Hydroxide perovskite solid solutions along the CuxZn1−xSn(OH)6 join have been investigated at ambient conditions. Two compositions, Cu0.4Zn0.6Sn(OH)6 (cubic) and CuSn(OH)6 (tetragonal), have also been studied at pressures up to 17 GPa. In both ambient and high-pressure experiments, samples were characterised using powder X-ray diffraction. Bulk compositions between 0 ≤ XCu ≤ 0.4 are metrically cubic (space group Pn3¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\bar{3}$$\end{document}), whereas those with XCu = 0.9 and 1 produced single-phase tetragonal Cu0.9Zn0.1Sn(OH)6 and CuSn(OH)6 (space group P42/n). The products of syntheses with 0.5 ≤ XCu ≤ 0.8 contain coexisting cubic and tetragonal phases. The cubic → tetragonal transformation is rationalised in terms of being driven by local strain associated with the accumulation of Cu-rich domains in the cubic phase. The high-pressure studies of cubic Cu0.4Zn0.6Sn(OH)6 and tetragonal CuSn(OH)6 phases showed contrasting behaviour. The compression curve of the cubic phase is smooth without inflexion or discontinuity to 17 GPa. The derived bulk modulus of Cu0.4Zn0.6Sn(OH)6 is K0 = 75.8(4) GPa (K′ = 4). For CuSn(OH)6, compression data cannot be fitted by a single equation-of-state over the entire pressure range to 17 GPa, as there is a clear discontinuity between 7 and 10 GPa that corresponds to an increase in compressibility at higher pressures. Compression data for CuSn(OH)6 to 7 GPa are: K0 = 59.7(9) GPa, Ka0 = 79(2) GPa, and Kc0 = 38.0(3) GPa (K′ = 4 for all). It is shown that the strong Jahn–Teller distortion associated with the Cu(OH)6 octahedron is primarily responsible for the discontinuous and highly anisotropic compressional behaviour of the unit cell of CuSn(OH)6 hydroxide perovskite.

中文翻译：

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压力和成分对含铜氢氧化物钙钛矿的影响

已经在环境条件下研究了沿 CuxZn1-xSn(OH)6 连接的氢氧化钙钛矿固溶体。两种成分，Cu0.4Zn0.6Sn(OH)6（立方）和 CuSn(OH)6（四方），也在高达 17 GPa 的压力下进行了研究。在常压和高压实验中，样品均使用粉末 X 射线衍射进行表征。0 ≤ XCu ≤ 0.4 之间的体成分是公制立方（空间群 Pn3¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \ usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\bar{3}$$\end{document})，而那些 XCu = 0.9 和 1相四方晶 Cu0.9Zn0.1Sn(OH)6 和 CuSn(OH)6（空间群 P42/n）。0.5≤XCu≤0的合成产物。8 包含共存的立方相和四方相。立方→四方转化是由与立方相中富铜域的积累相关的局部应变驱动的。立方 Cu0.4Zn0.6Sn(OH)6 和四方 CuSn(OH)6 相的高压研究显示了对比行为。立方相的压缩曲线平滑，无拐点或不连续至 17 GPa。Cu0.4Zn0.6Sn(OH)6 的导出体积模量为 K0 = 75.8(4) GPa (K' = 4)。对于 CuSn(OH)6，压缩数据不能通过单个状态方程在 17 GPa 的整个压力范围内拟合，因为在 7 到 10 GPa 之间存在明显的不连续性，这对应于更高压力下可压缩性的增加. CuSn(OH)6 至 7 GPa 的压缩数据为：K0 = 59.7(9) GPa、Ka0 = 79(2) GPa 和 Kc0 = 38。0(3) GPa（K' = 4）。结果表明，与 Cu(OH)6 八面体相关的强 Jahn-Teller 畸变是导致 CuSn(OH)6 氢氧化钙钛矿晶胞不连续且高度各向异性压缩行为的主要原因。