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The magnetism of Al$_x$Fe$_{2-x}$GeO$_5$ from $x$ = 0.09 to $x$ = 0.91 withandalusite structure was examined. The magnetic properties ofAl$_x$Fe$_{2-x}$GeO$_5$ at low temperatures were found to be weakferromagnetic-like state for $x$ $<$ 0.3 and spin-glass state for $x$ $>$ 0.3.The small spontaneous magnetization that appears in the weak ferromagnetic-likephase would be due to the presence of Dzyaloshinsky-Moriya interaction or tothe difference in the magnitude of the magnetic moment of Fe$^{3+}$ in theoctahedral and trigonal bipyramidal sites. The appearance of the spin-glassphase indicates that the dilution of Fe ions by Al ions inAl$_x$Fe$_{2-x}$GeO$_5$ causes the competition between ferromagnetic andantiferromagnetic interactions. The $x$ dependence of the site occupancy of Feions suggests that Fe$_2$GeO$_5$ with andalusite structure cannot besynthesized.

Magnetism of Al$_x$Fe$_{2-x}$GeO$_5$ with Andalusite Structure