J. Phys. IV France
Volume 126, June 2005
Page(s) 33 - 37

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

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{1}$0}, {11 $\overline{2}$0}, and pyramid {10 $\overline{1}$1}. For {$\bar{1}$0 $\overline{1}$0} plane, the fracture toughness coefficient K$_{1\rm C}$ was found to be K $_{1\rm C}{\sim}$0.09 MPa m1/2, 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.

© EDP Sciences 2005