首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >High-pressure high-temperature decomposition of CeCoGa to the Laves phases CeCo0.58Ga1.42,CeCo0.72Ga1.28, and CeCo2
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High-pressure high-temperature decomposition of CeCoGa to the Laves phases CeCo0.58Ga1.42,CeCo0.72Ga1.28, and CeCo2

机译:CeCoGa的高压高温分解为Laves相CeCo0.58Ga1.42,CeCo0.72Ga1.28和CeCo2

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摘要

The monoclinic intermediate-valent gallide CeCoGa decomposes under high-pressure (HP) (9.5 GPa) high-temperature (HT) (1470 K) conditions into the Laves phases CeCo0.58 Ga-1.42 (MgCu2 type), CeCo0.72 Ga-1.28 (MgZn2 type; major product phase), and CeCo2 (MgCu2 type). The structures of the ternary Laves phases were refined from single crystal X-ray diffractometer data: Fd (3) over barm, a = 778.3(1) pm, wR2 = 0.0310, 63 F-2 values, five variables for CeCo (0.58(3)) Ga (1.42(3)) and P6(3)/mmc, a = 547.24(5), c = 858.76(7) pm, wR2 = 0.1009, 195 F-2 values, 13 variables for CeCo (0.72(1)) Ga (1.28(1)). Partial substitution of cobalt by gallium leads to a significant increase of the distances within the tetrahedral network: 253 pm Co-Co in CeCo2 as compared to 275 pm in CeCo0.58(3) Ga (1.42(3)) and 265-277 pm in CeCo (0.72(1)) Ga-1.28(1). The crystal chemical consequences are briefly discussed.
机译:单斜晶系中等价镓化物CeCoGa在高压(HP)(9.5 GPa)高温(HT)(1470 K)条件下分解成Laves相CeCo0.58 Ga-1.42(MgCu2型),CeCo0.72 Ga- 1.28(MgZn2型;主要产品相)和CeCo2(MgCu2型)。从单晶X射线衍射仪数据中精制了三元Laves相的结构:bard上的Fd(3),a = 778.3(1)pm,wR2 = 0.0310,63 F-2值,CeCo的五个变量(0.58( 3))Ga(1.42(3))和P6(3)/ mmc,a = 547.24(5),c = 858.76(7)pm,wR2 = 0.1009,195 F-2值,CeCo的13个变量(0.72( 1))Ga(1.28(1))。用镓部分取代钴会导致四面体网络内距离的显着增加:CeCo2中Co-Co的253 pm,而CeCo0.58(3)Ga(1.42(3))和265-277 pm的275 pm在CeCo(0.72(1))Ga-1.28(1)中。简要讨论了晶体化学后果。

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