Issue 7, 2005
From the journal:

Journal of Materials Chemistry

Temperature-dependent crystal structure of ferroelectric Ba2LaTi2Nb3O15

G. C. Miles,*a   M. C. Stennett,a   I. M. Reaneya  and  A. R. Westa  

* Corresponding authors

a Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, UK

Abstract

The crystal structure of Ba2LaTi2Nb3O15 was determined using high resolution powder neutron diffraction data collected at 100 K and 400 K. Both structures, refined in space groups P4bm (100 K) and P4/mbm (400 K), are closely related tetragonal tungsten bronzes with Ba in large 15-coordinate sites, La in 12-coordinate sites and Nb,Ti disordered over octahedral sites. The structural origin of the low temperature ferroelectricity is attributed primarily, from variation in bond lengths with temperature, to off-centre displacement of Ti/Nb atoms from their octahedral sites. At room temperature, selected area electron diffraction showed a weak superstructure leading to a doubling of a and c but which is incommensurate parallel to [110].

Graphical abstract: Temperature-dependent crystal structure of ferroelectric Ba2LaTi2Nb3O15

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Article information

DOI
https://doi.org/10.1039/B408129N
Article type
Paper
Submitted
28 May 2004
Accepted
19 Oct 2004
First published
08 Dec 2004

J. Mater. Chem., 2005,15, 798-802

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Temperature-dependent crystal structure of ferroelectric Ba2LaTi2Nb3O15

G. C. Miles, M. C. Stennett, I. M. Reaney and A. R. West, J. Mater. Chem., 2005, 15, 798 DOI: 10.1039/B408129N

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