Investigation of CuxGayCrzSe4 single crystals

Autor(en): Winiarski, A
OkonskaKozlowska, I
Heimann, J
Neumann, M
Stichwörter: Chemistry; Chemistry, Physical; COPPER; covalency; CUCR2SE4; magnetic susceptibility; Materials Science; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; SPINELS; XPS
Erscheinungsdatum: 1996
Herausgeber: ELSEVIER SCIENCE SA
Journal: JOURNAL OF ALLOYS AND COMPOUNDS
Volumen: 232
Ausgabe: 1-2
Startseite: 63
Seitenende: 66
Zusammenfassung: 
From X-ray photoelectron spectroscopy data and X-ray microprobe analysis the formula CuxGayCrzSe4 (x y z approximate to 3) for the investigated single crystals was determined. Replacement of Cu by Ga in tetrahedral sites of the spinel-type structure was observed. A negative chemical shift of the Cu 2p levels as well as an absence of Cu shake-up satellite lines was noticed. T-c dependency on the Ga content was found from susceptibility measurements. Effective and saturation magnetic moments at low concentrations of gallium (y < 0.16) were found to be higher than in CuCr2Se4. For gallium-rich samples the values of the moments decrease rapidly. The problem of metal valency in this system is discussed in relation to charge distribution. Covalency and stability of the spinel-type structure is also discussed.
ISSN: 09258388
DOI: 10.1016/0925-8388(95)01961-8

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