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Description of Anhydrous (Black) Dioptase as a S = 1/2 Uniform Antiferromagnetic Chain System
Author(s) -
Law Joseph M.,
Hoch Constantin,
Whangbo MyungHwan,
Kremer Reinhard K.
Publication year - 2010
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.200900403
Subject(s) - antiferromagnetism , dimer , magnetic susceptibility , condensed matter physics , anhydrous , specific heat , spin (aerodynamics) , chemistry , anomaly (physics) , crystal structure , crystallography , materials science , physics , thermodynamics , organic chemistry
Abstract The structural and magnetic properties of anhydrous (black) dioptase, CuSiO 3 , were investigated by carrying out single‐crystal X‐ray diffraction, specific heat, and magnetic susceptibility measurements as well as by performing spin dimer analysis based on extended Hückel tight‐binding calculations. Our spin dimer analysis indicates that black dioptase is a S = 1/2 uniform antiferromagnetic chain system with the interchain spin exchange weaker than the intrachain exchange by three orders of magnitude. Specific heat and magnetic susceptibility measurements show that the intrachain exchange is –174(2) K, and the interchain exchange is of the order of ~2 K. They lead to long‐range magnetic ordering at about 5 K as evidenced by a broad anomaly in the specific heat.