Effect of Sintering Temperature on the Structure and Piezoelectric Properties of Lead-Free 0.97K_0.5Na_0.5NbO₃-0.03AlFeO₃ Ceramics

Abstract:

Lead-free piezoelectric 0.97 K_0.5Na_0.5NbO₃-0.03 AlFeO₃ (KNN-AF) ceramics were prepared at low temperature of 980 °C to 1020 °C by the conventional ceramic process. The effect of sintering temperature on the crystal structure, density and electrical properties of the ceramics was investigated. The results indicate that KNN-AF ceramics sintered at an low temperature of 1000 °C exhibit high electrical and piezoelectric properties, with piezoelectric constant d₃₃=116ρC/N, and electromechanical coupling factor k_p = 32.9%, polarization (P_r) was P_r =21.8 μC/cm² and curie temperature T_C=382°C. This also indicates that KNN-AF ceramics are promising candidate materials for lead-free piezoelectric applications.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 822-825
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.822
• Online since: March 2014
• Authors: Ling Peng, Min Hong Jiang*, Zheng Fei Gu, Gang Cheng
• Keywords: AlFeO₃, Curie Temperature, Lead-Free Ceramics, Low-Temperature Sintering, Piezoelectric Properties

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