Boson peak measurements in neutron-irradiated quartz crystals

M. A. Parshin, C. Laermans () and V. G. Melehin

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 49, issue 1, 47-57

Abstract: We have measured the low-frequency Raman scattering in neutron-irradiated quartz crystals with four different irradiation doses from 4.7×10 19 n/cm 2 to 1×10 20 n/cm 2 and for 2 different crystallographic directions. For the used doses the range of density change of the investigated samples was 12% (the maximum change during amorphization is 14%) and the amorphous fraction varied from 35% to 100%. The same measurement was done in neutron-irradiated amorphous silica with a maximal dose 2×10 20 n/cm 2 . In all cases we observed the boson peak in the Raman spectra. The position of the peak, at 67±3 cm -1 , was found to be the same for all the investigated samples independent of the dose. The shape of the peak for doses 6.8× 10 19 n/cm 2 and higher was also found to be the same for 5 investigated samples (including irradiated vitreous silica). We found that the position of the boson peak in neutron-irradiated quartz crystals and vitreous silica corresponds to the Ioffe-Regel crossover frequency for phonons. The origin of the boson peak in neutron-irradiated quartz and vitreous silica can be attributed to local soft optic modes, which are analogous to the soft optic mode that drives the α–β transition in quartz. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Date: 2006
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DOI: 10.1140/epjb/e2006-00018-0

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