对提拉法生长的钼酸钆晶体进行了从常温(25℃)到高温(1127℃)的喇曼光谱测试和分析,由实验得出:随着温度的不断升高,晶体的喇曼谱峰向低频移动(159℃相变点除外),且总的趋势是向一起靠拢,位置相近的谱峰合并或趋于合并,这说明随着温度的升高晶体结构不断变化-晶体中三种MoO4四面体的结构逐渐趋于一致.用经验关系式υ(cm-1)=32895exp(-2.073r),由实验测得的晶体在不同温度下的喇曼伸缩振动频率值估算了相应温度下晶体中MoO4四面体的Mo-O键的键长值,明显看出,随着温度的升高,各不同的四面体的键长值趋于一致,从而定量估算出晶体结构随温度的变化情况.
参考文献
| [1] | Kaminskii A A;Butashin A V;Eichler H J et al.Orthorhombic Fe rroelectric and Ferroelastic Gd2(MoO4)3 Crystal-a New Many-purposed Nonl inear and Optical Material：Efficient Multiple Stimulated Raman Scattering and C W and Tunable Second Harmonic Generation[J].Optical Materials,1997,7(07):59-73. |
| [2] | 袁清习,赵春华,殷晓峰,罗卫平,徐军,潘守夔.β′-钼酸钆晶体的生长与畴结构观察[J].人工晶体学报,2001(03):273-279. |
| [3] | 孙会芳,余曰丙鲲,侯怀宇,尤静林,蒋国昌,袁清习,潘守夔.钼酸钆晶体的结构及喇曼光谱研究[J].上海大学学报(自然科学版),2001(04):374-376. |
| [4] | Wolfgang Jeitschko .A Comprehensive X-ray Study of the Ferroelectric-fe rroelastic and Paraelectric-paraelastic Phases of Gd2(MoO4)3[J].ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE,1972(28):60-76. |
| [5] | Megumi K;Yumoto H .Study of Structrue and Phase Transition of Gadolinium Molybdate[J].Materials Research Bulletin,1974,9:391-400. |
| [6] | Sheik S;Saleem;Aruldhas G .Normal Modes of the MoO2-4 Ion in Tb1.8Eu0.2(MoO4)3 Single Crystal.[J].Journal of Solid State Chemistry,1983(48):77-85. |
| [7] | Franklin D;Hardcastle .Determination of Molybdenum-oxygen Bond Distances and Bond Orders by Raman Spectroscopy[J].Journal of Raman Spectroscopy,1990,21:683-691. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%