Dielectric and piezoelectric properties of (K0.5Na0.5)(Nb0.97Sb0.03)O3 ceramics according to the K2CuNb8O23 addition

In this study, (K
_0.5
N
_0.5
)
_0.97
(Nb
_0.97
Sb
_0.03
)O
₃
+0.9 mol% K
_5.4
Cu
_1.3
Ta
₁₀
O
₂₉
+ x mol% K
₂
CuNb
₈
O
₂₃
(x = 0, 0.2, 0.6, 0.8) ceramics were prepared by a conventional mixed oxide method and their microstructure and electric properties were investigated. Secondary phase such as K
₆
Ta
_10.8
O
₃₀
was made by the virtue of K
₂
CuNb
₈
O
₂₃
addition in the (K
_0.5
N
_0.5
)
_0.97
(Nb
_0.97
Sb
_0.03
)O
₃
system ceramics. However, the sinterability of the ceramics increased with increasing K
₂
CuNb
₈
O
₂₃
content. At the 0.6mol% K
₂
CuNb
₈
O
₂₃
added composition ceramics sintered at 1060°C, kp and d
₃₃
showed the optimum values of 0.39 and 145[pC/N, respectively, suitable for piezoelectric actuator application.