Physics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...50..251k&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 50, Issue 3, p. 251-260.
Physics
33
Scientific paper
The single-crystal elastic constants of NaAlSi2O6, jadeite, have been measured at 1 bar and 20°C by Brillouin spectroscopy techniques. The elastic moduli are (in GPa): C11 = 274; C22 = 253, C33 = 282, C44 = 88, C55 = 65, C66 = 94, C12 = 94, C13 = 71, C23 = 82, C15 = 4, C25 = 14, C35 = 28, C46 = 13.
The compressional and shear acoustic velocities calculated from the single-crystal elastic moduli are comparable in value with those from ultrasonic measurements on polycrystalline aggregate specimens at elevated hydrostatic pressures, but not with the low pressure ultrasonic results owing to the existence of cracks, pores and voids in the polycrystalline samples.
Compared to other pyroxenes, the elastic moduli of jadeite are large in magnitude with the exceptions of C55 and C13. The elastic stiffness of the jadeite crystal structure is largely due to the presence of aluminum and sodium in the structure. The values of C55 and C13 are similar to those of other pyroxenes as these moduli are most sensitive to structural features that are common to all pyroxenes, regardless of spatial symmetry. The amount of geometrical linkage between the M1 and M2 polyhedra affects the moduli associated with deformation in the (010) direction (C44, C66, C12, C23).
Kandelin John
Weidner Donald J.
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