Temperature and concentration dependences of the spin-lattice relaxation rate in four borate glasses doped with Fe2O3

Autor:	P. K. Zinsou, Sushil K. Misra, J. Pescia, D. Vergnoux, R. Berger, G. Ablart
Rok vydání:	1996
Předmět:	Nuclear magnetic resonance Solid-state physics Chemistry Doping Relaxation (NMR) Exchange interaction Spin–lattice relaxation chemistry.chemical_element Thermodynamics Atmospheric temperature range Boron Atomic and Molecular Physics and Optics Ion
Zdroj:	Applied Magnetic Resonance. 11:487-492
ISSN:	1613-7507 0937-9347
DOI:	10.1007/bf03162243
Popis:	Spin-lattice relaxation time (T 1) of Fe3+ ions has been measured in four borate glasses doped with 0.25, 0.5, 1 and 3 wt.% Fe2O3 by the modulation method over the temperature range 5–250 K. In the three less concentrated samples, it was observed thatT 1 −1. αT at intermediate temperatures. This is explained in terms of a relaxation mechanism involving TLS (Two Level Systems). At higher temperatures, the temperature dependence ofT 1 −1 is slowed down by cross-relaxation. In the most concentrated sample, the exchange interaction plays a dominant role leading to a very different relaxation-time behaviour, described well by the Bloembergen and Wang three-reservoir model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e289474aae6302a10a16abc2366d8f0d https://doi.org/10.1007/bf03162243 Zobrazit plný text záznamu Full text from SpringerLink