TY - JOUR
T1 - Enhanced dielectric and piezoelectric properties in Li/Sb-modified (Na, K)NbO 3 ceramics by optimizing sintering temperature
AU - Zhao, Yongjie
AU - Huang, Rongxia
AU - Liu, Rongzheng
AU - Wang, Xilin
AU - Zhou, Heping
PY - 2013/1
Y1 - 2013/1
N2 - In this paper, lead-free (Na 0.474K 0.474Li 0.052)(Nb 0.948Sb 0.052)O 3 ceramics were synthesized by a conventional solid-state reaction route. The effects of sintering temperature on the crystal structure, microstructure, densification, dielectric properties, and ferroelectric properties of the KNNLS ceramics were addressed. X-ray diffraction patterns and Raman spectrum indicated a transition from orthorhombic to tetragonal phase during the sintering temperature region. This transition is attributed to the migration of Li between the matrix grain and grain boundary. Scanning electron microscopy study revealed increased grain size and enhanced densification with increasing sintering temperature. The density of the ceramics sintered at 1080 °C reached a maximum value of 4.22 g/cm 3. KNNLS ceramics sintered at an optimum temperature of 1080 °C exhibited high piezoelectric properties, that is 242 pC/N for d 33, 0.42 for k p and 18.2 μC/cm 2 for P r.
AB - In this paper, lead-free (Na 0.474K 0.474Li 0.052)(Nb 0.948Sb 0.052)O 3 ceramics were synthesized by a conventional solid-state reaction route. The effects of sintering temperature on the crystal structure, microstructure, densification, dielectric properties, and ferroelectric properties of the KNNLS ceramics were addressed. X-ray diffraction patterns and Raman spectrum indicated a transition from orthorhombic to tetragonal phase during the sintering temperature region. This transition is attributed to the migration of Li between the matrix grain and grain boundary. Scanning electron microscopy study revealed increased grain size and enhanced densification with increasing sintering temperature. The density of the ceramics sintered at 1080 °C reached a maximum value of 4.22 g/cm 3. KNNLS ceramics sintered at an optimum temperature of 1080 °C exhibited high piezoelectric properties, that is 242 pC/N for d 33, 0.42 for k p and 18.2 μC/cm 2 for P r.
KW - A. Ceramics
KW - B. Chemical synthesis
KW - B. X-ray diffraction
KW - D. Piezoelectricity
UR - http://www.scopus.com/inward/record.url?scp=84869097137&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2012.06.043
DO - 10.1016/j.ceramint.2012.06.043
M3 - Article
AN - SCOPUS:84869097137
SN - 0272-8842
VL - 39
SP - 425
EP - 429
JO - Ceramics International
JF - Ceramics International
IS - 1
ER -