Abstract
Inelastic neutron scattering has been performed onpara-terphenyl at temperatures from 10 to 200 K and under pressures from the ambient pressure to 1.51 kbar. The temperature dependence of phonons, especially low-frequency librational bands, indicates strong anharmonic phonon dynamics. The pressure- and temperature-dependence of the phonon modes suggest a lack of phase transition in the region of 0-1.51 kbar and 10-30 K. Additionally, the overall lattice dynamics remains similar up to 200 K under the ambient pressure. The results suggest that the boundary between the ordered triclinic phase and the third solid phase, reported at lower temperatures and higher pressures, is out of the pressure and temperature range of this study.
| Original language | English |
|---|---|
| Pages (from-to) | 8792-8799 |
| Number of pages | 8 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 23 |
| Issue number | 14 |
| DOIs | |
| State | Published - Apr 14 2021 |
Funding
C. L. and Q. C. acknowledge the support of University of California, RiversideviaInitial complement. Research at Los Alamos Neutron Science Center's spallation neutron source was sponsored by the National Nuclear Security Administration, DOE. Research at Oak Ridge National Laboratory's SNS was sponsored by the Scientific User Facilities Division, BES, DOE. C. L. and Q. C. acknowledge the support of University of California, Riverside via Initial complement. Research at Los Alamos Neutron Science Center’s spallation neutron source was sponsored by the National Nuclear Security Administration, DOE. Research at Oak Ridge National Laboratory’s SNS was sponsored by the Scientific User Facilities Division, BES, DOE.
| Funders | Funder number |
|---|---|
| Scientific User Facilities Division | |
| U.S. Department of Energy | |
| University of California | |
| Basic Energy Sciences | |
| National Nuclear Security Administration | |
| Oak Ridge National Laboratory | |
| University of California, Riverside |