Abstract

Zinc oxide, ZnO, can be synthesized into a variety of morphologies including nanowires, nanorods, tetrapods, nanobelts, nanoflowers, nanoparticles, etc., and zinc oxide nanomaterials are promising candidates for nanoelectronics and photonics. Doping in ZnO is one of the most efficient approaches to improve its structure and properties. Here we use the density-functional theory (DFT) to investigate the doping effect of Mn or Co on ZnO. Our calculation results reveal that the transition pressure from the wurtzite (B4) phase to the rocksalt (B1) phase of ZnO decreases with Mn or Co doping, which is consistent with the in situ high-pressure X-ray powder diffraction results from synchrotron radiation. For both Mn and Co doping, the doping effect on different structures of ZnO increases in the order: B1 < intermediate tetragonal structure < intermediate hexagonal structure < B4. This causes the decrease of the transition barrier between B4 and B1, which accounts for the decreased transition pressure of Mn- or C...

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