Magnetic properties of Li(MnyFe1−y)PO4 and its delithiated phases

A series of synthetic (MnyFe1−y)PO4 (y<0.8) phases with negligible disorder and impurities were obtained by chemical oxidation of crystallized isotypic Li(MnyFe1−y)PO4 under optimized conditions. This enabled us to perform the comparative magnetic study along the two solid-solution lines based on inherent susceptibility data with no parasitic magnetic signals. All samples exhibit antiferromagnetism but the decrease in Neel temperature is more than seven times larger in (MnyFe1−y)PO4 than in Li(MnyFe1−y)PO4. This was discussed in terms of the asymmetric superexchange interaction by an unusual synergetic effect of Jahn-Teller distortion and edge-shared interconnection with PO4 tetrahedra.

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