New phase boundary and high-pressure thermoelasticity of ZnO
Mineral Physics Institute, SUNY at Stony Brook - Stony Brook, NY
2 Department of Geosciences, SUNY at Stony Brook - Stony Brook, NY 11794, USA
Corresponding author: email@example.com
Accepted: 25 May 2000
The phase transition of zinc oxide from B4 (hexagonal wurtzite structure) to B1 (cubic rocksalt structure) has been studied by energy-dispersive powder diffraction technique up to 11 GPa and 1273 K. Analysis of equation-of-state (PVT) data for the rocksalt phase yields precise values of the bulk modulus and its temperature derivative. The previously accepted P-T phase diagram is shown to be incorrect. It is established that the B1 phase is not recoverable. The equilibrium transition pressure of the B4-to-B1 transformation is near 6 GPa (at ambient temperature) and the slope close to zero. These new results are confirmed by using simultaneously three other different types of experiment (imaging, ultrasonic and X-ray diffraction studies on single-crystal specimens).
PACS: 07.35.+k – High-pressure apparatus and techniques; shock tubes; diamond anvil cells / 64.70.Kb – Solid-solid transitions / 81.30.Dz – Phase diagrams of other materials
© EDP Sciences, 2000