Abstract
In the castings of the workable glass ceramic ilmavit(R)40, the precipitation form of the different oxidic iron species of the crystalline and amorphous phases occuring in the structure is dependent on the cooling rate. The distribution of the existing iron species along the cross-section of the casting is not constant. It is assumed that the concentration gradient of the secondary magnetite over the cross-section of the casting originates from the predominant incorporation of the Fe(II) into the sodium fluorine phlogopite (SFP) at low cooling rates and consequently its non-availability for the secondary crystallization of magnetite in the rest glass phase. The Fe(III) not bound in the magnetite remains primarily solved in the rest glass phase.
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