Bridgman Growth of 4-Inch-Diameter Li2B4O7 Single Crystals

Abstract

Abstract: High-quality and large size Li₂B₄O₇ single crystals were grown by the modified vertical
Bridgman technique. Polycrystalline Li₂B₄O₇ powders were synthesized as raw materials and 3-inch-diameter LBO single crystal
was used as seed. The growth speed was less than 0.3mm/h and the temperature gradient in solid-liquid interface was about 30℃/cm.
Twin-free, core-free and inclusion-free LBO single crystals with 105mm in diameter and 120mm in length were grown successfully. The formation and
elimination of cracks, twins and inclusions were investigated. SAW properties of as-grown LBO crystals measured are as follows: dielectric
constant ε₁₁=9.33, piezoelectric constant d₃₃=0.94C/m² and coupling coefficient k₃₃=0.42.

Key words: piezoelectric crystal, lithium tetraborate, Bridgman technique, crystal growth

CLC Number:

O738

XU Jia-Yue,FAN Shi-Ji,HUA Wang-Xiang. Bridgman Growth of 4-Inch-Diameter Li₂B₄O₇ Single Crystals[J]. Journal of Inorganic Materials.

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Bridgman Growth of 4-Inch-Diameter Li₂B₄O₇ Single Crystals

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