High-pressure lattice dynamics in bulk single-crystal BaWO4

Details High-pressure lattice dynamics in bulk single-crystal BaWO4 High-pressure lattice dynamics in bulk single-crystal BaWO4

2006-05-26

arxiv.org/abs/cond-mat/0605647v1

Physics

Condensed Matter

Materials Science

55 pages, 6 Postscript figures, sent to Phys. Rev. B

Scientific paper

Room-temperature Raman scattering has been measured in barium tungstate (BaWO4) up to 16 GPa. We report the pressure dependence of all the Raman-active first-order phonons of the tetragonal scheelite phase (BaWO4-I, space group I41/a), which is stable at normal conditions. As pressure increases the Raman spectrum undergoes significant changes around 6.9 GPa due to the onset of the structural phase transition to the monoclinic BaWO4-II phase (space group P21/n). This transition is only completed above 9.5 GPa. A further change in the spectrum is observed at 7.5 GPa related to a scheelite-to-fergusonite transition. The scheelite, BaWO4-II, and fergusonite phases coexist up to 9.0 GPa due to the sluggishness of the I?II phase transition. Further to the experimental study, we have performed ab initio lattice dynamics calculations that have greatly helped us in assigning and discussing the pressure behaviour of the observed Raman modes of the three phases.

Affiliated with

Also associated with

No associations

Rating

High-pressure lattice dynamics in bulk single-crystal BaWO4 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-pressure lattice dynamics in bulk single-crystal BaWO4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-pressure lattice dynamics in bulk single-crystal BaWO4 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-238244