首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Scandium as an Element Intermediate between Rare Earth and Transition Metals in Intermetallics: Crystal Structures of Sc_2Fe_(12)P_7, Sc_(3.6)Fe_(10.4)P_7, and Sc_2Co_4P_3. Other New Compounds with Zr_2Fe_(12)P_7, Hf_2Co_4P_3, Sc_5Co_(19)P_(12), and Yb_6Co_30P_(19) Type Structures
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Scandium as an Element Intermediate between Rare Earth and Transition Metals in Intermetallics: Crystal Structures of Sc_2Fe_(12)P_7, Sc_(3.6)Fe_(10.4)P_7, and Sc_2Co_4P_3. Other New Compounds with Zr_2Fe_(12)P_7, Hf_2Co_4P_3, Sc_5Co_(19)P_(12), and Yb_6Co_30P_(19) Type Structures

机译:Inter作为金属间化合物中稀土元素和过渡金属之间的元素:Sc_2Fe_(12)P_7,Sc_(3.6)Fe_(10.4)P_7和Sc_2Co_4P_3的晶体结构。具有Zr_2Fe_(12)P_7,Hf_2Co_4P_3,Sc_5Co_(19)P_(12)和Yb_6Co_30P_(19)类型结构的其他新化合物

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Twenty five ternary phosphides crystallizing with four different but closely related structure types were prepared using elemental tin as a flux. Their lattice constants are reported. New compounds include Sc_2Fe_(12)P_7, Sc_(3.6)Fe_(10.4)P_7, Y_2Co_(12)P_7, and Hf_2T_(12)P_7 with T = Fe, Co, Ni. They crystallize with the hexagonal Zr_2Fe_(12)P_7 type structure, which was refined from single-crystal X-ray data of Sc_(3.6)Fe_(10.4)P_7: a =944.1(1) pm, c = 363.4(1) pm, R = 0.041 for 719 unique structure factors and 23 variable parameters. The excess scandium atoms occupy one of the four iron sites of the Zr_2Fe_(12)P_7 type structure which has a higher coordination number than the other three iron sites. The two isotypic phosphides Sc_2Fe_(12)P_7 and Sc_(3.6)Fe_(10.4)P_7 do not form a continuous series of solid solutions. The new compounds Sc_2Co_4P_3 and Sc_2Ni_4P_3 are isotypic with Hf_2Co_4P_3. This hexagonal structure was refined for Sc_2Co_4P_3 from single crystal data: a = 1211.5(2) pm, c =363.7(1) pm, R = 0.025 for 500 Fo and 38 variables. Other new compounds reported are Sc_5Ni_(19)P_(12), Zr_5 Fe_(19)P_(12), Hf_5 Fe_(19)P_(12), and Hf_5Co_(19)P_(12) which crystallize with Sc_5Co_(19)P_(12) type structure, and the Yb_6Co_30P_(19) type phosphides Sc_6Co_(30)P_(19), Zr_6Co_(30)P_(19), and Hf_6Co_(30)P_(19). The structural relationships of these ternary phosphides are discussed with special attention to the environments of the transition metal atoms.
机译:使用元素锡作为助熔剂,制备了具有四种不同但密切相关的结构类型的二十五个三价磷化物结晶。报告了它们的晶格常数。新的化合物包括Sc = Fe,Co,Ni的Sc_2Fe_(12)P_7,Sc_(3.6)Fe_(10.4)P_7,Y_2Co_(12)P_7和Hf_2T_(12)P_7。它们以六方晶Zr_2Fe_(12)P_7型晶体结晶,该结构从Sc_(3.6)Fe_(10.4)P_7的单晶X射线数据精制而成:a = 944.1(1)pm,c = 363.4(1)pm对于719个唯一的结构因子和23个可变参数,R = 0.041。过量的atoms原子占据Zr_2Fe_(12)P_7型结构的四个铁位点之一,其配位数比其他三个铁位点更高。两种同型磷化物Sc_2Fe_(12)P_7和Sc_(3.6)Fe_(10.4)P_7没有形成连续的固溶体系列。新化合物Sc_2Co_4P_3和Sc_2Ni_4P_3与Hf_2Co_4P_3同型。对于单晶数据,Sc_2Co_4P_3的六角形结构得到了改进:对于500个Fo和38个变量,a = 1211.5(2)pm,c = 363.7(1)pm,R = 0.025。报告的其他新化合物是Sc_5Ni_(19)P_(12),Zr_5 Fe_(19)P_(12),Hf_5 Fe_(19)P_(12)和Hf_5Co_(19)P_(12),它们会与Sc_5Co_(19)一起结晶。 P_(12)型结构和Yb_6Co_30P_(19)型磷化物Sc_6Co_(30)P_(19),Zr_6Co_(30)P_(19)和Hf_6Co_(30)P_(19)。讨论这些三价磷化物的结构关系时,应特别注意过渡金属原子的环境。

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