3 ms·
Alumina is Al2O3 generally, and usually it is polycrystalline. Sapphire is specifically Al2O3 in a certain (very hard) crystal structure.
by gjmulhol 11y ago
Alumina is Al2O3 generally, and usually it is polycrystalline. Sapphire is specifically Al2O3 in a certain (very hard) crystal structure.