Structure and ferromagnetism of the rare-earth zintl compounds:: Yb14MnSb11 and Yb14MnBi11
Structure and ferromagnetism of the rare-earth zintl compounds:: Yb14MnSb11 and Yb14MnBi11
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DOI：
10.1021/cm980358i
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发表时间：
1998-11-01
影响因子：
8.6
通讯作者：
Webb, DJ
中科院分区：
文献类型：
--
作者：
Chan, JY;Olmstead, MM;Webb, DJ
稀土过渡金属化合物Yb 14 MnSb 11和Yb 14 MnBi 11是通过在1000-1200 ℃加热化学计量量的元素制备的。这些化合物与Zintl化合物Ca_（14）AlSb_（11）是同构的，并且在四元空间群I_4（1）/acd（Z = 8）中结晶。对Yb 14 MnSb 11的单晶X射线数据（143 K）进行了修正[a = 16.615（2）Angstrom，c = 21.948（4）Angstrom，V = 6059（2）Angstrom（3），R1/wR 2（0.0299/0.0479）]和Yb 14 MnBi 11 [α = 17.000（3）埃，22.259（6）埃，V = 6433（2）埃（3），R1/wR 2（0.0631/0.133）]。结构分析与Yb 2+一致。随温度变化的磁化率数据表明，Yb 14 MnSb 11在56 K时为铁磁有序，而Yb 14 MnBi 11在58 K时发生铁磁转变，在28 K时又发生铁磁转变.高温磁化率数据可用修正的Curie-Weiss定律拟合，Sb和Bi化合物的μ（eff）= 4.92（2）μ（B）和μ（eff）= 4.9（1）μ（B）。这一结果与Mn ~（3+）（d（4））和Yb ~（2+）（f（14））的归属一致。单晶的磁性数据提供了额外的证据的磁性转变，并表明该化合物是磁各向异性。
Rare-earth transition metal compounds Yb14MnSb11 and Yb14MnBi11 have been prepared by heating stoichiometric amounts of the elements at 1000-1200 degrees C. These compounds are isostructural with the Zintl compound Ca14AlSb11 and crystallize in the tetragonal space group I4(1)/acd (Z = 8). Single-crystal X-ray data (143 K) were refined for Yb14MnSb11 [a = 16.615(2) Angstrom, c = 21.948(4) Angstrom, V = 6059(2) Angstrom(3), and R1/wR2 (0.0299/0.0479)] and Yb14MnBi11 [a = 17.000(3) Angstrom, 22.259(6) Angstrom, V = 6433(2) Angstrom(3), R1/wR2 (0.0631/0.133)]. Structural analysis is consistent with Yb2+. Temperature-dependent magnetic susceptibility data show that Yb14MnSb11 orders ferromagnetically at 56 K and Yb14MnBi11 has a ferromagnetic transition at 58 K and another transition at 28 K. High-temperature magnetic susceptibility data can be fit with a modified Curie-Weiss law and give mu(eff) = 4.92(2)mu(B) and mu(eff) = 4.9(1)mu(B) for the Sb and Bi compounds, respectively. This result is consistent with the assignment of Mn3+ (d(4)) and Yb2+ (f(14)). Single-crystal magnetic data provide additional evidence for the magnetic transitions and show that the compounds are magnetically anisotropic.