摘要 : We measured zirconium tungstate's elastic constants C_(ij). This compound shows relatively soft, nearly isotropic elastic constants with normal Poisson ratios and no approach to Born instability. ZrW_2O_8 shows normal ambient-temp... 展开 We measured zirconium tungstate's elastic constants C_(ij). This compound shows relatively soft, nearly isotropic elastic constants with normal Poisson ratios and no approach to Born instability. ZrW_2O_8 shows normal ambient-temperature elastic constants C_(ij), but remarkable dC_(ij) / dT that show dominant low-frequency acoustic-vibration modes. From the bulk modulus, we estimated the total ambient-temperature thermodynamic Grueneisen parameter as γ = -1.2. The dB/dT slope gives a Grueneisen parameter γ = - 7. The 300-0 K bulk-modulus increase (40%) seems unprecedented and breaks Birch's law of corresponding states. 收起