Synthesis and characterization of polycrystalline KAlSi3O8 hollandite [liebermannite]: Sound velocities vs. pressure to 13 GPa at room temperature - 09/05/19
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Abstract |
A polycrystalline specimen of liebermannite [KAlSi3O8 hollandite] was synthesized at 14.5GPa and 1473 K using glass starting material in a uniaxial split-sphere apparatus. The recovered specimen is pure tetragonal hollandite [SG: I4/m] with bulk density of within 98% of the measured X-ray value. The specimen was also characterized by Raman spectroscopy and nuclear magnetic resonance spectroscopy. Sound velocities in this specimen were measured by ultrasonic interferometry to 13GPa at room T in a uniaxial split-cylinder apparatus using Al2O3 as a pressure marker. Finite strain analysis of the ultrasonic data yielded KS0=145(1)GPa, K0′=4.9(2), G0=92.3(3)GPa, G0′=1.6(1) for the bulk and shear moduli and their pressure derivatives, corresponding to VP0=8.4(1)km/s,VS0=4.9(1)km/s for the sound wave velocities at room temperature. These elasticity data are compared to literature values obtained from static compression experiments and theoretical density functional calculations.
Le texte complet de cet article est disponible en PDF.Keywords : Sound velocities, High pressure, Ultrasonics
Plan
Vol 351 - N° 2-3
P. 113-120 - février 2019 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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