In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 72, No. 6 ( 2017-5-24), p. 447-455
Abstract:
Eight new intermetallic rare earth-ruthenium-magnesium compounds have been synthesized from the elements in sealed niobium ampoules using different annealing sequences in muffle furnaces. The compounds have been characterized by powder and single crystal X-ray diffraction. Sm 9.2 Ru 6 Mg 17.8 ( a =939.6(2), c =1779(1) pm), Gd 11 Ru 6 Mg 16 ( a =951.9(2), c =1756.8(8) pm), and Tb 10.5 Ru 6 Mg 16.5 ( a =942.5(1), c =1758.3(4) pm) crystallize with the tetragonal Nd 9.34 Ru 6 Mg 17.66 type structure, space group I 4/ mmm . This structure exhibits a complex condensation pattern of square-prisms and square-antiprisms around the magnesium and ruthenium atoms, respectively. Y 2 RuMg 2 ( a =344.0(1), c =2019(1) pm) and Tb 2 RuMg 2 ( a =341.43(6), c =2054.2(7) pm) adopt the Er 2 RuMg 2 structure and Tm 3 Ru 2 Mg ( a =337.72(9), c =1129.8(4) pm) is isotypic with Sc 3 Ru 2 Mg. Tm 3 Ru 2 Mg 2 ( a =337.35(9), c =2671(1) pm) and Lu 3 Ru 2 Mg 2 ( a =335.83(5), c =2652.2(5) pm) are the first ternary ordered variants of the Ti 3 Cu 4 type, space group I 4/ mmm . These five compounds belong to a large family of intermetallics which are completely ordered superstructures of the bcc subcell. The group-subgroup scheme for Lu 3 Ru 2 Mg 2 is presented. The common structural motif of all three structure types are ruthenium-centered rare earth cubes reminicent of the CsCl type. Magnetic susceptibility measurements of Y 2 RuMg 2 and Lu 3 Ru 2 Mg 2 samples revealed Pauli paramagnetism of the conduction electrons.
Type of Medium:
Online Resource
ISSN:
1865-7117
,
0932-0776
DOI:
10.1515/znb-2017-0048
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2017
detail.hit.zdb_id:
2078109-X
detail.hit.zdb_id:
124635-5
