Disorder and phase transitions in oxyfluoride (NH sub(4)) sub(3)Ta(O sub(2)) sub(2)F sub(4)

Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH sub(4)) sub(3)Ta(O sub(2)) sub(2)F sub(4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with re...

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Bibliographic Details
Published in:Journal of fluorine chemistry 2011-10, Vol.132 (10), p.713-718
Main Authors: Flerov, IN, Gorev, M V, Fokina, V D, Bovina, A F, Bogdanov, E V, Pogoreltsev, E I, Laptash, N M
Format: Article
Language:English
Subjects:
Disorders
Distortion
Niobates
Oxyfluorides
Phase transformations
Physical properties
Polyhedrons
X-rays
Online Access:Get full text
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Summary:Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH sub(4)) sub(3)Ta(O sub(2)) sub(2)F sub(4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with related niobate has revealed the important role of the central atom in the physical properties behavior, mechanism of structural distortions and barocaloric effect in oxyfluorides with the eight-coordinated anionic polyhedra.)
ISSN:0022-1139
DOI:10.1016/j.jfluchem.2011.05.012