Four novel intermetallic silicides, RE5Mn4Al 23-xSix (x = 7.9(9), RE = Ho, Er, Yb) and Er 44Mn55(AlSi)237, have been prepared by reaction in aluminum flux. Three RE5Mn4Al23-xSi x compounds crystallize in the tetragonal space group P4/mmm with the relatively rare Gd5Mg5Fe4Al 18-xSix structure type. Refinement of single-crystal X-ray diffraction data yielded unit cell parameters of a = 11.3834(9)-11.4171(10) Å and c = 4.0297(2)-4.0575(4) Å with volumes ranging from 522.41(5) to 528.90(8) Å3. Structure refinements on single-crystal diffraction data show that Er44Mn55(AlSi)237 adopts a new cubic structure type in the space group Pm3Ì...n with a very large unit cell edge of a = 21.815(3) Å. This new structure is best understood when viewed as two sets of nested polyhedra centered on a main group atom and a manganese atom. These polyhedral clusters describe the majority of the atomic positions in the structure and form a perovskite-type network. We also report the electrical and magnetic properties of the title compounds. All compounds except the Ho analogue behave as normal paramagnetic metals without any observed magnetic transitions above 5 K and exhibit antiferromagnetic correlations deduced from the value of their Curie constants. Ho 5Mn4Al23-xSix exhibits a ferromagnetic transition at 20 K and an additional metamagnetic transition at 10 K, suggesting independent ordering temperatures for two distinct magnetic sublattices.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry