NOISE-LIKE MAGNETIC-RESONANCE ABSORPTION IN ZEOLITES

Unusual X-band magnetic resonance spectra have been observed over the 77-500 K temperature range in polycrystalline specimens of zeolites tr eated to thermal oxidation. Narrow individual lines form a noise-like spectrum over the whole magnetic field scan range (up to 8000 G). Howe ver, the pattern differs from the real noise by strict reproducibility . A simple model is proposed to account for the phenomenon as the over lapping resonance lines of a large number of randomly oriented ferroma gnetic microcrystal impurities. (C) 1998 Elsevier Science B.V.