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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: 11th International Conference And Exhibition Of The European Ceramic Society 2009 Título del capítulo: Synthesis of potassium-sodium niobate in solid solution with Li+ and Ta+5Synthesis of potassium-sodium niobate in solid solution with Li+ and Ta+5
The synthesis of lead-free piezoelectric materials with compositions K0.5Na0.5NbO3 and (K0.48Na0.52)0.96Li0.04Nb0.85Ta0.15O3 has been achieved through the spray drying method. During the synthesis niobium and tantalum were complexed with citric acid, and alkaline elements were added as carbonates and then the precursor solution was dried. The crystallization of the compounds was obtained after calcination of as prepared amorphous powders at 800°C for 1 h. The particle size of crystallized powders is smaller than 0.5mm and its was observed that Li+ and Ta+5 affect particle size as compared with pure KNN. It is important to emphasize that this work uses a new approach for the synthesis of lead-free piezoelectric ceramics in the context of an increasing importance for the replacement of PZT materials due to the large amount of toxic lead involved. It was found that the spray drying method could reduce the calcination time which can avoid the high loss of alkaline metals producing ceramics powders with better stoichiometry.
