ePubs

The open archive for STFC research publications

ePubs is undergoing scheduled maintenance on 06/12/2022 between 08:30-09:00 and the service will be unavailable during this time.

Full Record Details

Persistent URL http://purl.org/net/epubs/work/65887
Record Status Checked
Record Id 65887
Title Phase and electrical behaviour in Bi 4 NbO 8.5
Contributors
Abstract A study of phase and electrical behaviour in the bismuth niobate, Bi4NbO8.5, using x-ray and neutron powder diffraction, thermogravimetric analysis (TGA), x-ray photoelectron spectroscopy (XPS) and ac impedance spectroscopy is presented. Two polymorphs were identified in this composition, a tetragonal phase (type III), which can appear at temperatures above 800?°C and a pseudo-cubic phase (type II) evident at lower temperatures. The defect structure analysis of the type II phase is consistent with the existence of chains of niobate polyhedra, which facilitate electronic conduction at low temperatures. The appearance of the type III phase is strongly dependent on experimental conditions and TGA and XPS measurements suggest a likely association with change in oxygen stoichiometry.
Organisation ISIS , ISIS-POLARIS , STFC
Keywords
Funding Information
Related Research Object(s):
Licence Information:
Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article J Phys-Condens Mat 24, no. 4 (2012): 045904. doi:10.1088/0953-8984/24/4/045904 2012