Li_(2)SO_(4)-MgSO_(4)及LiNO_(3)-Mg(NO3)2熔盐体系的研究

A STUDY ON THE BINARY SALTS SYSTEMS Li_(2)SO_(4)-MgSO_(4) AND LiNO_(3)-Mg(NO3)2

用目测变温法和差热分析法研究了Li_(2)SO_(4)-MgSO_(4)、LiNO_(3)-Mg(NO_(3))2熔盐体系。在前一体系中有固液异组成化合物Li_(2)SO_(4)·2MgSO_(4)生成,它在832°熔化分解。化合物与Li_(2)SO_(4)间形成低共熔点,温度为647℃,组成含MgSO_(4)23.6Wt%。Li_(2)SO_(4)多晶转变点575℃,在加入MgSO_(4)后形成类低共熔点,温度552℃,组成含MgSO_(4)4.2%。LiNO_(3)-Mg(NO_(3))2为一简单低共熔体系,共晶点含Mg(NO_(3))247.3%,温度200℃。

A study has been made of the binary salts systems Li_(2)SO_(4)-MgSO_(4) and LiNO_(3)-Mg(NO_(3))2 by the visual polythermal and DTA methods.An incon-gruently melting compound Li_(2)SO_(4)·2MgSO_(4) occurring at 832°C was found in the Li 2SO_(4)-MgSO_(4) system.The eutectic point between Li3SO_(4) and Li_(2)SO_(4)·2MgSO_(4) occurring at 647°C lies in the composition of 23.6 Wt%MgSO_(4).The values of eutectoid are 4.2%MgSO_(4) and at 552°C.The system LiNO_(3)-Mg(NO_(3))2 is of a simple eutectic type,the eutectic point occurring at 200°C contains 47.3%Mg(NO_(3))2.No solid solution existed on the both sides of LiNO_(3) and Mg(NO_(3))2.