Constant Q measurements of collective modes in Mg{sub 70}Zn{sub 30} glass

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In this study the Neutron Brillouin Scattering technique has been used to measure longitudinal excitations in a magnesium-zinc glass at momentum transfers within the first pseudo-Brillouin zone. The measurements were performed at room temperature and constant momentum transfer, which enables the data to be readily and reliably compared with theory. The experimental results taken down to Q = 6.2 nm{sup {minus}1} and E = 27 meV show a 5 meV downward shift in the dispersion energy of the longitudinal optic mode of the glass when compared to theoretical predictions.

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7 p.

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Benmore, C.J.; Sweeney, S.; Robinson, R.A.; Egelstaff, P.A. & Suck, J.B. November 1, 1997.

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  • Benmore, C.J. Rutherford Appleton Lab., Chilton (United Kingdom). ISIS Facility
  • Sweeney, S. Univ. of Guelph, Ontario (Canada). Dept. of Physics
  • Robinson, R.A. Los Alamos National Lab., NM (United States)
  • Egelstaff, P.A. Univ. of Guelph, Ontario (Canada). Dept. of Physics
  • Suck, J.B. T.U. Chemnitz-Zwickau, Chemnitz (Germany). Inst. fuer Physik

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Description

In this study the Neutron Brillouin Scattering technique has been used to measure longitudinal excitations in a magnesium-zinc glass at momentum transfers within the first pseudo-Brillouin zone. The measurements were performed at room temperature and constant momentum transfer, which enables the data to be readily and reliably compared with theory. The experimental results taken down to Q = 6.2 nm{sup {minus}1} and E = 27 meV show a 5 meV downward shift in the dispersion energy of the longitudinal optic mode of the glass when compared to theoretical predictions.

Physical Description

7 p.

Notes

INIS; OSTI as DE98001170

Source

  • International conference on neutron scattering (ICNS), Toronto (Canada), 17-21 Aug 1997

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  • Other: DE98001170
  • Report No.: LA-UR--97-2952
  • Report No.: CONF-970814--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 548705
  • Archival Resource Key: ark:/67531/metadc693636

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 29, 2016, 1:41 p.m.

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Benmore, C.J.; Sweeney, S.; Robinson, R.A.; Egelstaff, P.A. & Suck, J.B. Constant Q measurements of collective modes in Mg{sub 70}Zn{sub 30} glass, article, November 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc693636/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.