A high-pressure study of Ti₃O₅ by X-ray diffraction and synchrotron radiation. 1. Pressures up to 38.6 GPa

High-pressure X-ray diffraction studies have been performed on powder samples of β-Ti₃O₅ (C2/m) for pressures up to 38.6 GPa using synchrotron radiation and a diamond-anvil cell. The compressibility is highly anisotropic. Thus, the compression Δl/l₀ for the maximum pressure investigated is 5.4, 0.8 and 6.7% for the unit-cell axis directions a, b and c, respectively. The anisotropy is reasonable, considering the crystal structure. The bulk modulus B₀, determined from the Murnaghan equation, is 173(10) GPa and B′₀ is 7(1).