Indirect Determination of the Piezospectroscopic Coefficients of Ceria-Stabilized Tetragonal Zirconia Polycrystals |
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Authors: | Henryk Tomaszewski Jan Strzeszewski Lech Adamowicz Valter Sergo |
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Affiliation: | Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw, Poland;Institute of Physics, Warsaw University of Technology, Koszykowa 5, 00-662 Warsaw, Poland;Dipartimento di Ingegneria dei Materiali e Chimica Applicata, University of Trieste, I-34127 Trieste, Italy |
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Abstract: | A method is proposed for the indirect determination of the stress dependence (expressed as piezospectroscopic (PS) coefficients) of spectroscopic bands of ceramic materials/phases. This method is based on the intimate mixture (intimate at the microstructural, grain-size level) of two phases/materials when the stress in one is independently known; it is used to determine the PS coefficients of the most intense Raman bands in ceria-stabilized tetragonal zirconia polycrystals (Ce-TZP). Different amounts of Ce-TZP were mixed with alumina and the composite pellets sintered; subsequently, the stress in alumina was determined through the PS coefficient of its R2 luminescence band and the stress in Ce-TZP derived from the static equilibrium condition. The frequency shifts of each Raman band of Ce-TZP have been plotted against the stress and the slopes provide the PS coefficients. The method has the advantage of not requiring any type of loading device (i.e., diamond anvil-cell, bending jig). Finally, the limits are also discussed, the most important one being the requirement of immiscibility of the two materials/phases. |
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Keywords: | zirconia: tetragonal piezoelectric properties stress |
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