Equiatomic intermetallic compounds REtMg (RE = Y, Eu, Tb-Tm, Lu) - Structure and magnetism

被引：16

作者：

Stein, Sebastian ^{[1
]}

Heletta, Lukas ^{[1
]}

Block, Theresa ^{[1
]}

Gerke, Birgit ^{[1
]}

Poettgen, Rainer ^{[1
]}

机构：

[1] Univ Munster, Inst Anorgan & Analyt Chem, Corrensstr 30, D-48149 Munster, Germany

来源：

SOLID STATE SCIENCES | 2017年 / 67卷

关键词：

Intermetallic phases; Crystal structure; Dimorphism; Magnesium; Magnetic properties; Eu-151 Mossbauer spectroscopy; EU-151; MOSSBAUER-SPECTROSCOPY; METAL-MAGNESIUM COMPOUNDS; CRYSTAL-STRUCTURES; ABSOLUTE-CONFIGURATION; COMPUTER-PROGRAM; PD; HYDROGENATION; ND; LA; CE;

D O I：

10.1016/j.solidstatesciences.2017.03.006

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Eight new equiatomic REPtMg intermetallics with RE = Y, Eu, Tb-Tm, Lu were synthesized from the elements in sealed niobium ampoules (induction melting followed by different annealing sequences). All samples were characterized through X-ray powder patterns and the structures of YPtMg, EuPtMg, DyPtMg, HoPtMg and TmPtMg were refined from single crystal X-ray diffractometer data. The REPtMg phases crystallize with two different structure types. The representatives with RE = Y, Tb-Ho crystallize with the hexagonal ZrNiAl type, space group P (6) over barm, while those with RE = Eu, Yb and Lu adopt the orthorhombic TiNiSi type, space group Pnma. ErPtMg and TmPtMg are dimorphic with a ZrNiAl type high and a TiNiSi type low-temperature modification. Temperature-dependent magnetic susceptibility measurements indicate Pauli paramagnetism for YPtMg and LuPtMg while EuPtMg, TbPtMg, DyPtMg and HoPtMg are Curie-Weiss paramagnets. Antiferromagnetic (TN = 12.6 K for EuPtMg) respectively ferro-magnetic ordering (Tc = 56.3 K for TbPtMg, 28.8 K for DyPtMg and 19.9 K for HoPtMg) occurs in the low temperature regime.Eu-151 Mossbauer spectra confirm divalent europium (delta = -8.03 mm s(-1) at 78 K) in EuPtMg and show strong magnetic hyperfine field splitting below the Neel temperature. (C) 2017 Elsevier Masson SAS. All rights reserved.

引用

页码：64 / 71

页数：8

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