Introduction Although α-Fe2O3 is promising anode material of LIB for excellent theoretical capacity as 1007 mAhg-1, it shows the severe cycle deterioration due to conversion reaction during the charge-discharge process. We have considered that the formation of Fe2O3-Al2O3 solid solution allows the Fe ions to react reversibly around the original site in the corundum-type structure. Although both α-Fe2O3 and α-Al2O3 have the corundum-type structure, solid solution ranges are restricted within 10% from the both end components [1]. In recent years, we have successfully obtained the Fe2O3-Al2O3 solid solution for all the compositional range through the mechanochemical synthesis method. It was also found that the obtained solid solution shows good cycle characteristics as an anode material of LIB [2]. Nevertheless, this solid solution has just been newly found and any magnetic property has not been clarified yet. In this study, we have carried out the Mössbauer measurement to discuss the magnetic properties of Fe2O3-Al2O3 solid solution. Experimental The solid solutions of (Fe2O3)1-x(Al2O3)x (x = 0, 0.1, 0.25, 0.33, 0.50 and 0.67) were prepared by mechanical alloying method. About 0.5 g of the stoichiometric mixtures of γ-Fe2O3 and γ-Al2O3 were put into a silicon nitride milling vessel with 20 ml in volume accompanied by 10 silicon nitride balls with 10 mm in diameter without any solvent. A planetary ball milling machine has been operated with the rotation speed of 800 rpm for 240 min. Mössbauer measurement was performed on the obtained samples of (Fe1-xAlx)2O3 (x = 0, 0.1, 0.25, 0.33 ,0.50 and 0.67) at room temperature. 57Co was used as a gamma ray source for Mössbauer measurement. Results and Discussions Fig. 1 shows the Mössbauer spectra of (Fe1-xAlx)2O3 measured at room temperature for x = 0, 0.1, 0.25, 0.33, 0.5 and 0.67. For the Fe2O3 (x = 0) obtained by milling, the sextet spectrum was observed. This would correspond to weak ferromagnetism appearing from a cant structure, in which the spin of Fe is slightly inclined from 90° to the c-axis direction. This spectrum is essentially similar to the α-Fe2O3 reagent without milling. The Mössbauer spectra gradually changed into doublet with increasing the concentration of aluminum x and the change is almost completed to the x = 0.5. Fourier transform of the EXAFS signal shows that |χ| peak value around 1.5 Å corresponding to Fe-O distance did not vary significantly, while that around 2.5 Å for Fe-Fe distance decrease with x. Dilution of Fe3+ with Al3+ would result in the change in spin interaction, or (Fe1-xAlx)2O3 changes from weak ferromagnetism to the paramagnetic state by reducing spin interaction.