Abstract
The proton nuclear spin-lattice relaxation rates T 1 −1 of amorphous Zr 2PdH 2.9 and crystalline Zr 2PdH 1.9 were examined from 4 to 400 K at several frequencies. The observed temperature dependence is nearly T 1 −1 ∝ T, but the relaxation rate depends on frequency, unlike the behavior of the expected Heitler- Teller-Korringa mechanism. Furthermore, the relaxation rates in the crystalline and amorphous samples are surprisingly similar. The frequency dependence can be explained by two models: proton cross-relaxation to metal nuclei and low frequency tunneling motions.
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