I. Pop et al., MAGNETIC HIGH T-C SUPERCONDUCTING LIKE BEHAVIOR OF BETA-ALUMINA, BETA''-ALUMINA AND GAMMA-ALUMINA, Modern physics letters B, 11(16-17), 1997, pp. 739-743
beta,beta '' and gamma-Al2O3 samples were synthesized. The temperature
dependence of the magnetic susceptibility has anomalous diamagnetic-p
aramagnetic transitions, like Meissner effect, around 80 K, and conseq
uently high T-c superconducting like magnetic behavior.