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The dielectric and magnetic properties of garnet depend essentially on the stoechiometry of their composition. The oxide mixture process should be improved since the utilisation of ball grinders does not provide for a systematically constant ratio of the oxides. Wear and tear in the mixing machines pollutes the mixture by an addition of powdered iron with a degree of oxidation which, during the heat treatment, is a function of the stoechiometric variation. Moreover, in order to obtain fine grained materials, it is necessary to carry out short duration sintering. This is facilitated by vacuum thermal atment; but in that case the shortcomings of the powder preparation are all the more apparent. These two improvements lead to materials with low stoechiometric variations and with excellent properties.