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Cu 2(1−z) Mn z Ga 2 Se 4 alloys: Phase diagram and effects of Mn ordering on magnetic behaviour
Author(s) -
Quintero M.,
Lopez M.,
Morocoima M.,
Rivero A.,
Bocaranda P.,
Woolley J. C.,
Lamarche G.,
Re R. Brundel
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221930206
Subject(s) - phase diagram , condensed matter physics , lattice constant , alloy , materials science , crystallite , curie temperature , diffraction , magnetic susceptibility , lattice (music) , solid solution , atmospheric temperature range , diagram , phase (matter) , thermodynamics , chemistry , ferromagnetism , physics , metallurgy , mathematics , optics , organic chemistry , acoustics , statistics
X‐ray powder diffraction, differential thermal analysis, and magnetic susceptibility measurements on polycrystalline samples are used to determine the details of the T(z) phase diagram of the alloy system Cu 2(1− z ) Mn z Ga 2 Se 4 . At high temperatures, there is a single phase solid solution across the complete diagram in a disordered zincblende phase. However, at lower temperatures, the singlephase range is limited to relatively wide terminal fields, which are ordered structures based on a zincblende subcell. Several different ordered phases are found to occur and the values of the Curie‐Weiss constant θ are used to investigate the changes in ordering with composition. It is shown that these ordering changes cause discontinuous changes in the slope of the graphs against composition of the lattice parameters, optical energy gap, and Néel temperature values.