期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 63, 期 5, 页码 853-859出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0022-3697(01)00239-6
关键词
magnetic materials; Mossbauer spectroscopy; magnetic properties
Single-phase Eu2Si5N8 was synthesized from metallic europium and silicon diimide in a tungsten crucible using a big h frequency furnace. The Eu2Si5N8 structure consists of a three-dimensional network of corner sharing SiN4 tetrahedra in which the europium ions occupy two crystallographically different sites. Magnetic susceptibility measurements of Eu2Si5N8 show Curie-Weiss behaviour above 50 K with an experimental magnetic moment of 7.67(5)mu(B)/Eu, indicating divalent europium. Ferromagnetic ordering is detected at 13.0(5) K. The saturation magnetic moment is 7.0(1)mu(B)/Eu at 5 T and 4.5 K. The two europium sites could not be distinguished by Eu-151 Mossbauer spectroscopy. The room temperature spectrum could be fitted by only one signal at an isomer shift of delta = -11.82(5) mm/s subject to quadrupole splitting of DeltaE(Q) = 16.8(2) mm/s and an asymmetry parameter of 0.67(7). At 4.2 K full magnetic hyperfine field splitting is observed with a hyperfine field of 24.9(2) T at the europium nuclei. (C) 2002 Elsevier Science Ltd. All rights reserved.
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