Low-Temperature Sintering and Enhanced Piezoelectric Properties in KNN-LTS Nanopowder Prepared via a Low-Cost Water-Based Sol-Gel Method

Abstract:

nanoscale lead-free perovskite powders with a composition of (Na_0.52K_0.4425Li_0.0375)(Nb_0.9125Ta_0.0375Sb_0.05)O₃ (KNN-LTS) have been synthesized via a low-cost water-based sol-gel method, to reduce the sintering temperature and enhance the electrical properties. KNN-LTS nanopowders with average particle size of about 20 nm are obtained by citrate precursor sol-gel process, where Nb (OH)₅ and Sb₂O₃ are used to replace the costly mental alkoxides. The sol-gel derived nanopowders can be densified at lower temperature of 940 °C and exhibited excellent electrical properties after sintering at 1020 °C (d₃₃ = 396 pC/N, k_p = 50.1% = 1882 and tanδ = 0.02), providing a tremendous potential method for high-performance lead-free ceramics preparation.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 795-799
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.795
• Online since: March 2014
• Authors: Yu Huan, Xiao Hui Wang*, Long Tu Li
• Keywords: Enhanced Piezoelectric Properties, Low-Temperature Sintering, Potassium-Sodium Niobate, Water-Based Sol-Gel Method

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