Woodward, David I., Lees, Martin R. and Thomas, Pam A. (2012) Structural phase transitions in the Ag2Nb4O11 – Na2Nb4O11 solid solution. Journal of Solid State Chemistry, Vol.192 . pp. 385-389.

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Abstract

The phase transitions between various structural modifications of the natrotantite-structured system xAg2Nb4O11 – (1-x)Na2Nb4O11 have been investigated and a phase diagram constructed as a function of temperature and composition. This shows three separate phase transition types: (1) paraelectric – ferroelectric, (2) rhombohedral – monoclinic and (3) a phase transition within the ferroelectric rhombohedral zone between space groups R3c and R3. The parent structure for the entire series has space group R-3c. Compositions with x > 0.75 are rhombohedral at all temperatures whereas compositions with x < 0.75 are all monoclinic at room temperature and below. At x = 0.75, rhombohedral and monoclinic phases coexist with the phase boundary below room temperature being virtually temperature-independent. The ferroelectric phase boundary extends into the monoclinic phase field. No evidence was found for the R3–R3c phase boundary extending into the monoclinic phase field and it is concluded that a triple point is formed.

Item Type:	Submitted Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Phase transformations (Statistical physics), Ferroelectricity, Tantalum, Sodium compounds, Oxygen compounds
Journal or Publication Title:	Journal of Solid State Chemistry
Publisher:	Elsevier
Date:	August 2012
Volume:	Vol.192
Number of Pages:	5
Page Range:	pp. 385-389
Identification Number:	10.1016/j.jssc.2012.04.014
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Advantage West Midlands (AWM), European Regional Development Fund (ERDF), Birmingham Science City
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URI:	http://wrap.warwick.ac.uk/id/eprint/50169

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