Pressure dependence investigation of the low-temperature structure of TlAu(CN)(2) by high-resolution neutron powder diffraction and optical studies
Pressure dependence investigation of the low-temperature structure of TlAu(CN)(2) by high-resolution neutron powder diffraction and optical studies
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DOI：
10.1021/ic961405g
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发表时间：
1997-06-18
影响因子：
4.6
通讯作者：
Hewat, A
中科院分区：
文献类型：
--
作者：
Fischer, P;Mesot, J;Hewat, A
与晶胞参数 b 的异常增加以及 [Au(3)(CN)(2)](-) 离子随温度降低的相关重新取向相反，晶胞。研究发现，当外部静水压力高达 4.5 kbar 时，TlAu(CN)(2) 的体积和晶格参数会线性减小（在 T = 62 K 时）。 [Au(CN)(2)](-) 离子基本上不随压力改变方向。结构结果表明，发光能量随压力的变化是由于 Tl...Au 以及 Au...Au 原子间分离的变化，这再次说明了 Tl...Au 共价相互作用在该化合物中的重要性。
In contrast to the anomalous increase of the lattice parameter b and associated reorientation of the [Au(3)(CN)(2)](-) ion with decreasing temperature, the unit cell. volume and the lattice parameters of TlAu(CN)(2) are found to decrease (at T = 62 K) linearly for external hydrostatic pressures up to 4.5 kbar. The [Au(CN)(2)](-) ions do not essentially change orientation with pressure. The structural results suggest that the change in luminescence energy with pressure is due to changes in Tl ... Au as well as in Au ... Au interatomic separations, which again illustrates the importance of Tl ... Au covalent interactions in this compound,.