Dynamical mechanism of phase transitions in a-site ferroelectric relaxor (Na1/2Bi1/2)TiO3

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dc.contributor.authorDeng, GCen_AU
dc.contributor.authorDanilkin, SAen_AU
dc.contributor.authorImperia, Pen_AU
dc.contributor.authorLi, Xen_AU
dc.contributor.authorZhao, XBen_AU
dc.contributor.authorLuo, HQen_AU
dc.date.accessioned2022-08-29T05:03:39Zen_AU
dc.date.available2022-08-29T05:03:39Zen_AU
dc.date.issued2016-02-02en_AU
dc.date.statistics2021-09-24en_AU
dc.description.sponsorshipThe dynamical phase transition mechanism of (Na1/2Bi1/2)TiO3 (NBT) was studied using inelastic neutron scattering. Softening of multiple phonon modes were observed to correlate with the phase transition sequence of NBT. As usual, the softening of the zone centre transverse optic (TO) modes Δ5 and Σ3 was observed in (200) and (220) zone, showing the Ti vibration instabilities in TiO6 octahera for both cubic-tetragonal (C-T) and tetragonal-rhombohedral (T-R) phase transitions. In this two phase transitions, however, Ti4+ has different preferential displacement directions. Surprisingly, the longitudinal optic (LO) mode also soften significantly toward zone centre in the vicinity range of the transition temperature, indicating the Na+/Bi3+ vibration instability against TiO6 octahera during the R-T phase transition. Strong inelastic diffuse scattering shows up near M(1.5, 0.5, 0) and R(1.5, 1.5, 0.5) in the tetragonal and rhombohedral phases, respectively, indicating the condensations of the M3 and R25 optic modes for the corresponding phase transitions. This reveals the rotation instabilities of TiO6 in the corresponding phase transition temperature range. Bottleneck or waterfall features were observed in the dispersion curves at certain temperatures, but did not show the close correlations to the formation of polar nanoregions (PNRs). Additional instabilities are the origin of the complexity of phase transitions and crystallographic structures in NBT.en_AU
dc.identifier.citationDeng, G., Danilkin, S., Zhang, H., Imperia, P., Li, X., Zhao, X. & Luo, H. (2016). Dynamical mechanism of phase transitions in a-site ferroelectric relaxor (Na1/2Bi1/2)TiO3. Paper presented to the 40th Annual Condensed Matter and Materials Meeting Charles Sturt University, Wagga Wagga, NSW, 2nd February – 5th February, 2016, (pp. 118). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2016/Wagga_2016_Conference_Handbook.pdfen_AU
dc.identifier.conferenceenddate5 February 2016en_AU
dc.identifier.conferencename40th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate2 February 2016en_AU
dc.identifier.isbn978-0-646-96433-1en_AU
dc.identifier.otherTP10en_AU
dc.identifier.pagination118en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2016/Wagga_2016_Conference_Handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13649en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectPhononsen_AU
dc.subjectVapor condensationen_AU
dc.subjectCrystallographyen_AU
dc.subjectNeutronsen_AU
dc.subjectOptical modesen_AU
dc.subjectTransition temperatureen_AU
dc.titleDynamical mechanism of phase transitions in a-site ferroelectric relaxor (Na1/2Bi1/2)TiO3en_AU
dc.typeConference Posteren_AU
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