Pressure-induced Phase Transition of Co-doped ZnO

Y.Mori, N.Niiya, T.Mizuno, T.Nishii, A.Fujii, Y.Fujii, K.Takarabe, Y.Wang, and J.Z.Jiang

ZnO, high-pressure, Co-dope, phase transition
High-pressure X-ray diffraction studies of Cox Zn1–x O (x = 0, 0.05, 0.10) were carried out with a synchrotron radiation source. The crystal parameters for three samples under pressure were refined by the Rietveld method. The bulk moduli for Cox Zn1–x O (x = 0, 0.05, 0.10) were determined by Birch’s equation of state to be 144.9 ± 0.6, 143.4 ± 4.2, and 138.5 ± 1.9 GPa, and also the transition pressure from the wurtzite structure to the rocksalt structure were determined to be 8.2, 7.7, and 6.1 GPa, respectively. On increasing
the Co-doping into the ZnO, both the bulk moduli and transition pressures decrease, but the rates
are quite different. The bulk modulus decreases by 4.8% with 10% Co-doping but the transition pressure
decreases by 25%.

phys. stat. sol. (b)

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