Dielectric and Piezoelectric Characteristics in Lead-Free Lix(K0.5Na0.5)1-x(Nb0.8Ta0.2)O3 Piezoelectric Ceramics Prepared by Two-Step Calcination Method
| Autor: | Shu-Hua Liang, Chin-Hsiung Liao, Chien-Min Cheng, Jen-Hwan Tsai, Kai-Huang Chen |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Japanese Journal of Applied Physics. 51:09MD11 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.1143/jjap.51.09md11 |
| Popis: | Lead-free Li x (K0.5Na0.5)1-x (Nb0.8Ta0.2)O3 piezoelectric ceramics samples prepared by the conventional solid-state reaction and two-step calcination method were achieved and compared. The effects of the amount of Li2O3 on the phase structure, microstructure, dielectric, and piezoelectric properties of Li x (K0.5Na0.5)1-x (Nb0.8Ta0.2)O3 ceramics samples were systematically discussed and investigated. It was found that the Li2O3 content in Li x (K0.5Na0.5)1-x (Nb0.8Ta0.2)O3 ceramics samples strongly affects the structure and electrical properties. For the two-step calcination method, the lead-free ceramics samples exhibited excellent dielectric and piezoelectric properties. The relative dielectric constant (εr) and loss tangent (tan δ) of the lead-free Li x (K0.5Na0.5)1-x (Nb0.8Ta0.2)O3 piezoelectric ceramics samples for x = 0.03 compositions prepared by the two-step calcination method were 1223 and 0.021, respectively. In addition, the electromechanical coupling factor (k p) and Curie temperature (T C) were 48.5% and 315 °C, respectively. These results show that Li x (K0.5Na0.5)1-x (Nb0.8Ta0.2)O3 ceramics samples are promising candidates for lead-free piezoelectric materials. |
| Databáze: | OpenAIRE |
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