Eu^(3+)激活的La_2Na_2Sr_6(PO_4)_6Br_2和Y_2Na_2Ca_6(PO_4)_6F_2晶体中的发光中心

Luminescent Center in Eu^(3+)-Activated La_2Na_2Sr_6(PO_4)_6Br_2 and Y_2Na_2Ca_6(PO_4)_6F_2 Crystals

采用高温固相法合成了La_2Na_2Sr_6(PO_4)_6Br_2和Y_2Na_2Ca_6(PO_4)_6F_2。X射线衍射分析证明它们都为单一物相。用Sr_(10)(PO_4)_6Br_2和Ca_(10)(PO_4)_6F_2同晶指标化法进行指标化,结果表明:它们都属六方晶系的磷灰石结构,空间群为P6_3/m。计算了它们的晶胞参数。以Eu^(3+)做结构探针,研究了Eu^(3+)所处晶格的点对称性。研究表明:在La_2Na_2Sr_6(PO_4)_6Br_2中Eu^(3+)占据4f格位,为C_3点群,而在Y_2Na_2Ca_6(PO_4)_6F_2中Eu^(3+)处于6h格位,为C_6点群。

La,Na2Sr6(PO4)6Br2:Eu3+ and Y2Na2Ca0(PO4)6F2:Eu3+ were synthesized by solid state reactions at high temperature. The crystalline structure of undoped matrix compounds have been determined by indexing lattice planes with analogous crystals of apatite type with space group P63/m.Eu3+ ions were determined by the luminescent probe method. to be located on 4f site of C3 point symmetry in La2Na2Sr4(P04),Br2 and on 6h site of C8 point symmetry in Y2Na2Ca6(PO4)6(PO4)6F2.