Effect of calcination rate on mechano-chemically activated powders for the synthesis of lead-free KNN-type ceramics
[EN] Given the raising environmental concerns over lead toxicity, replacing the common leadbased piezoelectric ceramics with a proper alternative became a hot topic. (Na0.5K0.5)NbO3 (KNN) is considered a potential replacement for such ceramics. This work presents the synthesis of KNN-type ceramics b...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/233354 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/233354 |
| Access Level: | acceso abierto |
| Palabra clave: | KNN Piezoelectric ceramics Ball milling Calcination 12.- Garantizar las pautas de consumo y de producción sostenibles 15.- Proteger, restaurar y promover la utilización sostenible de los ecosistemas terrestres, gestionar de manera sostenible los bosques, combatir la desertificación y detener y revertir la degradación de la tierra, y frenar la pérdida de diversidad biológica |
| Sumario: | [EN] Given the raising environmental concerns over lead toxicity, replacing the common leadbased piezoelectric ceramics with a proper alternative became a hot topic. (Na0.5K0.5)NbO3 (KNN) is considered a potential replacement for such ceramics. This work presents the synthesis of KNN-type ceramics based on conventional solid-state reaction, where the effect of precursor particle size is studied. A combined mechanical activation by ball milling and calcination at low temperature of 800 ¿C is applied. The phase structure evolution, morphology and mechanical properties are investigated systematically with the particle size and the calcination rate. The results indicate a marked effect of the precursor particle size on the properties of obtained ceramics. Secondary phase content could be lowered and tetragonality improved by the applied approach. Despite the presence of secondary phases, dielectric measurements indicated typical values of dielectric constant and loss for piezoelectric materials. |
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