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Structure and magnetic properties of RE 4 Ni 2 Mg 3 with RE =Y, Tb−Tm and Lu – New representatives of the Ru 4 B 2 Al 3 type
Abstract The intermetallic compounds RE 4 Ni 2 Mg 3 with RE =Y, Tb−Tm and Lu were synthesized from the elements in sealed tantalum ampules in a high‐frequency furnace and characterized by powder X‐ray diffraction. The RE 4 Ni 2 Mg 3 phases crystallize with a site occupancy variant of the tetragonal...
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| Published in: | Zeitschrift für anorganische und allgemeine Chemie (1950) 2022-09, Vol.648 (17) |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites |
| Online Access: | Get full text |
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| Summary: | Abstract
The intermetallic compounds
RE
4
Ni
2
Mg
3
with
RE
=Y, Tb−Tm and Lu were synthesized from the elements in sealed tantalum ampules in a high‐frequency furnace and characterized by powder X‐ray diffraction. The
RE
4
Ni
2
Mg
3
phases crystallize with a site occupancy variant of the tetragonal Ru
4
B
2
Al
3
type structure, space group
P
4/
mmm
. The structures of Tm
4.21(1)
Ni
2
Mg
2.79(1)
, Lu
4.28(1)
Ni
2
Mg
2.72(1)
and Lu
4.41(1)
Ni
2
Mg
2.59(1)
were refined from single crystal X‐ray diffractometer data. Refinements of the occupancy parameters indicated different degrees of
RE
/Mg mixing on several Wyckoff positions. The
RE
4
Ni
2
Mg
3
structures are simple intergrowth variants of CsCl and AlB
2
related slabs with distorted Ni@
RE
6
trigonal prisms and Mg@
RE
8
distorted cubes. Temperature dependent magnetic susceptibility studies reveal Pauli paramagnetism for Y
4
Ni
2
Mg
3
and Lu
4
Ni
2
Mg
3
. The compounds with
RE
=Dy, Ho, Er and Tm are Curie‐Weiss paramagnets that order antiferromagnetically between 17.1(1) (
RE
=Dy) and 6.0(1) K (
RE
=Tm). The antiferromagnetic ground states are substantiated by metamagnetic transitions. |
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| ISSN: | 0044-2313 1521-3749 |
| DOI: | 10.1002/zaac.202100390 |