Colorimetry technique on BaTiO3 and KNbO3 ceramics to determine the phase transition |
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| Authors: | Ernesto Suaste-Gomez Omar Teran-Jimenez Hector Reyes-Cruz |
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| Affiliation: | 1. MLS Professor''s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, India;2. Polymer Science Unit, Indian Association for the Cultivation of Science, Kolkata 700032, India;1. Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom;2. Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom;3. Sagentia Ltd., Harston Mill, Harston, Cambridge CB22 7GG, United Kingdom;4. Netherlands Organisation for Scientific Research (NWO), DUBBLE@ESRF, CS40220, 38043 Grenoble Cedex 9, France |
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| Abstract: | In this work, colorimetry was used in order to identify the phase transition of BaTiO3 and KNbO3 ceramic. The transition of the structure produces a change of color of the ceramic bulks because their optical properties change. The transition phase was detected with a color sensor and reflectance method on ceramic bulks. CIE L*a*b* and CIE L*u*v* color spaces were used to measure the color changes reported. Experimental results showed that the changes of color are suitable for detecting the phase transition in both perovskite structures. The phase transition in the proposed ferroelectric materials was also measured by means of the dielectric constant method and the results obtained were in agreement with the temperatures reported for phase transition changes on BaTiO3 and KNbO3. Therefore, the colorimetry technique proposed in this paper proved to be suitable for detecting structure changes as a relationship between color properties and temperature. |
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