硫酸钾铵混晶组成及特性研究

Phase Composition and Characteristics of Patassium Ammonium Sulphate Solid Solution

采用恒速冷却的方法首次制备出不同组分的[(NH_4)_(1-x)K_x]_2SO_4(0<x<1)单晶,并分别对固溶体晶体进行了XRD、XRSD、FTIR、SEM和TG-DTA表征,获得了晶胞参数、晶相组成及热物性规律。结果表明,制备得到硫酸钾铵和硫酸铵钾两类固溶体,其中硫酸钾铵单晶为四棱柱外形,硫酸铵钾单晶为六棱球外形;同时得到,同类固溶体晶体结构相似,但都属于正交晶系;随着NH+4浓度降低,热重损失减少,热稳定性增强。

The single crystal of [（ NH4）（1-x）Kx]2SO4 for different compositions were firstly grown by a method of constant cooling rate and characterized by XRD,XRSD,FTIR,SEM and TG-DTA.Corresponding cell parameters,the crystal phase composition and the regular of thermal property were determined. The results show that the grown single crystals were ammonium potassium sulfate and potassium ammonium sulfate,which were six arrises ball and quadrangular,respectively. The crystal structure of the same kind of solid solution were similar,but they all belong to orthorhombic; With the increase of concentration of NH4^＋ in the solid solutions,the thermal weight loss reduced and thermal stability increased.