Temperature and concentration dependences of the spin-lattice relaxation rate in four borate glasses doped with Fe2O3
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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.
KeywordsExchange Interaction Glass Sample Amorphous Silicon Borate Glass Linear Temperature Dependence
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