熔化温度对PbBr_2-PbCl_2-P_2O_5系玻璃的影响

Synthesis and Characterization of the PbBr_2-PbCl_2-P_2O_5 Glasses with Different Melting Temperature

为了研究熔化温度对 Pb Br2 - Pb Cl2 - P2 O5 系玻璃的影响 ,探索了在 5 30～ 5 40℃熔化时 Pb Br2 - Pb Cl2 - P2 O5 系统的玻璃形成区 ,并且测试了一些玻璃的特性温度、密度、化学成分和红外光谱。结果表明 ,提高熔化温度后 ,Pb Br2 - Pb Cl2 -P2 O5 系统玻璃具有更宽的玻璃形成区 ,向 Pb Br2 一侧延伸 ;玻璃转变温度升高到 2 0 0℃以上 ,密度提高到 5 .5 1g·cm- 3。熔化过程中化学成分的变化导致了玻璃性质的变化 ,提高熔化温度后 ,NH4H2 PO4分解更加完全 ,使得玻璃中残存的 HO-和 N H+ 4 减少。红外光谱的测试结果表明提高熔化温度后 ,NH4H2 PO4完全分解 ,玻璃中已不存在 HO-和 N H+ 4 。

A series of PbBr 2 PbCl 2 P 2O 5 glasses were prepared and characterized to research the effect of melting temperature on the properties of glasses The glass forming regions were explored and the stability of the glasses against crystallization studied The density, characteristic temperatures, chemical analysis compositions, and infrared absorption spectra of the glasses were measured The results show that the PbBr 2 PbCl 2 P 2O 5 ternary system melted at 530～540℃ has a broader glass forming region which extended to the side of PbBr 2 than that melted at 450～470℃ The density of PbBr 2 PbCl 2 P 2O 5 glasses can be up to 5 51 g·cm -3 with a T g of 200℃ Glasses melted at 450～470℃ contain a large amount of hydroxyl and ammonium because of the uncompleted decomposition of NH 4H 2PO 4 When the melting temperature is increased to 530～540℃, the absence of the hydroxyl and ammonium increases both the glass transition temperature and the density The results of infrared absorption spectra show that the decomposition of NH 4H 2PO 4 of some glasses melted at 530～540℃ is more complete than that of glasses melted at 450～470℃