Inelastic neutron scattering from cubic stabilised zirconia

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dc.contributor.authorArgyriou, DNen_AU
dc.contributor.authorElcombe, MMen_AU
dc.date.accessioned2022-11-29T23:27:30Zen_AU
dc.date.available2022-11-29T23:27:30Zen_AU
dc.date.issued1994-02-09en_AU
dc.date.statistics2022-04-07en_AU
dc.description.abstractPhonon dispersion curves have been measured for three cubic stabilised zirconias (CSZ) with varying amounts of oxygen vacancies (Zr(Y)O1.193, Zr(Ca)O1.875, Zr(Y)O1.805), using a triple axis spectrometer. We have been able to observe transverse (TA) and longitudinal acoustic (LA) branches for these crystals. However in agreement with previous work, and despite an exhaustive search in (Q,ω) space, optic modes were not observed 1. The behaviour of the LA and TA branches is atypical, in that phonons become increasingly broader, and weaker close to the Brillouin zone boundary. This is particularly the case for the [ζζ0] direction, where the TA2 branch disappears beyond ζ=0.45. This atypical behaviour has been speculated to be caused by to the defect fluorite structure of CSZ. Recently a reliable model of the static structure has been determined 2 and has been used here to explain the observed inelastic neutron scattering observations. To understand the effect of the defect structure of CSZ to the observed neutron measurements, lattice dynamical calculations have been carried out on the basis of the static structure. These calculations show that the stability of CSZ is particular sensitive to the [100] interactions between oxygen atoms. They show that either relatively small variations in the force constants for this interaction, associated with variations of the 0-0 bondlengths in the defect structure, or the incorporation of vacancies into the structure can render the [(ζζ0] TA2 mode mutable. This is in agreement with the experimental results which shows that this mode disappears rapidly. These calculations also show a general broadening of all phonon branches. This makes the measurer lent of the optic phonon particularly difficult. It is found therefore that the static defect model of CSZ is consistent with the inelastic neutron scattering measurements.en_AU
dc.identifier.citationArgyriou, D. N., Elcombe, M. M. (1994). Inelastic neutron scattering from cubic stabilised zirconia. Poster presented to the 18th Annual Condensed Matter Physics Meeting, Charles Sturt University, Wagga Wagga, NSW, 9-11 February 1994.en_AU
dc.identifier.conferenceenddate11 February 1994en_AU
dc.identifier.conferencename18th Annual Condensed Matter Physics Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate9 February 1994en_AU
dc.identifier.otherTP28en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14120en_AU
dc.language.isoenen_AU
dc.publisherAustralian and New Zealand Institutes of Physicsen_AU
dc.subjectAlkaline earth metal compoundsen_AU
dc.subjectChalcogenidesen_AU
dc.subjectCrystal latticesen_AU
dc.subjectDiffractionen_AU
dc.subjectMathematical modelsen_AU
dc.subjectNonmetalsen_AU
dc.subjectOxygen compoundsen_AU
dc.subjectQuasi particlesen_AU
dc.subjectScatteringen_AU
dc.subjectTransition element compoundsen_AU
dc.titleInelastic neutron scattering from cubic stabilised zirconiaen_AU
dc.typeConference Posteren_AU
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