Compressional and shear-wave velocities and unit-cell volumes of orthorhombic $\mathrm{Ca}\mathrm{Ge}{\mathrm{O}}_3$ perovskite have been measured up to $10\mathrm{GPa}$ at ambient temperature using ultrasonic interferometry in conjunction with synchrotron x radiation. Fitting all velocity and unit-cell volume data to finite-strain equations yields the zero-pressure adiabatic bulk and shear moduli and their pressure derivatives $K_{S0}=194.6$ $\left(11\right)\mathrm{GPa}$, $G_0=109.5$ $\left(5\right)\mathrm{GPa}$, $K_{S0}{}^{\prime }=6.4$ (2), $G_0{}^{\prime }=1.7$ (1), with an rms misfit of $0.009\mathrm{km}{\mathrm{s}}^{-1}$. From the data in the current study, we have observed no discontinuities or elasticity softening for either the bulk or shear moduli up to the peak pressure of $10\mathrm{GPa}$.

• Received 17 August 2006
• Accepted 12 October 2006

DOI:https://doi.org/10.1103/PhysRevB.75.024107