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JKMRS Volume 18, No 1, pp 15-23; Nucleus–phonon interact...
2014년 06월 20일 / 조회수: 747

Nucleusphonon interactions of MCsSO4 (M=Na,K,orRb) single crystals studied using spinlattice relaxation time

Jae Hun Choi, Nam Hee Kim, and Ae Ran Lim···············································································15


Abstract   The structural properties and relaxation processes of MCsSO4 (M = Na, K, or Rb) crystals were investigated by measuring the NMR spectra and spin–lattice relaxation rates 1/T1 of their 23Na, 39K, 87Rb, and 133Cs nuclei. According to the NMR spectra, the MCsSO4 crystals contain two crystallographically inequivalent sites each for the M and Cs ions. Further, the relaxation rates of all these nuclei do not change significantly over the investigated temperature range, indicating that no phase transitions occur in these crystals in this range. The variations in the 1/T1 values of the 23Na, 39K, 87Rb, and 133Cs nuclei in these three crystals with increasing temperature are approximately proportional to T2, indicating that Raman processes may be responsible for the relaxation. Therefore, for nuclear quadrupole relaxation of the 23Na, 39K, 87Rb, and 133Cs nuclei, Raman processes with n = 2 are more effective than direct processes.

 

Keywords: NaCsSO4, KCsSO4, RbCsSO4, Nuclear magnetic resonance, Raman process, Relaxation time.

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