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计算PbO—Bi_2O_3—Nb_2O_5系化合物的声光品质因数M_2在14—19范围,可与PbO·MoO_3相比,故选择此系统作为开拓新声光材料的研究对象。 用X-射线相分析、电子探针、差热分析等手段,确定了一个新的化合物,其组成为3PbO·Nb_2O_5:Bi_2O_3=20:1(mole),属3PbO·Nb_2O_5—Bi_2O_3膺二元系中一稳定化合物,采用熔剂法生长了外形为六角形、深桔色的透明片状单晶。用透射Laue、Weissenberg照相及四园衍射仪,对其结晶学特征进行了研究。
The calculation of the sound-light quality factor M 2 of PbO-Bi_2O_3-Nb_2O_5 compounds in the range of 14-19 can be compared with that of PbO.MoO_3. Therefore, this system was selected as the research object to develop new acousto-optic materials. A new compound with 3PbO · Nb 2 O 5: Bi 2 O 3 = 20: 1 (mole) and 3PbO · Nb 2 O 5 -Bi 2 O 3 was obtained by X-ray phase analysis, electron probe and differential thermal analysis In a stable compound, the flux method for the growth of hexagonal shape, dark orange transparent single crystal. The crystallographic characteristics of Laue, Weissenberg and four-garden diffractometer were studied.