Synthesis and structure determination of Ce₆Cd₂₃Te: a new chalcogen-containing member of the RE₆Cd₂₃T family (RE is a rare-earth metal and T is a late group 14, 15 and 16 element)

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• 作者：Griffen Desroches and Svilen Bobev
• 关键词：intermetallic phase ; chalcogen ; rare earth ; Ce6Cd23Te ; Ce&ndash ; Cd&ndash ; Te ternary phase ; powder diffraction ; crystal structure ; direct current magnetization ; Curie&ndash ; Weiss law ; magnetic susceptibility
• 刊名：Acta Crystallographica Section C
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：73
• 期：2
• 页码：121-125
• 全文大小：499K
• ISSN：1600-5759

文摘

The ternary phase hexacerium tricosacadmium telluride, Ce₆Cd₂₃Te, was synthesized by a high-temperature reaction of the elements in sealed Nb ampoules and was structurally characterized by powder and single-crystal X-ray diffraction. The structure, established from single-crystal X-ray diffraction methods, is isopointal with the Zr₆Zn₂₃Si structure type (Pearson symbol cF120, cubic space group Fmm), a filled version of the Th₆Mn₂₃ structure with the same space group and Pearson symbol cF116. Though no Cd-containing rare-earth metal binaries are known to form with this structure, it appears that the addition of small amounts of a p-block element allows the formation of such interstitially stabilized ternary compounds. Temperature-dependent direct current (dc) magnetization measurements suggest local-moment magnetism arising from the Ce³⁺ ground state, with possible valence fluctuations at low temperature, inferred from the deviations from the Curie–Weiss law.