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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >The role of second coordination-sphere interactions in incommensurately modulated structures, using beta-K5Yb( MoO4)(4) as an example
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The role of second coordination-sphere interactions in incommensurately modulated structures, using beta-K5Yb( MoO4)(4) as an example

机译:以β-K5Yb(MoO4)(4)为例,第二个协调球相互作用在不适当调节的结构中的作用

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摘要

The incommensurate palmierite-like structure of beta-K5Yb(MoO4)(4), potassium ytterbium tetramolydate, has been refined in the (3 + 1)- dimensional monoclinic superspace group X2/m(0 rho 0) 00, with X = [0 0 0 0; 1/2 1/2 0 0; 0 0 1/2 1/2; 1/2 1/2 1/2 1/2] and the unit-cell parameters a = 10.4054 (16), b = 6.1157 (12), c = 19.7751 (18) angstrom, beta = 136.625 (10)degrees; q = 0.6354 (30) b*. The occupations of the K and Yb atomic positions are described by crenel functions. The structure model reveals a balanced interaction between the atoms of the first and second coordination spheres. It is shown that the third coordination sphere should not be neglected in studies of modulated structures. The ordering of the K and Yb atoms appears to be the driving force for the modulation of all the other atoms.
机译:β-K5Yb(MoO4)(4)(四钼酸钾)的不相称的堇青石状结构已在(3 +1)维单斜超空间群X2 / m(0 rho 0)00中进行了精制,其中X = [ 0 0 0 0; 1/2 1/2 0 0; 0 0 1/2 1/2; 1/2 1/2 1/2 1/2],晶胞参数a = 10.4054(16),b = 6.1157(12),c = 19.7751(18)埃,β= 136.625(10)度; q = 0.6354(30)b *。 K和Yb原子位置的职业由crenel函数描述。结构模型揭示了第一和第二配位球原子之间的平衡相互作用。结果表明,在调制结构的研究中不应忽略第三协调领域。 K和Yb原子的排序似乎是调制所有其他原子的驱动力。

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