7Li NMR spectra and spin-lattice relaxation in lithium heptagermanate single crystal. Issue 1 (3rd April 2020)

• Record Type: Journal Article
• Authors: Vogel, M.; Petrov, O.; Trubitsyn, M.; Nesterov, O.; Volnianskii, M.
• Is Part Of: Ferroelectrics. Volume 558:Issue 1(2020)
• Page Start: 46
• Page End: 58
• Publication Date: 2020-04-03
• Subjects: Li2Ge7O15 single crystal -- NMR spectra -- NMR spin-lattice relaxation; Ferroelectricity -- Periodicals; Ferroelectric crystals -- Periodicals; 537
• DOI: 10.1080/00150193.2020.1735888
• Languages: English
• ISSNs: 0015-0193

Abstract

Abstract: 7 Li NMR spectra and spin-lattice relaxation in Li2 Ge7 O15 single crystal have been analyzed. It is shown that the NMR spectrum consists of quadrupolar triplets from 7 Li ( I = 3/2) nuclei located in structurally nonequivalent Li(1) and Li(2) sites ( T = 300 K). On heating the quadrupolar splitting decreases as a result of thermal vibrations of 7 Li quadrupolar axes whereas NMR lines narrow due to translational motion of lithium ions. Measurements of the spin-lattice relaxation rate T1 −1 give information about the time scale and the activation energy of lithium ions motion. The results of NMR studies are compared with findings from electrical conductivity measurements.