Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5420851 | Solid State Nuclear Magnetic Resonance | 2007 | 5 Pages |
Abstract
1H NMR spin-lattice relaxation time measurements have been carried out in [(CH3)4N]2SeO4 in the temperature range 389-6.6Â K to understand the possible phase transitions, internal motions and quantum rotational tunneling. A broad T1 minimum observed around 280Â K is attributed to the simultaneous motions of CH3 and (CH3)4N groups. Magnetization recovery is found to be stretched exponential below 72Â K with varying stretched exponent. Low-temperature T1 behavior is interpreted in terms of methyl groups undergoing quantum rotational tunneling.
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Authors
K.J. Mallikarjunaiah, K.C. Paramita, K.P. Ramesh, R. Damle,