Thermal variation of structure and electrical conductivity in Bi14WO24

Anna Borowska-Centkowska , Franciszek Krok , I. Abrahams , Wojciech Wróbel , J.R. Dygas , S. Hull

Abstract

Structure and electrical conductivity of Bi14WO24 as a function of temperature have been examined by X-ray and neutron powder diffraction, a.c. impedance spectroscopy and differential thermal analysis. The room temperature structure was successfully refined using a monoclinic subcell model in space group I2/m. However, additional reflections in the neutron data are consistent with a large supercell of dimensions a = 17.3780(1) Å, b = 17.3891(1) Å, c = 26.1785(2) Å and β = 90.270(1)°, as previously proposed. Transitions to tetragonal and cubic phases are observed at ca. 35 °C and 780 °C, respectively. The structure of the high temperature polymorph is confirmed as a fully disordered δ-Bi2O3 type phase. Analysis of the defect structure is consistent with a predominantly tetrahedral environment for tungsten, as seen at low temperatures. The conductivity behaviour is correlated with the appearance of the δ-phase at high temperatures and exhibits a value of 0.97 S cm− 1 at 800 °C.
Author Anna Borowska-Centkowska (FP / SSID)
Anna Borowska-Centkowska,,
- Solid State Ionics Division
, Franciszek Krok (FP / SSID)
Franciszek Krok,,
- Solid State Ionics Division
, I. Abrahams - [School of Biological and Chemical Sciences Queen Mary University of London]
I. Abrahams,,
-
-
, Wojciech Wróbel (FP / SSID)
Wojciech Wróbel,,
- Solid State Ionics Division
, J.R. Dygas - [Warsaw University of Technology (PW), MNiSW [80]]
J.R. Dygas,,
-
- Politechnika Warszawska
, S. Hull - [ISIS Facility]
S. Hull,,
-
-
Journal seriesSolid State Ionics, ISSN 0167-2738, (A 35 pkt)
Issue year2011
Vol202
No1
Pages14-21
Keywords in EnglishBismuth oxide, Bismuth tungsten oxide, Defect structure, Fluorite, impedance spectroscopy, Neutron diffraction
ASJC Classification3104 Condensed Matter Physics; 2500 General Materials Science; 1600 General Chemistry
DOIDOI:10.1016/j.ssi.2011.07.022
URL http://www.sciencedirect.com/science/article/pii/S016727381100422X
Score (nominal)35
Score sourcejournalList
Publication indicators WoS Citations = 4; Scopus Citations = 5; GS Citations = 1.0; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 1.615; WoS Impact Factor: 2011 = 2.646 (2) - 2011=3.097 (5)
Citation count*1 (2015-05-11)
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