Delafossite oxides containing vanadium(III): Preparation and magnetic properties
Language
en
Article de revue
This item was published in
Solid State Sciences. 2005, vol. 7, n° 6, p. 710-717
Elsevier
English Abstract
Although the pure delafossite CuVO2 does not exist, the present study well confirms that large amounts of vanadium(III) can be incorporated into copper based delafossites without reducing Cu+ into metallic copper, as several ...Read more >
Although the pure delafossite CuVO2 does not exist, the present study well confirms that large amounts of vanadium(III) can be incorporated into copper based delafossites without reducing Cu+ into metallic copper, as several solid solutions CuM1−xVxO2 exist where M=Ga, Cr (xless-than-or-equals, slant0.50) or Fe (xless-than-or-equals, slant0.67). Vanadium(III) has a peculiar magnetic behavior. Actually Vsingle bondV antiferromagnetic interactions appear rather large at high temperature, but as the temperature decreases magnetic data can be (at least qualitatively) interpreted assuming the formation of Vsingle bondV pairs. The bonding involves one of the two electrons of the 3d2 (Click to view the MathML source) configuration of V(III)-atoms having a 6-fold D3d coordination, the one occupying the e orbital that lies in the (M, V) layers of the delafossite structure. The behavior changes from a rather 2D ferrimagnetic-like one to a 3D antiferromagnetic one with a Néel temperature larger than 4.5 K in the case of CuFe1−xVxO2 as determined from a Mössbauer study.Read less <
Keywords
Delafossite oxides
Magnetic properties
Mössbauer resonance
Copper vanadium(III) oxide
Origin
Hal imported