ELASTIC-CONSTANTS OF TETRAGONAL ZIRCONIA MEASURED BY A NEW POWDER DIFFRACTION TECHNIQUE

Elastic constants for 12 mol% Ce-doped tetragonal zirconia have been d etermined from peak shifts in neutron diffraction patterns recorded un der applied uniaxial stress. When these diffraction data are combined with a measured value of Young's modulus, a complete set of elastic co nstants is obtained. The values are c(11) = 327, c(12) = 100, c(13) = 62, c(33) = 264, c(44) = 59, and c(66) = 64 (units: GPa). These are th e first reported results using a new technique for the measurement of elastic constants for anisotropic materials via neutron diffraction me asurements on polycrystalline samples.