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Pressure‐induced Pb–Pb bonding and phase transition in Pb2SnO4
Acta Crystallographica Section B ( IF 1.3 ) Pub Date : 2020-11-11 , DOI: 10.1107/s205252062001238x
Dominik Spahr 1 , Michał Stękiel 1 , Dominik Zimmer 1 , Lkhamsuren Bayarjargal 1 , Katja Bunk 1 , Wolfgang Morgenroth 1 , Victor Milman 2 , Keith Refson 3 , Dominik Jochym 4 , Peter J P Byrne 5 , Björn Winkler 1
Affiliation  

High‐pressure single‐crystal to 20 GPa and powder diffraction measurements to 50 GPa, show that the structure of Pb2SnO4 strongly distorts on compression with an elongation of one axis. A structural phase transition occurs between 10 GPa and 12 GPa, with a change of space group from Pbam to Pnam. The resistivity decreases by more than six orders of magnitude when pressure is increased from ambient conditions to 50 GPa. This insulator‐to‐semiconductor transition is accompanied by a reversible appearance change from transparent to opaque. Density functional theory‐based calculations show that at ambient conditions the channels in the structure host the stereochemically‐active Pb 6s2 lone electron pairs. On compression the lone electron pairs form bonds between Pb2+ ions. Also provided is an assignment of irreducible representations to the experimentally observed Raman bands.

中文翻译:


Pb2SnO4 中压力诱导的 Pb-Pb 键合和相变



20 GPa 的高压单晶和 50 GPa 的粉末衍射测量表明,Pb 2 SnO 4的结构在压缩时发生强烈扭曲,并出现一个轴的伸长。结构相变发生在 10 GPa 和 12 GPa 之间,空间群从Pbam变为Pnam 。当压力从环境条件增加到 50 GPa 时,电阻率下降超过六个数量级。这种绝缘体到半导体的转变伴随着从透明到不透明的可逆外观变化。基于密度泛函理论的计算表明,在环境条件下,结构中的通道承载着立体化学活性的 Pb 6 s 2孤电子对。在压缩时,孤电子对在 Pb 2+离子之间形成键。还提供了对实验观察到的拉曼带的不可约表示的分配。
更新日期:2020-12-07
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