无机材料学报

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铌酸锂晶体化学键性质研究

高发明   

  1. 燕山大学材料化工学院, 秦皇岛 066004
  • 收稿日期:2000-02-15 修回日期:2000-03-06 出版日期:2001-01-20 网络出版日期:2001-01-20

Investigation of Bond Properities in LiNbO3

GAO Fa-Ming   

  1. College of Materials Science and Chemical Engineering; Yanshan University; Qinhuangdao 066004; China
  • Received:2000-02-15 Revised:2000-03-06 Published:2001-01-20 Online:2001-01-20

摘要: 利用平均能带模型研究了LiNbO晶体化学键性质,结果表明,铌氧键的共价性为0.2;锂氧键的共价性为0.42.利用由共价性和极化率定义的化学环境因子计算LiNbO中Cr3+的Racah参数和LiNbO中Fe2+的穆斯堡尔同质异能位移均与实验值一致。

关键词: LiNbO3, 化学键, Racah参数, 穆斯堡尔同质异能位移

Abstract: By using the average bond-gap model, chemical bond properities of LiNbO3 were studied. Calculated results showed that covalency of Nb-O bond was 0.2, and of Li-O bond 0.42. Racah parameter of Cr3+ ion and Mossbauer isomer shifts of Fe2+ ion in LiNbO3 were calculated by using the chemical surrounding factor, h, definited by covalency and electronic polarizability,and the results agreed with the experimental values.

Key words: LiNbO3, chemical bond, racah parameters, mossbauer isomer shifts

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