Neutron powder diffraction study of the zero birefringence points in congruent and stoichiometric lithium tantalate
The birefringence of lithium tantalate varies as a function of lithium content and temperature, resulting in a range of temperatures at which lithium tantalate becomes zero birefringent. We would like to investigate the precise structural changes across this zero birefringence point as a function of temperature for 7Li-enriched congruent lithium tantalate and stoichiometric lithium tantalate. By using neutron diffraction, the position of lithium in the structure, and critically, how this position changes across the zero-birefringence point, will be observed for the first time. These measurements will aid in understanding how lithium tantalate can be simultaneously electrically polar and optically isotropic.
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THOMAS Pamela A.; HUBAND Steven; KEEBLE Dean and SUARD Emmanuelle. (2012). Neutron powder diffraction study of the zero birefringence points in congruent and stoichiometric lithium tantalate. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-506
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