Cation distribution and entropic disordering in mixed spinel ferrite Ga0.4Fe0.6NiCr1−yAlyO4

Srivastava, J. K. ; Jéhanno, G. ; Muraleedharan, K. ; Vijayaraghavan, R. (1987) Cation distribution and entropic disordering in mixed spinel ferrite Ga0.4Fe0.6NiCr1−yAlyO4 Hyperfine Interactions, 34 (1-4). pp. 471-474. ISSN 0304-3843

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Official URL: http://www.springerlink.com/content/m8012v17426njv...

Related URL: http://dx.doi.org/10.1007/BF02072759

Abstract

Mössbauer measurements (4.2≤T≤298°K) indicate the presence of entropic disordering in (Ga0.43+Fe0.63+Alp3+) [Ni2+Cr1−y3+Aly−p3+Fep3+]O4 and a linear increase in p with y between 0(y=0) and 0.11(y=1). Entropic spins are located only on A-sites indicating relatively large A-sublattice frustration. Weak A-B coupling could explain this separate sublattice behaviour. Magneton number, alongwith Mössbauer p values, shows B-site canting which increases with y revealing weakness of A-B interaction. Present system can be called a "frustrated ferrimagnet" or "entropie ferrimagnet" where ferrimagnetic and frustrated (entropie) spins are coexisting.

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