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Effect of Y doping on high-pressure behavior of Ag2S nanocrystals

机译：Y掺杂对Ag 2 S纳米晶体高压行为的影响

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摘要

The effect of the dopant Y on high-pressure-induced polymorph transformation was investigated in Ag2S nanocrystals. A polymorph transformation from monoclinic P21/n phase I (where Ag1 and Ag2 atoms both participated in four-fold-coordinated tetrahedra) to orthorhombic P212121 phase II (where Ag2 participated in four-fold-coordinated distorted tetrahedra but Ag1 in five-fold-coordinated pyramids) and then to another monoclinic P21/n phase III (where Ag1 was still in the five-coordination pyramid-like structure but Ag2 showed a coordination number of five to form trigonal bipyramids) was observed under increasing high pressure at room temperature. The initial monoclinic phase was fully recovered after decompression. Compared with the two transition pressure values of the pure Ag2S sample, those of the Y-doped sample were found to be lower, revealing the significant influence of even a low Y dopant concentration on the compressibility of Ag2S. The smaller bulk modulus and larger volume collapse of the Ag2S:Y sample further suggested it to be more compressible.
机译：在Ag 2 S纳米晶体中研究了掺杂剂Y对高压诱导的多晶型转变的影响。从单斜晶 P 2 1 / n I期的多晶型转变（其中Ag1和Ag2原子都参与了四个折叠配位的四面体）到正交的 P 2 1 2 1 2 < small> 1 阶段II（其中Ag2参与了四倍配位的扭曲四面体，而Ag1参与了五倍配位的金字塔），然后进入了另一个单斜的 P 2 1 / n 阶段III（其中Ag1仍处于五配位金字塔状结构，但Ag2的配位数为5在室温下在升高的高压下观察到生成三方双锥体。减压后，完全恢复了最初的单斜相阶段。与纯Ag 2 S样品的两个转变压力值相比，发现掺Y样品的两个转变压力值更低，这表明即使是较低的样品，其影响也很大。 Y掺杂浓度对Ag 2 S可压缩性的影响。 Ag 2 S：Y样品的较小的体积模量和较大的体积塌陷进一步表明它具有更高的可压缩性。

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