镥
等结构
铷
钇
硫化物
铊
晶体孪晶
铈
化学
钠
钆
结晶学
稀土元素
硫化钠
稀土
无机化学
钾
晶体结构
矿物学
微观结构
有机化学
氧化物
作者
Jan Fábry,Lubomír Havlák,Monika Kučeráková,Michal Dušek
标识
DOI:10.1107/s2053229614009607
摘要
The title structures NaGdS2 (sodium gadolinium sulfide), NaLuS2 (sodium lutetium sulfide) and NaYS2 (sodium yttrium sulfide) were redetermined in order to improve the structural information available for the family of group 1 and thallium rare earth sulfides, which are isostructural with the rhombohedral α-NaFeO2 structure type. In particular, the present investigation has been directed at the rhombohedral sodium rare earth sulfides. The observed dependence of the fractional coordinate z(S(2-)) on the identity of the rare earth element in the newly determined structures is in agreement with the known structures of the potassium and rubidium analogues. Crystals of NaGdS2 and NaLuS2 display obverse-reverse twinning.
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