掺杂KZnF_3：Cr^（3＋）激光晶体K~＋空位三角晶场参量研究

An Investigation of the Trigonal Crystal Field Parameters of the K +-Vacancy for Cr 3+ Doped KZnF 3 Laser Crystal

用Ｎｅｗｍａｎ的叠加模型研究了ＫＺｎＦ３：Ｃｒ３＋晶体Ｃｒ３＋—Ｋ＋空位的三角晶场参量。研究表明，晶格畸变对晶场的贡献不可忽略，进一步证实了晶格畸变：Ｃｒ３＋离子上方三个Ｆ－离子和Ｃｒ３＋离子下方三个Ｆ－离子分别偏离〔１１１〕晶轴２．６６１°和－１．

In this papar,the trigonal crystal field parameters of the Cr 3+ -K + vacancy in KZnF 3:Cr 3+ have been studied using the Newman superposition model.It is indicated that contribution from the crystal lattice distortion is non-negligible.Further,the existence of crystal lattice distortion which the front F-of the Cr 3+ rotate 2.661° away from 111 axis while the back F - rotate 1.149° toward it has heen verified.