等结构
结晶学
铷
晶体结构
铯
Atom(片上系统)
群(周期表)
热重分析
相(物质)
材料科学
粉末衍射
化学
无机化学
冶金
钾
有机化学
嵌入式系统
计算机科学
作者
Sheng Jin,M Li,Jiangang Guo,Wang Wy,YP Xu,XL Chen
出处
期刊:Powder Diffraction
[Cambridge University Press]
日期:2010-09-01
卷期号:25 (S1): S2-S6
被引量:1
摘要
Two carbonates Cs 2 Sr 2 (CO 3 ) 3 and Rb 2 Sr 2 (CO 3 ) 3 were synthesized by solid-state reaction at high temperatures, and their crystal structures were determined from X-ray powder diffraction data. Because of the presence of heavy atoms and heavy peak overlapping, proper restrains on light-atom groups were found essential to obtain satisfactory results. The title compounds are isostructural to an early reported compound Cs 2 Ba 2 (CO 3 ) 3 and crystallize in cubic space group I 2 1 3, with unit-cell dimensions a =10.072 64(2) Å for the cesium phase and a =9.855 56(7) Å for the rubidium phase. Unlike most carbonates, the title compounds feature in mutually perpendicular CO 3 atomic groups. Our results also indicate that the global instability index is a more sensitive parameter in evaluating the structure rationality over the agreement factors. Moreover, differential thermal analysis and thermogravimetric analysis measurements reveal that Cs 2 Sr 2 (CO 3 ) 3 and Rb 2 Sr 2 (CO 3 ) 3 are stable in air up to 796 and 880 °C, respectively.
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