Abstract
Solid solutions between zinc oxide and magnesium oxide containing up to 4at.% Mg were grown from the melt using a modified Bridgman technique. Chemical analysis (ICP-OES) and photoluminescence (PL) measurements revealed that the Mg concentration in the melt is larger compared with the starting material. This observation contradicts the commonly accepted assumption, that the ZnO–MgO phase diagram is of eutectic type. Peritectic melting of Zn-rich Zn1−xMgxO can explain the new experimental results, and a new ZnO–MgO phase diagram is proposed. Furthermore a distribution coefficient for Mg of keff=1.32…1.4 has been determined.
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