Abstract
In this paper, (Na,K)1−xLi.x(Nb,Sb)O3–(Bi,Na)(Sr)ZrO3–BaZrO3 ceramics were fabricated with x(= Li) substitution by two-step sintering method, and their physical characteristics were investigated. When Li substitution was added to the ceramics, piezoelectric constant (d33) and electromechanical coupling factor (kp) were rapidly reduced. However, mechanical quality factor (Qm) was enhanced. For the KNN-BNZ((K,Na)(Nb)O3–(Bi,Na)(Sr)ZrO3) ceramics with Li(x) = 0 substitution, the best physical properties of d33 = 300 [pC/N], kp = 0.40, Qm = 33 and dialectic constant (εr) = 2430 were shown, respectively. Additionally, the KNN-BNZ ceramics with Li(x) = 0.02, the d33 of 246[pC/N], the kp of 0.37, the Qm of 42 and the εr of 2090 appeared, which were suitable for the low-loss piezoelectric actuator.
Highlights
Lead zirconate titanate ceramics are widely used in ultrasonic surgery instruments, piezoelectric transformers, piezoelectric speakers and ultrasonic sensors [1,2]
Because the composition ceramics involve more than 60 wt % PbO, when they are sintered at temperatures above 1200 ◦ C, the PbO
It is not very easy to manufacture KNN(K,Na)(Nb)O3 ceramics with the excellent piezoelectric properties owing to the volatilization of alkali lements such as Na and K
Summary
Lead zirconate titanate ceramics are widely used in ultrasonic surgery instruments, piezoelectric transformers, piezoelectric speakers and ultrasonic sensors [1,2]. Juhyun Yoo et al [12] have reported composition ceramics with an excellent piezoelectric constant (d33 ) of ~269 (pC/N) and a high Curie temperature (Tc) of ~275 (◦ C) in the (Bi,Na)ZrO3 -substituted NKN ceramics with rhombohedral-tetragonal (R-T) phase boundary regions. PZT system ceramics show excellent piezoelectric properties in R-T phase regions [13,14]. We added (Bi0.5 Na0.5 )ZrO3 and BaZrO3 to NKN system ceramics in order to form these R-T phase regions. (Bi0.5 Na0.5 )ZrO3 and BaZrO3 can increase rhombohedral-orthorhombic transition temperature (TR-O ) and decrease orthorhombic–tetragonal transition temperature (TO-T ) of (Na,K)NbO3 ceramics near room temperature We added (Bi0.5 Na0.5 )ZrO3 and BaZrO3 to NKN system ceramics in order to form these R-T phase regions. (Bi0.5 Na0.5 )ZrO3 and BaZrO3 can increase rhombohedral-orthorhombic transition temperature (TR-O ) and decrease orthorhombic–tetragonal transition temperature (TO-T ) of (Na,K)NbO3 ceramics near room temperature
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