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用一步合成法对ＣｓｘＲｂ１－ｘＹｂＩ３体系进行了全组成范围内的合成，采用差热分析和Ｘ射线粉末相分析法制作了相图，用体系的荧光光谱进一步验证了相图的可靠性．该体系形成一个既有包晶反应又有类低共熔反应的有限固溶体，包晶反应温度和类低共熔反应温度分别为６２７℃和３７１℃．相分析确定了ＲｂＹｂＩ３高温相及三类固溶体的结构：０≤ｘ≤０．５形成以ＲｂＹｂＩ３为基的ＮＨ４ＣｄＣｌ３型固溶体和以ＲｂＹｂＩ３高温相为基的ＣａＩｒＯ３型固溶体，０．７５≤ｘ≤１．０形成以ＣｓＹｂＩ３为基的ＧｄＦｅＯ３型固溶体．
The synthesis of CsxRb1-xYbI3 system was carried out in a full range by one-step synthesis. The phase diagram was prepared by differential thermal analysis and X-ray powder phase analysis. The system’s fluorescence spectra were used to further verify the reliability of the phase diagram. The system forms a limited solid solution with both peritectic reaction and eutectic reaction. The peritectic reaction temperature and the eutectic reaction temperature are 627 ℃ and 371 ℃, respectively. Phase analysis identified the high temperature phase RbYbI3 and the structure of three types of solid solution: 0≤x≤0.5 to form RbYbI3 based NH4CdCl3 type solid solution and RbYbI3 high temperature phase based CaIrO3 type solid solution, 0.75≤x≤1. 0 GdFeO3 type solid solution based on CsYbI3 is formed.