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http://ciateq.repositorioinstitucional.mx/jspui/handle/1020/591| Effect of microwave-assisted synthesis and sintering of lead-free KNL-NTS ceramics | |
| DANNY ANGGEL LAGUNAS CHAVARRIA María Guadalupe Navarro Rojero María Dolores Salvador Moya Rut Benavente Jose Manuel Catalá_Civera Amparo Borrell | |
| Acceso Abierto | |
| Atribución-NoComercial-CompartirIgual | |
| https://www.mdpi.com/journal/materials https://www.mdpi.com/1996-1944/15/11/3773 https://www.mdpi.com/1996-1944/15/11/3773 | |
| KNL-NTS ceramics Synthesis Calcination Microwave processing Piezoelectric properties | |
| Lead-free piezoelectric powders (K0.44Na0.52Li0.04)(Nb0.82Ta0.10Sb0.04)O3 were obtained by conventional and microwave-assisted reactive heating. Firstly, the synthesis of the material was carried out following the mixed oxide route and employing both traditional methods and microwave technology. Thermogravimetry, X-ray diffraction, field emission scanning electron microscopy and electrical properties analyses were evaluated. X-ray diffraction of the powders calcined by the microwave process shows the formation of perovskite structure with orthorhombic geometry, but it is possible to observe the presence of other phases. The presence of the secondary phases found can have a great influence on the heating rate during the synthesis on which the kinetics of the reaction of formation of the piezoelectric compound depend. The calcined powder was sintered at different temperatures by conventional and non-conventional processes. The microstructure of the ceramics sintered by microwave at 1050 ◦C for 10 min shows perovskite cubes with regular geometry, of size close to 2–5 µm. However, the observed porosity (~8%), the presence of liquid phase and secondary phases in the microstructure of the microwave sintered materials lead to a decrease of the piezoelectric constant. The highest d33 value of 146 pC/N was obtained for samples obtained by conventional at 1100 ◦C 2 h compared to samples sintered by microwave at 1050 ◦C 10 min (~15 pC/N). This article belongs to the Special Issue Advanced Ceramics and Composites Using Microwave Technology. | |
| MDPI | |
| 2022 | |
| Artículo | |
| Materials, vol. 15, no. 11, art. 3773 (12 pág.) | |
| Inglés | |
| Público en general | |
| OTRAS | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | Artículos Publicados en Revistas Indexadas |
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