Phonon Softening and Pressure-Induced Phase Transitions in Quartz Structured Compound, FePO4

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dc.creatorMittal, R.
dc.creatorHermann, R. P.
dc.creatorAngst, M.
dc.creatorChaplot, S. L.
dc.creatorAlp, E. E.
dc.creatorZhao, J.
dc.creatorSturhahn, W.
dc.creatorHatert, F.
dc.date2009-03-09
dc.date.accessioned2026-07-07T12:50:28Z
dc.date.available2026-07-07T12:50:28Z
dc.descriptionNuclear resonant inelastic x-ray scattering on quartz structured 57FePO4 as a function of pressure, up to 8 GPa reveals hardening of the low-energy phonons under applied pressures up to 1.5 GPa, followed by a large softening at 1.8 GPa upon approaching the phase transition pressure of ~2 GPa. The pressure-induced phase transitions in quartz-structured compounds have been predicted to be related to a soft phonon mode at the Brillouin-zone boundary (1/3, 1/3, 0) and to the break-down of the Born-stability criteria. Our results provide the first experimental evidence of this predicted phonon softening.
dc.description6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0903.1550
dc.identifierhttp://arxiv.org/abs/0903.1550
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222694
dc.subjectMaterials Science
dc.subjectOther Condensed Matter
dc.titlePhonon Softening and Pressure-Induced Phase Transitions in Quartz Structured Compound, FePO4
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