title: Elastic-Stiffness Coefficients of Titanium Diboride.
abstract: Using resonance ultrasound spectroscopy, we measured the monocrystal elastic-stiffness coefficients, the Voigt C ij, of TiB2. With hexagonal symmetry, TiB2 exhibits five independent C ij: C 11, C 33, C 44, C 12, C 13. Using Voigt-Reuss-Hill averaging, we converted these monocrystal values to quasiisotropic (polycrystal) elastic stiffnesses. Briefly, we comment on effects of voids. From the C ij, we calculated the Debye characteristic temperature, the Grüneisen parameter, and various sound velocities. Our study resolves the enormous differences between two previous reports of TiB2's C ij.
authors: Mechanical Engineering University of Colorado Boulder, Colorado 80309.
authors: Hassel
authors: H
authors: Ledbetter
authors: National Institute for Materials Science, Sengen, Namiki, Tsukuba, Ibaraki 305-0047 Japan.
authors: Takaho
authors: T
authors: Tanaka
keywords: Debye temperature; Grüneisen parameter; elastic constants; hexagonal crystal; monocrystal; sound velocities; titanium diboride; voids