Formation of sphalerite and wurtzite ZnO in Pd–Zn alloy after internal oxidation at elevated temperatures
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The crystalline structures of zinc oxide (ZnO) formed by the internal oxidation of a Pd–Zn alloy were examined at elevated temperatures. Metastable sphalerite ZnO with a tetrahedral shape preferentially nucleated in the Pd matrix, while plate-like precipitates consisting of a wurtzite ZnO phase preferentially grew at a high temperature. Unique ZnO precipitates with trapezoidal cross-section and consisting of inter-layered sequences with sphalerite ZnO and wurtzite ZnO were also examined at an intermediate temperature. It is inferred that the formation of stacking faults in the sphalerite ZnO is strongly related to the nucleation of the wurtzite-type ZnO sequence.
KeywordsOrientation Relationship Volume Energy HRTEM Image Internal Oxidation Misfit Dislocation
The authors would like to thank Mr. K. Sugawara and Mr. K. Ohkubo at HVEM laboratory, CAREM, Hokkaido University for their technical supports in the HVEM observations.
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