Static compression of Al2O3 to 1.2 Mbars (120 GPa)

摘要

Pressures up to 120 GPa were generated when a diamond indentor of radius 10.0 μm was pressed against a very thin sample of Al2O3 on a diamond flat. The thin film of Al2O3 was prepared by sputtering of aluminum in an oxygen atmosphere. From the measurement of the electrical resistance of Al2O3 as a function of pressure it was found that Al2O3 remains an insulator at the highest pressure studied, namely, 120 GPa.