Effects of chemical additives on high-field electromechanical properties of PMN–PT–BT ceramics |
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Authors: | Yong S Cho Chang H Yoon Steven M Pilgrim |
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Affiliation: | aSchool of Advanced Materials Engineering, Yonsei University, 134 Shinchon-Dong, Seoul 120-749, South Korea bNew York State College of Ceramics at Alfred University, Alfred, NY 14802, USA |
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Abstract: | A chemical additive method using sol–gel reactions was used to modify the composition and resultant properties of a commercially available 0.96(0.91Pb(Mg1/3Nb2/3)O3–0.09PbTiO3)–0.04 BaTiO3 (PMN–PT–BT) ceramic. Without an additional ball-mixing process, several combinations of minor additives such as Fe, Ba, Sr, Zn, and Ti were incorporated by the chemical method. Weak- and high-field characteristics including dielectric properties, induced strain and polarization, and associated hystereses were evaluated for the samples sintered at 1200 °C for 4 h. All properties were found to depend on the chemical additives and temperature. Especially, the temperature dependence of high-field characteristics revealed different behavior from that reported for conventionally prepared samples. For example, the samples containing 0.5 wt.% SrO, 0.5 wt.% ZnO, and 0.5 wt.% TiO2 did not exhibit a transition to piezoelectric behavior at the temperature expected from the dielectric measurements. Overall, the coating process has been successfully used to modify, and in some cases, enhance the high-field characteristics of PMN-based ceramics for electromechanical uses. |
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Keywords: | A Sol–gel processes C Dielectric properties D Niobates E Actuators |
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