Crystal structure of the pyrochlore oxide superconductor KOs2O6
Crystal structure of the pyrochlore oxide superconductor KOs2O6
复制标题
烧绿石氧化物超导体KOs2O6的晶体结构
DOI：
10.1016/j.jssc.2005.10.039
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发表时间：
2005
影响因子：
3.3
通讯作者：
Z. Hiroi
中科院分区：
文献类型：
--
作者：
J. Yamaura;S. Yonezawa;Y. Muraoka;Z. Hiroi
本文报道了烧绿石氧化物超导体KOs_2O_6的单晶X射线结构分析。其结构被鉴定为β-烧绿石结构，空间群为Fd 3 <$m，晶格常数a=10.089（2）K：K原子位于8b位，而不是传统烧绿石氧化物的16 d位。在300 K时，K阳离子的原子位移参数Uiso=0.0735（8）Ω 2，这表明K阳离子与超大的Os 12 O 18笼的弱结合表现出强烈的振动，正如最近在笼形化合物中观察到的那样. A阳离子的振动是β-烧绿石氧化物超导体AOs 2 O 6系列（A=Cs、Rb和K）的共同特征，并且对于最小的K阳离子来说振动最大。
We report the single-crystal X-ray analysis of the structure of the pyrochlore oxide superconductor KOs2O6. The structure was identified as the β-pyrochlore structure with space group Fd3¯m and lattice constant a=10.089(2)Å at 300K: the K atom is located at the 8b site, not at the 16d site as in conventional pyrochlore oxides. We found an anomalously large atomic displacement parameter Uiso=0.0735(8)Å2at 300K for the K cation, which suggests that the K cation weakly bound to an oversized Os12O18cage exhibits intensive rattling, as recently observed for clathrate compounds. The rattling of A cations is a common feature in the series of β-pyrochlore oxide superconductors AOs2O6(A=Cs, Rb and K), and is greatest for the smallest K cation.
β-烧绿石氧化物超导体KOs_2O_6比热的第二个异常
DOI：
--
发表时间：
2005
期刊：
J.Phys.Soc.Jpn. 4
影响因子：
--
作者：
Z.Hiroi;S.Yonezawa;J.Yamaura;T.Muramatsu;Y.Muraoka
通讯作者：
Y.Muraoka