碲酸盐氧卤玻璃具有低声子能以及较好的稳定性和析晶性能等优秀的综合品质,是一类很有前途的光学玻璃材料.采用熔融法制备了不同组成的TeO_2-Nb_2O_5-BaO-BaCl_2系统玻璃,研究了网络结构变化和组成对该系统玻璃的成玻璃性能和析晶性能的影响,同时探讨了向玻璃基体内引入银纳米晶体的可能性.结果表明,BaCl_2的引入使得玻璃网络结构中键合及基团种类增多,碲氧链间的连接加强,网络结构更加紧密,并且成玻璃区域有所扩展.TeO_2-Nb_2O_5-BaO-BaCl_2系统玻璃基体在保持自身结构稳定性的同时,更有利于AgCl纳米晶体析出,是一种适合金属纳米晶掺杂的优良光学玻璃基体材料.
With characters of low phonon energy and better stability and crystallization, oxyhalide glasses could be a good matrix for the birth of nano-crystals. The forming abilities and crystallizing properties of TeO_2-Nb_2O_5-BaO-BaCl_2 glasses were investigated by FTIR,DTA,UV-Vis,FESEM. The influences of composition and network on the crystallization of the glasses, which contribute to the studies of nanocrystal-doped tellurite optical glasses, were also discussed. It was found that when introducing BaCl_2 into tellurite glasses, the [TeO_4] units are increased, the Te-O chains are strengthened, the network are more tight, and the forming area are enlarged. Thus the glass forming ability and thermal stability of TeO_2-Nb_2O_5-BaO-BaCl_2 glasses are improved with introducing BaCl_2. TeO_2-Nb_2O_5-BaO-BaCl_2 glasses are also in favor of the crystallization of AgCl nanocrystals, which will become a new kind of nanocrystal-doped material.
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