Video/animation icon  Anisotropic dielectric permittivity: tetragonal-cubic phase transition in barium titanate

 
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Description: A thin section of barium titanate is viewed between crossed-polars, Initially, the sample is below the transition temperature, and since the domains of the anisotropic tetragonal phase exhibit birefringence, it is brightly coloured when viewed between crossed-polars. When the sample reaches the transition temperature, the isotropic cubic phase forms, which appears black. From TLP: Introduction to Anisotropy, http://www.msm.cam.ac.uk/doitpoms/tlplib/anisotropy/dielectric.php
Keywords: anisotropy • phase transition • perovskite • barium titanate
Categories: Science approaches
Science approaches > Phase transformations
Properties > Electrical, magnetic & optical > Conductivity
Testing, analysis & experimentation
Created by: DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 02 August 2006
Date added: 02 December 2009
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Resource ID: 2301