Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

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 2018 Impact Factor of Chinese Journal of Catalysis is 4.914

“…The Bi@R-TiO2-200 and Bi@R-TiO2-250 show poor light absorption due to the low amount of Bi [29]. The Bi@R-TiO2-300 exhibits the best light absorption, which should be attributed to the suitable loading amount of Bi [30]. However, the Bi@R-TiO2-350 exhibits a relatively poor visible-light absorption compared with Bi@R-TiO2-300 due to the much bigger Bi particles.…”

Emergence of electronic conduction in bismuth oxide eletrolyte under high pressure

“…[1][2][3][4] In Bi 2 O 3 , O 2− is a mobile ion in the rigid lattice of Bi 3+ ions and a high ionic conductivity is desirable for technical applications. [5][6][7] A change in lattice structure is an essential factor that can regulate the electrical transport properties of ionic conductors. [8][9][10][11] Raising temperature is one of the main ways to tune the lattice structure of ionic conductors and then endow the ionic conductors with high conductivity.…”