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338592 
Journal Article 
Enhancing Electrical Properties in NBT-KBT Lead-Free Piezoelectric Ceramics by Optimizing Sintering Temperature 
Zhang, YR; Li, JF; Zhang, BP 
2008 
Yes 
Journal of the American Ceramic Society
ISSN: 0002-7820 
91 
8 
2716-2719 
Conventional sintering of (Na[sup]1-x[/sup]K[sup]x[/sup])[sup]0.5[/sup]Bio[sup]0.5[/sup]TiO[sup]3[/sup] (abbreviated as NKBTx, x = 18-22 mol%) lead-free piezoelectric ceramics was investigated to clarify the optimal sintering temperature for densification and electrical properties. Both sintered density and electrical properties were sensitive to sintering temperature; particularly, the piezoelectric properties deteriorated when the ceramics were sintered above the optimum temperature. The NKBT20 and NKBT22 ceramics synthesized at 1110°-1170°C showed a phase transition from tetragonal to rhombohedral symmetry, which was similar to the morphotropic phase boundary (MPB). Because of such MPB-like behavior, the highest piezoelectric constant (d[sup]33[/sup]) of about 192 pC/N with a high electromechanical coupling factor (k[sup]P[/sup]) of about 32% were obtained in the NKBT22 ceramics sintered at 1150°C. (English) 
Propriété ferroélectrique; Propriété piézoélectrique; Microstructure; Microscopie électronique balayage; Diffraction RX; Propriété électrique; Relation fabrication propriété; Densification; Optimisation; Frittage; Fabrication; Solution solide; Bismuth Potassium Sodium Titanate Mixte; Potassium Titanate; Bismuth Titanate; Sodium Titanate; Titanate; Céramique piézoélectrique; Céramique électronique; Céramique oxyde; Etude expérimentale; Céramique sans plomb; (Na1-xKx)0,5Bi0,5TiO3; Ferroelectric properties; Piezoelectric properties; Scanning electron microscopy; X ray diffraction; Electrical properties; Fabrication property relation; Optimization; Sintering; Manufacturing; Solid solution; Bismuth Potassium Sodium Titanates Mixed; Potassium Titanates; Bismuth Titanates; Sodium Titanates; Titanates; Piezoelectric ceramics; Electroceramics; Oxide ceramics; Experimental study; Lead-free ceramic materials; Propiedad ferroeléctrica; Propiedad piezoeléctrica; Microestructura; Microscopía electrónica barrido; Difracción RX; Propiedad eléctrica; Relación fabricación propiedad; Densificación; Optimización; Sinterización; Fabricación; Solución sólida; Bismuto Potasio Sodio Titanato Mixto; Potasio Titanato; Bismuto Titanato; Sodio Titanato; Titanato; Cerámica piezoeléctrica; Cerámica electrónica; Cerámica óxido; Estudio experimental