PbO-Bi_2O_3-B_2O_3系统玻璃中B^(3+)离子的配位状态

Coordination Status of the B 3+ Ions in the PbO Bi 2O 3 B 2O 3 Glasses

利用红外光谱和喇曼光谱研究了ＰｂＯ－Ｂｉ２Ｏ３－Ｂ２Ｏ３系统玻璃结构中Ｂ３＋离子的配位状态．研究结果表明：当Ｂ２Ｏ３含量较低时，获得的重金属氧化物玻璃结构中的Ｂ３＋离子以单个［ＢＯ３］三角体形式存在，随Ｂ２Ｏ３含量增加，部分［ＢＯ３］三角体转变成［ＢＯ４］四面体；当Ｂ２Ｏ３含量增加到一定程度时，通过［ＢＯ３］三角体与［ＢＯ４］四面体之间的桥氧离子的联接而形成含［ＢＯ３］三角体与［ＢＯ４］四面体的环状结构．

The coordination status of the B 3+ ions in the PbO Bi 2O 3 B 2O 3 glasses was investigated by using the IR absorption and the Raman shift methods.The results show that,when the B 2O 3 content is lower than about 22.64 mol%,the B 3+ ions exist in the PbO Bi 2O 3 B 2O 3 glasses in the single triangles;and the single triangles transform into tetrahedra with the increasing of B 2O 3 content,which results in the decreasing of the amounts;and when the B 2O 3 content is added to about 46 mol%,the boron oxygen rings are formed by the connecting of the bridge oxygen ions between the triangles and the tetrahedra.