首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Tennantite: multi-temperature crystal structure, phase transition and electronic structure of synthetic Cu_(12)As_4S_(13)
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Tennantite: multi-temperature crystal structure, phase transition and electronic structure of synthetic Cu_(12)As_4S_(13)

机译:鸟网:多温晶体结构,相变和合成Cu_(12)AS_4S_(13)的电子结构

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摘要

The structure of synthetic tennantite Cu_(12)As_4S_(13) was investigated at various temperatures in the 90-293 K range. It crystallizes in space group I4-bar3m. No structural transformation was observed in this temperature range. The structures were refined in anharmonic approximation for atomic displacements and electron density maps were refined using the maximum entropy method. Both approaches indicate a noticeable static disorder of the copper atoms in the triangular sulfur coordination and neighbouring site at high temperatures, whereas these split copper sites are well defined at lower temperatures. One particle potential is used to describe the behaviour of atoms at these copper sites. Such behaviour may be the structural reason for changes in magnetic properties.
机译:在90-293k范围内的各种温度下研究了合成鸟氨酸铈酸盐(12)AS_4S_(13)的结构。 它在太空组I4-BAR3M中结晶。 在该温度范围内没有观察到结构转变。 该结构在ANHARMONIC近似下精制原子位移,并且使用最大熵方法改进了电子密度图。 两种方法表明三角形硫配位和高温下的邻近部位中铜原子的明显静态紊乱,而这些分裂铜位点在较低温度下很好地定义。 一种粒子潜力用于描述这些铜部位的原子的行为。 这种行为可以是磁性变化的结构原因。

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