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Magnetic Behavior and Microstructure of Vanadium Phosphate Glasses
Author(s) -
FRIEBELE E. J.,
WILSON L. K.,
KINSER D. L.
Publication year - 1972
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1972.tb11244.x
Subject(s) - vanadium , microstructure , materials science , antiferromagnetism , phosphate glass , spin glass , ion , analytical chemistry (journal) , phase (matter) , hysteresis , néel temperature , glass transition , nuclear magnetic resonance , condensed matter physics , magnetization , metallurgy , chemistry , composite material , magnetic field , doping , chromatography , physics , optoelectronics , organic chemistry , polymer , quantum mechanics
The magnetic properties and microstructures of the vanadium phosphate glass system over the composition range 60 to 90 mol% V 2 O 5 were investigated to study magnetic ordering in the glass and the effect of microstructure on its magnetic properties. Direct antiferromagnetic coupling between V 4+ ions in the glassy matrix exists, and a transition temperature near ‐ 70°C was observed. As‐cast glasses with high V 2 O 5 concentrations separated into two glassy phases; this separation increased the ESR line width as a result of inhomogeneity broadening. The separation, which concentrated the vanadium ions in a vanadium‐rich phase, caused a hysteresis in the plot of ESR line intensity vs temperature at the transition temperature. Reduction of the vanadium ions by dextrose added to the melt enhanced phase separation and resulted in weak antiferromagnetic transitions at +70° and ‐120°C, the Neel temperatures of VO 2 and V 2 O 3 , respectively.