GdOBr∶Eu晶场参数与自由离子参数的高压研究

在GdoBr∶Eu的常压和高压荧光谱实验数据基础上，对晶场能级及其重心进行了拟合计算，得到了晶场参数和自由离子参数（Slater参数和自旋 轨道耦合参数）在高压下的变化情况．计算结果表明，随压力增大，晶场参数B⁴₀，B⁶₀增大，B⁶₄减小，B²₀，B⁴₄的变化有些起伏．晶场强度在8GPa以 关键词：

HIGH PRESSURE STUDY ON CRYSTAL FIELD PARAMETERS AND FREE ION PARAMETERS FOR GdOBr∶Eu

Simulation of crystal field levels and the barycenters are conducted, based on the fluorescence spectra of GdOBr∶Eu under ambient and high pressures. Calculated results are concide with experimental results very well. Variations of Slater and spin-orbit parameters with pressure are obtained. With pressure increasing, B⁴₀,B⁶₀ increase, B⁶₄ decreases, and B²₀ and B⁴₄ show some what fluctuating variations. Strength of the crystal field decreases with increasing pressure from 0GPa to about 8GPa, then increases slightly until 12GPa. Variation of spin-orbit parameter is similar to that of crystal field strength. Slater parameters E_i(i=1—3) show different variations for different i under pressures. E₁∶E₂∶E₃ is little short of the value of hydrogenic ratio, but varies slightly with increasing pressure. To reveal physical significance in the variations of these parameters, comparison with variations with different hosts are made.