Structure and oxide ion conductivity in tetragonal tungsten bronze BaBiNb5O15Electronic supplementary information (ESI) available: Structure model of TTB, SEM micrograph of BBN, complex impedance plots of BBN measured in different atmospheres, XRD patterns of BBN at different temperatures, XRD patterns of BBN, SBN, and BBNT samples, cell parameters of BBN and SBN versus temperature, Rietveld pattern of BBNT, selected bond lengths of BBN. Complex impedance plots at 250 °C and 400 °C and for YSZ-c

• Main Authors: Ma, Hongqiang, Lin, Kun, Fan, Longlong, Rong, Yangchun, Chen, Jun, Deng, Jinxia, Liu, Laijun, Kawaguchi, Shogo, Kato, Kenichi, Xing, Xianran
• Format: Journal Article
• Language: English
• Published: 24.08.2015
• ISSN: 2046-2069
• DOI: 10.1039/c5ra10635d

The crystal structure and electrical properties of a tetragonal tungsten bronze (TTB) compound, BaBiNb 5 O 15 , were investigated by high-resolution synchrotron X-ray powder diffraction and AC impedance spectroscopy. The compound is a new type of oxide ion conductor with a total electrical conductivity of 3 × 10 −4 S cm −1 at 600 °C and a relatively small activation energy (0.3-0.5 eV). It is suggested that the large amount of cationic vacancies in the A sites, the large free space created by the large Ba 2+ cations, and the splits of the Bi atoms are in favor of oxygen ion migration. This stable tungsten bronze compound BaBiNb 5 O 15 with moderate oxide ion conductivity shows potential for applications in SOFC anodes, amperometric gas sensors, and active catalyst supports. Tetragonal tungsten bronze compound, BaBiNb 5 O 15 , is found to be a new type of oxide ion conductor with a total electrical conductivity of 3 × 10 −4 S cm −1 at 600 °C.