采用水热法,以固相烧结的化学计量比(2Bi2 O3∶3SiO2)的玻璃态Bi4Si3O12做培养料,以NaOH溶液为矿化剂,研究了在水热体系下形成Bi4Si3O12晶体的相区.结果发现,在生长温度为380 ～ 500℃,矿化剂浓度为1.5 ～4 mol/L时,自发成核生成的晶粒均为Bi4Si3O12和Bi12SiO20两种物相.通过在矿化剂溶液中外加一定量的SiO2,得到完全纯相的Bi4Si3O12,并生长出尺寸超过8 mm的Bi4Si3O12单晶.无论在矿化剂溶液中是否添加SiO2,生长的Bi4Si3O12都呈四面体形状,显露面以{112}面族为主,Bi4Si3O12晶体的这一结晶习性能够用周期性键链(PBC)理论予以解释.
参考文献
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