[SMP36-P03] The influence of OH content on elastic constants of single-crystal topaz studied via sphere-resonance method
Keywords:Topaz, Elastic constants, Water
Sphere samples (D=2.6~6.5 mm) were made from single crystals of natural topaz by the two-pipe method. Lattice parameters were determined and orthorhombic symmetry was confirmed by XRD. Resonant frequencies were measured with different specimen-holding forces. Extrapolating to the specimen-holding force of zero, we obtained frequencies of "free" oscillation. Elastic constants were determined by comparing measured and calculated resonant frequencies. The xyz algorithm (Visscher et al., 1991) was employed to calculate resonant frequencies of the sphere samples. At an ambient temperature, Our determined elastic constants C11, C22, C44, C66, C12, C23 and C31 increase with increasing OH molar content, while C33 and C55 decrease. These changes are similar to those seen in theoretical values (Ulian and Valdre, 2017) except for C11, though there are significant differences between experimental and theoretical values.