Synthesis and Dielectric Properties of [(K_0.5Na_0.5)_0.935Li_0.065]NbO₃ Added with Mn for Piezoelectric Ceramic

Abstract:

[(K_0.5Na_0.5 )_0.935Li_0.065]NbO₃–Mn ceramics (Mn = 0, 1.50 and 3 mol %) (KNNL–Mn) were synthesized and measured dielectric properties. Which the K₂CO₃, Na₂CO₃, Li₂CO₃, Nb₂O₅ and MnO₂ (0, 1.5, 3 mol%) were mixed by ball milling method and calcined powders at 1,073 K for 4 h and the sintered at 1,343 K for 2 h in air. The crystal structure was analyzed by XRD technique, the crystallite size was identified by Scherrer’s equation and calculated the theoretical density. It was found that, the XRD patterns of the KNNL–Mn ceramics added with Mn contents was indicated the tetragonal structure and. the crystallite size of Mn = 0, 1.50 and 3 mol% about 32 nm, 34 nm and 57 nm, respectively. The physical properties of the KNNL–Mn ceramics was found that the maximum theoretical density of 90.79 % for Mn = 1.50 mol%. The dielectric constant was found to be maximum of 909.77 and dielectric loss of 0.48 for Mn = 3 mol%.

• Periodical: Key Engineering Materials (Volumes 675-676)
• Pages: 635-638
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.675-676.635
• Online since: January 2016
• Authors: Jukkrit Kongphimai, Hassakorn Wattanasarn, Tosawat Seetawan*
• Keywords: Crystal Structure, Dielectric Constant, Dielectric Loss, Piezoelectric Ceramics

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