Cai, Qingan; McIntire, Michael; Daemen, Luke L.; Li, Chen; Chronister, Eric L.
Pressure- and temperature-dependent inelastic neutron scattering study of the phase transition and phonon lattice dynamics in para-terphenyl Journal Article
In: Physical Chemistry Chemical Physics, vol. 23, pp. 8792, 2021.
Abstract | Links | BibTeX | Tags: high pressure, phonon, Raman
@article{Cai2021,
title = {Pressure- and temperature-dependent inelastic neutron scattering study of the phase transition and phonon lattice dynamics in para-terphenyl},
author = {Qingan Cai and Michael McIntire and Luke L. Daemen and Chen Li and Eric L. Chronister},
url = {https://pubs.rsc.org/en/content/articlelanding/2021/cp/d1cp00190f#!divAbstract},
doi = {10.1039/D1CP00190F},
year = {2021},
date = {2021-03-24},
journal = {Physical Chemistry Chemical Physics},
volume = {23},
pages = {8792},
abstract = {Inelastic neutron scattering has been performed on para-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\textendash1.51 kbar and 10\textendash30 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.},
keywords = {high pressure, phonon, Raman},
pubstate = {published},
tppubtype = {article}
}
Inelastic neutron scattering has been performed on para-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.
Haberl, Bianca; Dissanayake, Sachith; Ye, Feng; Daemen, Luke L.; Cheng, Yongqiang; Li, Chen W.; Ramirez-Cuesta, A. -J.; Matsuda, Masaaki; Molaison, Jamie J.; Boehler, Reinhard
Wide-angle diamond cell for neutron scattering Journal Article
In: High Pressure Research, vol. 37, no. 4, pp. 495-506, 2017.
Abstract | Links | BibTeX | Tags: diamond anvil cell, diffraction, high pressure, neutron scattering
@article{Haberl2017b,
title = {Wide-angle diamond cell for neutron scattering},
author = {Bianca Haberl and Sachith Dissanayake and Feng Ye and Luke L. Daemen and Yongqiang Cheng and Chen W. Li and A.-J. Ramirez-Cuesta and Masaaki Matsuda and Jamie J. Molaison and Reinhard Boehler},
url = {https://www.tandfonline.com/doi/full/10.1080/08957959.2017.1390571},
doi = {10.1080/08957959.2017.1390571},
year = {2017},
date = {2017-10-19},
journal = {High Pressure Research},
volume = {37},
number = {4},
pages = {495-506},
abstract = {A new diamond cell with extreme apertures is described. It is tailored for a large variety of neutron scattering techniques such as inelastic neutron scattering and single-crystal diffraction both at the Spallation Neutron Source (SNS) and the High Flux Isotope Reactor at the Oak Ridge National Laboratory. Simple springs enable forces of over 10 metric tons to be clamped in for low-temperature measurements. At present, low-cost polycrystalline diamond (Versimax) pressure anvils are used. We predict a routine pressure regime up to 20 GPa with sample volumes of ∼0.5 mm3. Future use of large CVD single-crystal diamond anvils will significantly expand this pressure range. We show examples for measurements at the SNAP, VISION and CORELLI beamlines of the SNS.},
keywords = {diamond anvil cell, diffraction, high pressure, neutron scattering},
pubstate = {published},
tppubtype = {article}
}
A new diamond cell with extreme apertures is described. It is tailored for a large variety of neutron scattering techniques such as inelastic neutron scattering and single-crystal diffraction both at the Spallation Neutron Source (SNS) and the High Flux Isotope Reactor at the Oak Ridge National Laboratory. Simple springs enable forces of over 10 metric tons to be clamped in for low-temperature measurements. At present, low-cost polycrystalline diamond (Versimax) pressure anvils are used. We predict a routine pressure regime up to 20 GPa with sample volumes of ∼0.5 mm3. Future use of large CVD single-crystal diamond anvils will significantly expand this pressure range. We show examples for measurements at the SNAP, VISION and CORELLI beamlines of the SNS.