Abstract
The Al-substituted disordered spinel series CuFe 2- x Al x O 4 ( x = 0.0−1.6) has been synthesized and studied by X-ray diffraction, magnetization, ac susceptibility and Mössbauer effect measurements. The lattice constants are determined and the applicability of Vegard's law has been tested. The variation of the saturation magnetic moment per formula unit measured at 77 and 300 K with the Al content is satisfactorily explained on the basis of Néel's collinear spin ordering model for x = 0.0−1.0. The Mössbauer spectra at 300 K have been fitted with two sextets in the ferrimagnetic state corresponding to Fe 3+ at the tetrahedral (A) and octahedral (B) sites for x ≤ 0.8. Mössbauer results confirm a collinear ferrimagnetic structure for x = 0.0−0.6 and suggest non-collinear behaviour for x ≥ 0.8. The Curie temperature decreases nearly linear with increase of Al concentration from x = 0.0 to 1.2.
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