nb RATIO ON GROWTH AND SPECTROMETRIC CHARACTERIZATION OF Hf:Fe:LiNbO₃ CRYSTALS

LI DAI

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Applied Science College, Harbin University of Science and Technology, Harbin, Heilongjiang 150080, China

Corresponding author.

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SHI-PING WU

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

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JING-JIE GUO

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

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CHAO XU

Department of Applied Chemistry, Harbin Institute of Technology, Harbin, 150001, China

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YAN-QING SU

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

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YU-HENG XU

Department of Applied Chemistry, Harbin Institute of Technology, Harbin, 150001, China

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https://doi.org/10.1142/S0217984909019727Cited by:3 (Source: Crossref)

Abstract

Hf:Fe:LiNbO₃ crystals were grown by the Czochralski technique with various ratios of Li/Nb = 0.946, 1.05, 1.20 and 1.38 in the melt. The crystal composition and defect structure were analyzed by XRD, UV-Vis and IR spectroscopy. The results show that the threshold concentration of Hf in LiNbO₃ crystals decrease with the increasing of the Li/Nb ratio; when the Li/Nb ratio is 1.05, the threshold concentration of Hf is less than 2 mol%, largely under the threshold concentration of Hf ions in congruent Hf:Fe:LiNbO₃ crystal (4 mol).^1–3 With the increase of Li/Nb, Hf ions first replace the ; when the concentration of Hf ions is higher than the threshold value, Hf ions occurs on normal Nb and Li sites.