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- Title
Correlation of Electrical Response and Structural Phase Transitions in Bi<sub>2</sub>O<sub>3</sub> Nanowires.
- Authors
Vila, María; Rivera‐Calzada, Alberto; Salas‐Colera, Eduardo; Castro, Germán R.; Díaz‐Guerra, Carlos
- Abstract
The electric response of Bi2O3 nanowires is studied by means of impedance spectroscopy at high temperatures and compared to a reference bulk Bi2O3 ceramic. Nanowires present the α to δ phase transition at a similar temperature than the ceramic (1007 vs. 1010 K), showing an increase of over two orders of magnitude in the conductance. On cooling, nanowires change directly to the α phase instead of presenting metastable phases, like the bulk sample. Both samples present a dominant ionic contribution in the δ phase which is also present in the α phase at the highest temperatures. X‐ray absorption spectroscopy (XAS) measurements reveal no differences in the short range structural order of both kinds of samples at room temperature, while a detailed analysis by high temperature X‐ray diffraction (HTXRD) confirms the transitions observed in the conductance measurements. The authors relate the direct phase transition δ → α in nanowires to a lower thermal conductivity in these nanostructures. The ionic transport properties of Bi2O3 nanowires and ceramics as a function of temperature are investigated and correlated with a structural study of the samples. An α → δ phase transition is observed in both materials, but a direct δ → α transition, without the formation of metastable phases, is observed on cooling the nanowires, probably due to their lower thermal conductivity.
- Subjects
X-ray absorption spectra; X-ray diffraction; STATISTICAL correlation; ELECTRIC properties of nanowires; ELECTRIC admittance
- Publication
Physica Status Solidi. A: Applications & Materials Science, 2018, Vol 215, Issue 19, pN.PAG
- ISSN
1862-6300
- Publication type
Article
- DOI
10.1002/pssa.201800186