Phase transition and relaxation processes by 87Rb and 39K nuclear magnetic measurements of RbKSO4 single crystals

• Published in: The Journal of physics and chemistry of solids 2012-04, Vol.73 (4), p.545-549
• Main Authors: Kang, Kihyeok, Mean, Byoung-Jean, Kim, Sung Hoon, Lee, Moohee, Lim, Ae Ran
• Format: Article
• Language: English
• Subjects: Asymmetry; B. Crystal growth; D. Crystal structure; D. Ferroelectricity; D. Nuclear magnetic resonance (NMR); D. Phase transitions; Nuclear magnetic resonance; Phase transformations; Quadrupole interaction; Quadrupoles; Single crystals; Spectral lines; Spin-lattice relaxation
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2011.12.003

87Rb and 39K nuclear magnetic resonance (NMR) spectra of RbKSO4 single crystals were measured at room temperature. 87Rb central line has the angular dependences of second-order quadrupolar shifts. From these results, the quadrupole coupling constant and the asymmetry parameter were determined at room temperature. In addition, the spin–lattice relaxation rate, 1/T1, and the spin–spin relaxation rate, 1/T2, were measured as a function of temperature. The values of 1/T1 for the 87Rb and 39K nuclei were found to increase with increasing temperature, and 1/T1 was determined to be proportional to Tn. Therefore, for the 87Rb and 39K nuclei, Raman processes with n=2 are more significantly in nuclear quadrupole relaxation than direct processes. ► 87Rb central line has the angular dependences of second-order quadrupolar shifts. ► The quadrupole coupling constant and the asymmetry parameter were determined. ► The spin–lattice relaxation rate, 1/T1, for the 87Rb and 39K nuclei. ► Raman processes with n=2 for the 87Rb and 39K nuclei.