The open archive for STFC research publications

Full Record Details

Persistent URL http://purl.org/net/epubs/work/45305446
Record Status Checked
Record Id 45305446
Title Evolution of structure in the incommensurate modulated LaNb1-xWxO4+x/2 (x = 0.04–0.16) oxide ion conductors
Abstract Hyper-stoichiometric CeNbO4+d phases demonstrate remarkable oxygen diffusivity and provide an interesting structural template for oxygen ion conductors. Previously, we have reported the room temperature structure of the incommensurate modulated LaNb0.88W0.12O4+d, a structural analogue of CeNbO4+d, and suggested that it is a pure oxygen ion conductor, the anions moving via an interstitialcy mechanism. However, the high temperature structural information for the LaNb1-xWxO4+d (x = 0.04–0.16) family, which is key to understanding the structure-property relationship in oxygen ionic conductors with complex structures at operating conditions, is unreported. In this contribution, we address this question by investigating the high temperature structural evolution of the LaNb1-xWxO4+d phases using a combination of thermal analysis, scattering techniques and 17O and 93Nb nuclear magnetic resonance spectroscopy. We reveal a series of phase transitions between a modulated monoclinic phase, a high temperature unmodulated tetragonal phase and a high temperature modulated tetragonal phase. These findings are correlated with the ion transport and offer insights into the design of new materials for solid state electrochemical devices.
Organisation ISIS , ISIS-HRPD , STFC
Funding Information
Related Research Object(s): 10.5286/ISIS.E.55377197
Licence Information:
Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Chem Mater 32, no. 6 (2020): 2292-2303. doi:10.1021/acs.chemmater.9b04255 2020