A Tale of Two Metals: New Cerium Iron Borocarbide Intermetallics Grown from Rare-Earth/Transition Metal Eutectic Fluxes
作者:Patricia C. Tucker、Jason Nyffeler、Banghao Chen、Andrew Ozarowski、Ryan Stillwell、Susan E. Latturner
DOI:10.1021/ja303370j
日期:2012.7.25
R(33)Fe(14-x)Al(x+y)B(25-y)C(34) (R = La or Ce; x ≤ 0.9; y ≤ 0.2) and R(33)Fe(13-x)Al(x)B(18)C(34) (R = Ce or Pr; x < 0.1) were synthesized from reactions of iron with boron, carbon, and aluminum in R-T eutectic fluxes (T = Fe, Co, or Ni). These phases crystallize in the cubic space group Im3m (a = 14.617(1) Å, Z = 2, R(1) = 0.0155 for Ce(33)Fe(13.1)Al(1.1)B(24.8)C(34), and a = 14.246(8) Å, Z = 2,
R(33)Fe(14-x)Al(x+y)B(25-y)C(34)(R = La 或 Ce;x ≤ 0.9;y ≤ 0.2)和 R(33)Fe(13- x)Al(x)B(18)C(34)(R = Ce 或 Pr;x < 0.1)由铁与硼、碳和铝在 RT 共晶熔剂(T = Fe、Co 或你)。这些相在立方空间群 Im3m 中结晶 (a = 14.617(1) Å, Z = 2, R(1) = 0.0155 对于 Ce(33)Fe(13.1)Al(1.1)B(24.8)C(34),对于 Ce(33)Fe(13)B(18)C(34),a = 14.246(8) Å,Z = 2,R(1) = 0.0142。它们的结构可以描述为大型 Fe(13) 或 Fe(14) 簇的体心立方阵列,这些簇被硼碳化物链覆盖并被稀土阳离子包围。由于铈可能存在两种价态以及铁位点上可能存在磁矩,含铈类似物的磁性行为变得复杂。温度相关磁化率测量和穆斯堡尔数据表明