Crystallographic and physical properties of RE

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• 作者：I. Veremchuk ; R. Gumeniuk ; Yu. Prots ; W. Schnelle ; U. Burkhardt ; H. Rosner ; Yu. Kuz'ma ; A. Leithe-Jasper
• 关键词：Crystal structure ; Borides ; Magnetic susceptibility ; Electrical conductivity
• 刊名：Solid State Sciences
• 出版年：2009
• 出版时间：February 2009
• 年：2009
• 卷：11
• 期：2
• 页码：507-512
• 全文大小：462 K

文摘

Crystallographic and physical properties of cubic Er_2−xNi₂₁B₆, Yb_2−xNi₂₁B₆ and Lu_2−xNi₂₁B₆ have been studied. Their crystal structures have been established from single-crystal and powder X-ray diffraction data (space group , Cr₂₃C₆ type of structure): Er_2−xNi₂₁B₆, a = 10.6520(2) Å, R_F = 0.041, R_W = 0.044 (for x = 0.18); Yb_2−xNi₂₁B₆, a = 10.6412(2) Å, R_F = 0.021, R_W = 0.022 (for x = 0.14); a = 10.6243(2) Å, R_F = 0.023, R_W = 0.025 (for x = 0.30); Lu_2−xNi₂₁B₆, a = 10.6269(2) Å, R_F = 0.023, R_W = 0.023 (for x = 0.35). Small homogeneity ranges extend from x = 0.1–0.9 for Er_2−xNi₂₁B₆ and from x = 0.1–0.3 for Yb_2−xNi₂₁B₆. No homogeneity range was found for Lu_2−xNi₂₁B₆ (x = 0.35). Magnetization measurements for Yb_2−xNi₂₁B₆ and Er_2−xNi₂₁B₆ reveal the 4f¹³ (Yb³⁺) and 4f¹¹ (Er³⁺) electronic state and no magnetic ordering above 1.8 K. RE_2−xNi₂₁B₆ compounds show metallic behavior in electrical conductivity.