Curie Temperature and Birefringence Variation in Ferroelectric Lithium Metatantalate as a Function of Melt Stoichiometry
Curie Temperature and Birefringence Variation in Ferroelectric Lithium Metatantalate as a Function of Melt Stoichiometry
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铁电偏钽酸锂的居里温度和双折射率随熔体化学计量变化的变化
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发表时间：
1967
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影响因子：
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通讯作者：
H. Brown
中科院分区：
文献类型：
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作者：
A. Ballman;H. Levinstein;C. D. Capio;H. Brown
偏钽酸锂的铁电居里温度与熔体化学计量比呈线性关系。在单晶上测量了从700°C到540°C的居里温度，对应于表观化学计量比两侧熔体组成约6摩尔%的变化。高居里温度发生在锂氧化物浓度较高时。从名义化学计量比熔体中生长的LiTaO_3的居里温度为618°±5°C。偏钽酸锂的双折射也是熔体组成的线性函数。测量了+0.006到-0.004的双折射值，并与上述与低居里温度相关的正双折射的熔体组成变化相对应。
The ferroelectric Curie temperature of lithium metatantalate is linearly dependent on the melt stoichiometry. Curie temperatures ranging from 700° to 540°C were measured on single crystals and correspond to a melt composition variation of approximately 6 mole % on each side of apparent stoichiometry. High Curie temperatures occur at high lithium oxide concentrations. The Curie temperature of LiTaO3 grown from a nominally stoichiometric melt is 618°± 5°C. The birefringence of lithium metatantalate is also a linear function of the melt composition. Birefringence values from +0.006 to –0.004 were measured and correspond to the melt composition variation described above with positive birefringence associated with low Curie temperatures.