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Structural phase transitions in the Ag2Nb4O11 – Na2Nb4O11 solid solution
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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. doi:10.1016/j.jssc.2012.04.014 ISSN 0022-4596.
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Official URL: http://dx.doi.org/10.1016/j.jssc.2012.04.014
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 . 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: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > 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: | Academic Press | ||||
ISSN: | 0022-4596 | ||||
Official Date: | August 2012 | ||||
Dates: |
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Volume: | Vol.192 | ||||
Number of Pages: | 5 | ||||
Page Range: | pp. 385-389 | ||||
DOI: | 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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