2H and 14N NMR Studies of the Dynamics in the Incommensurate Phases of Betaine Calciumchloride Dihydrate

Autor:	U. Häcker, K.-P. Holzer, J. Petersson, Dieter Michel
Rok vydání:	1995
Předmět:	Crystallography chemistry.chemical_compound Materials science Betaine chemistry Dynamics (mechanics) General Physics and Astronomy Physical and Theoretical Chemistry Mathematical Physics
Zdroj:	Zeitschrift für Naturforschung A. 50:368-372
ISSN:	1865-7109 0932-0784
Popis:	2H and 14N NMR spin-lattice relaxation rates were measured in the structurally incommensurately (IC) modulated phases of deuterated and undeuterated betaine calciumchloride dihydrate, respectively. The results are related to the elementary excitations of these phases. The presence of low-frequency phase fluctuations of the modulation wave leads to higher spin-lattice relaxation rates compared with the high-temperature normal phase and the commensurate (C) phases. The corresponding "phason" contributions are found to be nearly constant in the whole IC phases. In the IC phases near the transitions to the C phases the relaxation rates decrease due to the formation of the soliton lattice. This interpretation is in agreement with the results of previous dielectric measurements
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ecaad171f924c0e62ec3d4f5439e220b https://doi.org/10.1515/zna-1995-4-508 Zobrazit plný text záznamu