Ternary rare-earth selenides with the U3ScS6 structure type: synthesis, characterization, and some magnetic properties of Ln3TSe6 (Ln = Sm, Gd; T = In, Cr) and Tb3CrSe6.

Ternary rare-earth selenides with the U3ScS6 structure type: synthesis, characterization, and some magnetic properties of Ln3TSe6 (Ln = Sm, Gd; T = In, Cr) and Tb3CrSe6.
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U3ScS6 结构类型的三元稀土硒化物:Ln3TSe6(Ln = Sm、Gd;T = In、Cr)和 Tb3CrSe6 的合成、表征和一些磁性能。

DOI:
10.1021/ic9914802
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发表时间:
2000
影响因子:
4.6
通讯作者:
J. Ibers
J. Ibers
中科院分区:
化学2区
文献类型:
--
作者:
O. Tougait;J. Ibers

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用850 ℃的固相反应合成了新化合物Ln_3 TSe_6(Ln = Sm,Gd; T = In,Cr)和Tb_3CrSe_6。KBr助熔剂用于促进晶体生长。这些同构化合物以U3 ScS 6结构类型结晶。晶体结构由LnSe 7假八面体或LnSe 8双帽三角棱柱和TSe 6八面体构成。磁性测量表明Sm 3 TSe 6(T = In,Cr)和Tb 3CrSe 6在5 K以下是顺磁性的,而Gd 3CrSe 6在10 K时发生反铁磁转变.晶体数据:斜方晶系,Pnnm,Z = 4,T = -120 ℃,(化合物a(A),B(A),c(A))-Sm_3 InSe_6,14.177(3),17.352(4),4.0625(8); Gd_3 InSe_6,14.071(3),17.286(4),4.0202(8); Sm 3CrSe 6,14.032(3),16.782(3),3.9841(8); Gd 3CrSe 6,13.938(3),16.780(3),3.9559(8); Tb 3CrSe 6,13.885(3),16.672(3),3.9215(8).
The new compounds Ln3TSe6 (Ln = Sm, Gd; T = In, Cr) and Tb3CrSe6 have been synthesized by the solid-state reactions of the elements at 850 degrees C. A KBr flux was used to promote crystal growth. These isostructural compounds crystallize with the U3ScS6 structure type. The crystal structure is built from LnSe7 pseudo-octahedra or LnSe8 bicapped trigonal prisms and TSe6 octahedra. Magnetic measurements show that Sm3TSe6 (T = In, Cr) and Tb3CrSe6 are paramagnetic down to 5 K whereas Gd3CrSe6 undergoes an antiferromagnetic transition at 10 K. Crystal data: orthorhombic, Pnnm, Z = 4, T = -120 degrees C, (compound, a (A), b (A), c (A))-Sm3InSe6, 14.177(3), 17.352(4), 4.0625(8); Gd3InSe6, 14.071(3), 17.286(4), 4.0202(8); Sm3CrSe6, 14.032(3), 16.782(3), 3.9841(8); Gd3CrSe6, 13.938(3), 16.780(3), 3.9559(8); Tb3CrSe6, 13.885(3), 16.672(3), 3.9215(8).