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On the magnetic properties of Lithium Vanadium Bronzes Li x V 2 O 5
Author(s) -
Doumerc J. P.,
Cocciantelli J. M.,
Grenier J. C.,
Pouchard M.,
Hagenmuller P.
Publication year - 1993
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.19936190418
Subject(s) - antiferromagnetism , vanadium , lithium (medication) , ion , magnetic susceptibility , bronze , phase (matter) , atmospheric temperature range , heisenberg model , condensed matter physics , chemistry , spin (aerodynamics) , materials science , crystallography , inorganic chemistry , physics , thermodynamics , metallurgy , medicine , organic chemistry , endocrinology
Magnetic susceptibility of V 2 O 5 and of the α‐, ϵ‐, δ‐ and γ‐Li x V 2 O 5 bronzes prepared either at high or at room temperature has been measured between liquid helium and ambient temperature. The results are representative of the localized character of the V 4+ ion d‐electron and, for high enough x‐values, of the existence of antiferromagnetic interactions in a low dimensional system. The intrachain exchange integral J has been determined using the Bonner / Fischer model for Heisenberg chains with S = 1/2 spin. It is larger for the γ‐ than for the δ‐phase. This result as well as the occurrence of long range ordering below T N ≈ 130 K in the γ‐phase may be ascribed to ordering of V 4+ and V 5+ ions in the former bronze and to the random distribution of V 4+ ions in the latter one.