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Mineralogical Magazine; June 2000; v. 64; no. 3; p. 435-440
© 2000 Mineralogical Society of Great Britain and Ireland
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Floppy modes and the Boson peak in crystalline and amorphous silicates: an inelastic neutron scattering study

M. J. Harris1, M. T. Dove2,* and J. M. Parker3

1 ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
2 Mineral Physics Group, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
3 Department of Engineering Materials, Sheffield University, Mappin Street, Sheffield S1 3JD, UK

* E-mail: martin{at}esc.cam.ac.uk

We present the results of an inelastic neutron scattering study of a crystalline polymorph of SiO2 ({alpha}-quartz), and a number of silicate glasses (pure silica, SiO2, and three glasses in the alkali silicate series (K,Li)2Si2O5). We demonstrate the presence of the Boson peak in the inelastic spectra of both the crystalline and amorphous materials and argue that it arises simply from the dispersion characteristics of transverse acoustic modes. Furthermore, we investigate the role of the lower-energy floppy modes in the inelastic spectra, and show that they are controlled by chemical effects.

KEYWORDS: floppy modes, Boson peak, silicates, neutron scattering, inelastic spectra




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