Pressure‐induced phase transition in Co‐doped ZnO

Abstract

AbstractHigh‐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%. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)