Structural properties of the Nb-doped bismuth oxide materials, Bi1-xNbxO1.5+x

Simple item page
dc.contributor.authorTate, MLen_AU
dc.contributor.authorHack, Jen_AU
dc.contributor.authorKuang, XJen_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorWithers, RLen_AU
dc.contributor.authorJohnson, MRen_AU
dc.contributor.authorEvans, IRen_AU
dc.date.accessioned2021-08-12T23:58:27Zen_AU
dc.date.available2021-08-12T23:58:27Zen_AU
dc.date.issued2015-02-03en_AU
dc.date.statistics2015-08-12en_AU
dc.description.abstractBismuth oxide (Bi2O3) exists in five polymorphs, and possesses excellent oxide ion conductivity when in the cubic fluorite structure type, due to its intrinsic oxide ion vacancies. However, this cubic structure is only stable over a small high-temperature range. Introducing niobium into the bismuth oxide structure stabilises the highly conductive cubic and tetragonal phases to room temperature, allowing for high oxide ion conductivity at lower temperatures. In addition to stabilising the high temperature structure types, doping with niobium also introduces interstitial oxygen atoms into the material in order to maintain a charge balance. Niobium-doped bismuth oxide samples, Bi1-xNbxO1.5+x (x = 0.0625, 0.12), were synthesised by a solid state synthetic method, before undergoing AC impedance spectroscopy experiments to study their electrical properties. Both samples showed excellent oxide ion conductivities, with the cubic sample (x = 0.12) possessing higher conductivity values than the tetragonal sample (x = 0.0625). The tetragonal sample does not exhibit a loss in conductivity on thermal cycling, unlike the cubic sample, where the conductivity decreases due to a phase transformation from the cubic to the tetragonal phase. Variable temperature X-ray powder diffraction elucidated the structural transformations which the tetragonal bismuth niobate undergoes; from being tetragonal at room temperature, to cubic above 680 °C, then returning to the tetragonal phase upon cooling. To locate the interstitial oxygen atom positions in the tetragonal phase, powder neutron diffraction has been undertaken.en_AU
dc.identifier.citationTate, M. L. Hack, J., Kuang, X., McIntrye, G. J., Withers, R. L., Johnson, M . R., & Evans, I. R. (2015). Structural properties of the Nb-doped bismuth oxide materials, Bi1-xNbxO1.5+x. Paper presented at the 39th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 3 February 2015 - 6 February 2015, (pp. 58). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2015/Wagga2015_10_Handbook.pdfen_AU
dc.identifier.conferenceenddate6 February 2015en_AU
dc.identifier.conferencename39th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate3 February 2015en_AU
dc.identifier.isbnISBN:978-0-646-96433-1en_AU
dc.identifier.pagination58en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2015/Wagga2015_10_Handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11344en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectBismuth oxidesen_AU
dc.subjectCrystal dopingen_AU
dc.subjectElectric impedanceen_AU
dc.subjectElectric propertiesen_AU
dc.subjectIonic conductivityen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectNiobiumen_AU
dc.subjectTemperature dependenceen_AU
dc.subjectX-ray diffractionen_AU
dc.titleStructural properties of the Nb-doped bismuth oxide materials, Bi1-xNbxO1.5+xen_AU
dc.typeConference Abstracten_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Wagga2015_10_Handbook(1).pdf
Size:
38.6 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications