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Crystallographic and optical study of LiNb1 − xTaxO3
DOI:
10.1107/S2052520617004711
Authors:
S.
Huband
(University of Warwick)
,
D. S.
Keeble
(University of Warwick; Diamond Light Source)
,
N.
Zhang
(Xi'an Jiaotong University)
,
A. M.
Glazer
(University of Warwick; University of Oxford)
,
A.
Bartasyte
(University of Bourgogne Franche-Comté)
,
P. A.
Thomas
(University of Warwick)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Acta Crystallographica Section B Structural Science, Crystal Engineering And Materials
, VOL 73
, PAGES 498 - 506
State:
Published (Approved)
Published:
June 2017
Abstract: Powders of lithium niobate-tantalate across the full compositional range have been made and crystals grown using a lithium vanadate flux growth technique. The Li-content of a lithium tantalate crystal has been determined using the zero-birefringence temperature and Curie measurements, confirming the Li content is between that of congruent and stoichiometric crystals. X-ray diffraction measurements show the Nb/Ta displacement and octahedral tilt both decrease as the Ta content is increased. This also results in a decrease in the lattice parameters from lithium niobate to lithium tantalate. Birefringence measurements on the crystals as a function of temperature have been used to determine the point that the crystals become zero-birefringent, and by comparison with the structural studies have confirmed that it is not related to a phase transition and the structures remain polar through the zero-birefringence points.
Journal Keywords: lithium niobate tantalate; zero birefringence; metripol
Subject Areas:
Chemistry
Technical Areas:
Added On:
17/07/2017 15:48
Documents:
ayb2bp5094.pdf
Discipline Tags:
Chemistry
Technical Tags: