PrCl_3-SrCl_2MgCl_2三元体系相图的研究

借助于DTA研究了PrCl_3.-SrCl_2.-MgCl_2.三元体系相图.发现本体系内有对应于PrCl_3,SrCl_2,MgCl_2.和Sr_3PrCl_9.的四个液相面、五条两次结晶线、一个三元低共熔点E(25.0wt%PrCl_3,41.5wt%SrCl_2,33.5wt%MgCl_2;538℃)和三元转熔点P(23.0wt%PrCl_3,43.5wt%SrCl_2,33.5wt%MgCl_2;544℃).体系内有两个四相平衡反应为:

LaCl_3－SrCl_2－MgCl_2三元体系相图

本文借助于ＤＴＡ和Ｘ射线结构分析测定了ＬａＣｌ_３－ＳｒＣｌ_２－ＭｇＣｌ_２三元体系相图，发现它属简单低共熔型，体系内有对应于ＬａＣｌ_３、ＳｒＣｌ_２和ＭｇＣｌ_２的３个液相面、３条２次结晶线和１个三元低共熔点Ｅ（１５．０ｗｔ％ＬａＣｌ_３，４９．５ｗｔ％ＳｒＣｌ_２，３５．５ｗｔ％ＭｇＣｌ_２；５４５℃），并且在固相下有一个不稳定的化合物生成，在约５００℃时分解。

NdCl_3－SrCl_2－MgCl_2三元体系相图的研究

借助于ＤＴＡ研究了ＮｄＣｌ３－ＳｒＣｌ２－ＭｇＣｌ２三元体系相图．发现体系内有对应于ＮｄＣｌ３、ＳｒＣｌ２、ＭｇＣｌ２和Ｓｒ３ＮｄＣｌ９的四个液相面、五条二次结晶线、一个三元低共熔点Ｅ（２７．０ｗｔ．％ＮｄＣｌ３．４２．５ｗｔ．％ＳｒＣｌ３，３０．５ｗｔ．％ＭｇＣｌ２；５２６℃）和三元转熔点Ｐ（２４．０ｗｔ．％ＮｄＣｌ３，４４．５ｗｔ．％ＳｒＣｌ２，３１．５ｗｔ．％ＭｇＣｌ２；５３２℃）．体系内有两个四相平衡反应为：ＡＬＮｄＣｌ３＋ＭｇＣｌ２＋Ｓｒ３ＮｄＣｌ９Ｌ＋ＳｒＣｌ２ＭｇＣｌ２＋Ｓｒ３ＮｄＣｌ９同时探讨了相图的若干规律。

MoO_3、NiO、ZnO在小表面金红石上的分散行为

Dispersion of MoO3, NiO, ZnO on rutile TiO2 with low specific surface area wasstudied with Mercury Porosimeter, SEM, XPS and Ammonia Extraction method. The dispersionthresholds of MoO3, NiO, ZnO on three rutile TiO2 carriers were obtained with XPS, and com-pared with those on anatase TiO2 with high specific surf are area. Ammonia Extraction methodwas used to identify the surface oxide species interarting with support surface in different strengthand it was found that the proportions of oxides that can not be extrarted by ammonia extractionare different for MoO3, NiO and ZnO which are supported on rutile TiO2.