Syntheses, Structures and Properties of the Cluster Compounds Nb6I11-xBrx and Y2-xMxC2Br2-yIy(M=Sr, La, Lu, Th).

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  • 金属クラスター化合物Nb6I11-xBrxおよびY2-xMxC2Br2-yIy(M=Sr,La,Lu,Th)の結晶構造と物性
  • キンゾク クラスターカゴウブツ Nb6I11-xBrx オヨビ Y2-xMxC

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Abstract

Crystal structure, chemical bonding and physical property are discussed for the metal-rich cluster compound Nb6I11-xBrx containing discrete clusters and the layered cluster compound Y2-xMxC2Br2-yIy, focusing on the effect of replacement by other atoms having different mass, size and bonding. Nb6I11-xBrx undergoes a spin cross-over phase transition and with increasing Br content the transition temperature shifts from 274 to 170 K. The highest superconducting transition temperature in the yttrium ethenide halides occurs at a intermediate composition rather than at each end-member.

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