Elasticity and sound velocities of polycrystalline grossular garnet (Ca3Al2Si3O12) at simultaneous high pressures and high temperatures
| Autor: | Gabriel D. Gwanmesia, Robert C. Liebermann, Liping Wang, Adaire Heady |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Ultrasonic interferometry
Grossular Materials science Physics and Astronomy (miscellaneous) Mineralogy Thermodynamics Astronomy and Astrophysics Shear modulus Geophysics Space and Planetary Science visual_art High pressure Calcium content visual_art.visual_art_medium Crystallite Elasticity (economics) Elastic modulus |
| Zdroj: | Physics of the Earth and Planetary Interiors. 228:80-87 |
| ISSN: | 0031-9201 |
| DOI: | 10.1016/j.pepi.2013.09.010 |
| Popis: | The elastic wave velocities of a dense polycrystalline specimen (99.7% of theoretical density) of synthetic grossular garnet (Ca 3 Al 2 Si 3 O 12 ) were measured to pressures of ∼10 GPa and temperatures of 1000 K by transfer-function ultrasonic interferometry in conjunction with energy-dispersive synchrotron X-radiation in a deformation DIA-type cubic-anvil apparatus. The calculated elastic bulk ( K s ) and shear ( G ) moduli data were fitted to functions of Eulerian strain to 3rd order, yielding the zero-pressure values [ K s = 171.2 (8) GPa; G = 107.4 (2) GPa] and their pressure derivatives [(∂ K s /∂ P ) T = 4.47 (2); (∂G/∂P ) T = 1.29 (5)]. The temperature dependences of the elastic moduli obtained from linear regression of entire P – T – K s and P – T – G data are: ( ∂K s / ∂T ) P = −1.38 (3) × 10 −2 GPa/K and (∂ G /∂ T ) P = −1.28 (2) × 10 −2 GPa/K. These results together with those from previous studies for garnets with varying compositions suggest that most of the thermo-elastic properties of garnet are insensitive to grossular content, with the exception of the shear modulus, which significantly depends on the calcium content. |
| Databáze: | OpenAIRE |
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