LnMgB_5O_（10）：Mn^（2＋）（Ln＝La，Gd，Y，Ce）体系中Mn^（2＋）的双重谱与配位场参数

DOUBIE-SPECTRA AND LIGAND FIELD PARAMETERS OF Mn￣(2+) IN LnMgB_5O_(10):Mn(2+)(Ln=La,Gd,Y,Ce)

研究了ＬｎＭｇＢ５Ｏ（１０）：Ｍｎ（２＋）（Ｌｎ＝Ｌａ，Ｇｄ，Ｙ，Ｃｅ）体系中稀土离子对Ｍｎ（２＋）的双重谱的影响．从理论上计算了Ｍｎ（２＋）的离子能级和配位场参数，论述了双重谱的成因，理论分析与实验结果较为吻合．

On U V excitation,Mn2+ in LnMgB5O10(Ln=La, Gd,Y,Ce)system yields tow types of emission,viz.double-spectra are observed.In LnMgB5O10,replacement of Ln by La,Gd,Y or Ce leads to change intensity and distribution in Mn2+ double-spectra.In LaGdCeMgB5O10:Mn2+,emission at 622 urn corresponds to T1g-6A 1g transition in distorted octahedron cubic field,emission at 594 urn corresponds to T1-6 A1 transition in non cubic field.Energy levels of Mn2+in LaGdCeMgB5O10 Mn2+and ligand field parameters for the cases of cubic and non-cubic field have been calculated and the results based on these are discussed.