NMR study of monomethylammonium cation in (CH3NH3)(5)Bi2Cl11 ferroelectricpolycrystal

Authors
Medycki, W
Citation
W. Medycki, NMR study of monomethylammonium cation in (CH3NH3)(5)Bi2Cl11 ferroelectricpolycrystal, SOL ST NUCL, 13(4), 1999, pp. 213-218
Citations number
9
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SOLID STATE NUCLEAR MAGNETIC RESONANCE
ISSN journal
09262040 → ACNP
Volume
13
Issue
4
Year of publication
1999
Pages
213 - 218
Database
ISI
SICI code
0926-2040(199905)13:4<213:NSOMCI>2.0.ZU;2-A
Abstract
Spin-lattice relaxation times T-1 and T-1 rho are determined for protons in three polycrystals (CH3NH3)(5)Bi2Cl11, (CD3NH3)(5)Bi2Cl11 and (CH3ND3)(5)B i2Cl11. The temperature dependencies of the relaxation times obtained for ( CH3NH3)(5)Bi2Cl11 and (CD3NH3)(5)Bi2Cl11 are interpreted as a result of cor related motions of the three-proton groups of the monomethylammonium cation . The minimum of the T-1 rho relaxation time is explained as a result of th e oscillations of the symmetry axis of the whole cation. (C) 1999 Elsevier Science B.V. All rights reserved.