Ternary rare-earth iron arsenides RE12Fe57.5As41 (RE = La, Ce)

Inorganic Chemistry
Stanislav S StoykoArthur Mar

Abstract

The rare-earth iron arsenides RE(12)Fe(57.5)As(41) (RE = La, Ce) have been prepared by direct reactions of the elements in the presence of a Sn flux. Analysis of single-crystal X-ray diffraction data reveals that they adopt a new orthorhombic structure type (Pearson symbol oP236, space group Pmmn, Z = 2; a = 10.8881(9) A, b = 25.753(2) A, c = 12.5436(10) A for RE = La; a = 10.8376(8) A, b = 25.639(2) A, c = 12.4701(9) A for RE = Ce). In this metal-rich arsenide, the complex three-dimensional network (derived from 4 RE, 24 Fe, and 17 As sites) can be described as being built from unusual wavelike layers of connected As-centered trigonal prisms. Five of the Fe sites are partially occupied. The electronic structure of these compounds was probed through core-line X-ray photoelectron spectra. Magnetic susceptibility measurements indicated ferromagnetic ordering at T(C) = 125 and 95 K for the La and Ce compounds, respectively. Electrical resistivity measurements on single crystals of Ce(12)Fe(57.5)As(41) showed metallic behavior with a prominent transition that coincides closely with the ferromagnetic ordering temperature.

References

Feb 26, 2008·Journal of the American Chemical Society·Yoichi KamiharaHideo Hosono
May 21, 2008·Angewandte Chemie·Dirk Johrendt, Rainer Pöttgen
Sep 10, 2008·Angewandte Chemie·Marianne RotterDirk Johrendt
Oct 15, 2008·Physical Review Letters·Marianne RotterDirk Johrendt

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Citations

Sep 29, 2011·Inorganic Chemistry·Stanislav S Stoyko, Arthur Mar
Jan 30, 2013·Inorganic Chemistry·Kai FengYicheng Wu
Jan 15, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Alexander OvchinnikovAnja-Verena Mudring
Sep 25, 2019·Materials·Chenghui FuJinzhu Zhang

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