NMR study of monomethylammonium cation in (CH3NH3)5Bi2Cl11 ferroelectric polycrystal |
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| Authors: | Wojciech Medycki |
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| Institution: | Institute of Molecular Physics, PAS, Poznán, Poland. |
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| Abstract: | Spin-lattice relaxation times T1 and T1ρ are determined for protons in three polycrystals (CH3NH3)5Bi2Cl11, (CD3NH3)5Bi2Cl11 and (CH3ND3)5Bi2Cl11. The temperature dependencies of the relaxation times obtained for (CH3NH3)5Bi2Cl11 and (CD3NH3)5Bi2Cl11 are interpreted as a result of correlated motions of the three-proton groups of the monomethylammonium cation. The minimum of the T1ρ relaxation time is explained as a result of the oscillations of the symmetry axis of the whole cation. |
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| Keywords: | Monomethylammonium cation Spin-lattice relaxation time T1 Relaxation time T1ρ Correlated motions |
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