Journal de Physique IV

Sommaire

J. Phys. IV France 126 (2005) 33-37
DOI: 10.1051/jp4:2005126007

Zinc oxide single crystals: Temperature and radiation effect on firmness and plasticity

L.N. Dem'yanets and N.L. Sizova

Institute of Crystallography RAS, Leninsky Pr. 59, Moscow 119333, Russia

Abstract
Mechanical properties of bulk ZnO single crystals are studied depending on crystallographic orientation, temperature and radiation. The shapes of the indenter prints and dislocation rosettes were analyzed for the faces of monohedron (0001), hexagonal prisms {10 $$\overline, {11  <IMG WIDTH=$ 0 $$\overline plane, the fracture toughness coefficient K<IMG WIDTH=$ was found to be K $_{1\rm C}{\sim}$ 0.09 MPa m^1/2, Young modulus E = 47.7 GPa, microhardness H = 1.7 GPa, coefficient of surface energy of destruction $\gamma$ = 0.085 J/m². For (0001) face H = 4.2 GPa.