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CeAgAs 2 — a New Derivative of the HfCuSi 2 Type of Structure: Synthesis, Crystal Structure and Magnetic Properties
Author(s) -
Demchyna R.,
Jemetio J. P. F.,
Prots Yu.,
Doert Th.,
Akselrud L. G.,
Schnelle W.,
Kuz'ma Yu.,
Grin Yu.
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200300399
Subject(s) - antiferromagnetism , crystal structure , crystallography , type (biology) , paramagnetism , diffraction , derivative (finance) , group (periodic table) , structure type , magnetic structure , materials science , space (punctuation) , chemistry , space group , x ray crystallography , condensed matter physics , physics , magnetic field , magnetization , optics , ecology , linguistics , philosophy , organic chemistry , financial economics , economics , biology , quantum mechanics
Single crystals of CeAgAs 2 have been obtained by chemical transport reactions starting from a pre‐reacted powder sample. The crystal structure was solved using X‐ray diffraction (space group Pmca , No. 57, a = 5.7586(4) Å, b = 5.7852(4) Å, c = 21.066(3) Å, Z = 8) and refined to a residual of R(F) = 0.029 for 46 refined parameters and 1020 reflections. The structure of CeAgAs 2 represents a new distorted and ordered variant of the HfCuSi 2 type. The characteristic feature of this structure are infinite cis‐trans chains of As atoms with As—As distances of 2.563(1) Å and 2.601(1) Å. CeAgAs 2 is paramagnetic ( μ eff = 2.37 μ B , θ = —10.5(2) K), with antiferromagnetic ordering at 5.5(2) K and exhibits a metamagnetic transition starting at 4.6 kOe and T = 1.8 K.