EFFECT OF UNIAXIAL STRESS ON THE VIBRATIONAL MODES IN QUARTZ,
Abstract
The detailed lineshapes of five Raman lines were measured for an alpha-quartz sample as a function of applied uniaxial stress. It was observed that the vibrational frequencies and line intensities increased, and the linewidths initially decreased with the application of compressive stress. As an example, the frequency of the 207 reciprocal cm A1-mode increased 3.85 reciprocal cm, its intensity increased 30% and its linewidth decreased 3.5 reciprocal cm for an applied stress of 3 x 10 to the 9th power dynes/sq cm. The stress induced shifts for the three A1-lines were observed to have a non-monotonic frequency dependence. The valence-force model used for calculating normal mode frequencies was modified by including the effects of an anharmonic potential and applied stress. This modified model was used to predict the stress induced changes in frequency for the four A1-modes in quartz. The predicted shifts are of the same order of magnitude as those measured and possess the observed nonmonotonic frequency dependence. The results of the calculations and measurements demonstrate the differing characteristics of the A1-modes lie in the motion of the oxygen atoms. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1969
- Accession Number
- AD0700116
Entities
People
- Chiao Y. She
- David F. Edwards
- Yale D. Harker
Organizations
- Colorado State University