Temperature Dependence of Paramagnetic Relaxation at Point Defects in Vitreous Silica
- 1 January 1965
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 36 (1) , 124-128
- https://doi.org/10.1063/1.1713857
Abstract
Spin relaxation has been measured at 3 kOe and at lattice temperatures from 1.24° to 250°K for the E′ centers generated in one type of vitreous silica by 2‐MeV gamma rays. An unusual temperature dependence was found in which the spin‐lattice relaxation time varies roughly as T−2,5 over most of the range. All of the data are accurately fitted by analytical functions derived from a coupling of the individual defect centers to the vitreous host involving excess local strain due to mechanical resonances of about 4.1×1011 and 6.0×1012 cps at each E′ center. The strength of the coupling and the characteristic frequencies of mechanical resonance are similar to those in crystalline SiO2.This publication has 17 references indexed in Scilit:
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