Piezoelectric and Dielectric Properties of (LiNaK)(NbTaSb)O₃ Ceramics with Variation in Poling Temperature

Abstract

In this study, lead-free (LiNaK)(NbTaSb)O 3 piezoelectric ceramics were fabricated on the basis of the amount of K 2 CO 3 addition, and their piezoelectric and dielectric properties were investigated by varying the amount of K 2 CO 3 addition and poling temperature. First, to achieve optimum poling conditions for manufactured specimens, the poling temperature was varied to be 0, 20, 50, 80, and 110 C. The optimum poling temperature was 20 C. It was found that 0.1 wt % K 2 CO 3 -added (Li 0:04 Na 0:44 K 0:52 ) (Nb 0:86 Ta 0:1 Sb 0:04 )O 3 ceramics exhibit excellent piezoelectric properties in an experiment performed on the basis of the amount of K 2 CO 3 addition. That is, a 0.1 wt % K 2 CO 3 -added specimen showed a large electromechanical coupling factor k p ¼ 0:494, a large piezoelectric constant d 33 ¼ 274 pC/N, and a high density of 4.65 g/cm 3 at the poling temperature of 20 C.

Piezoelectric properties of (Li, Ag, Sb) modified (K0.50Na0.50)NbO3 lead-free ceramics

“…Therefore, it is necessary to search for lead-free piezoelectric ceramics with excellent properties. Recently, much attention for lead-free piezoelectric ceramics has been paid to (K 0.5 Na 0.5 )NbO 3 (KNN)-based ceramics because of its environmental harmony, good electrical properties, and high Curie temperature [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Piezoelectric properties of (Li, Ag) modified (Na0.50K0.50)NbO3 lead-free ceramics with high Curie temperature

“…Moreover, it is also found that the T c shifts upward, and T o-T shifts downward compared to pure KNN materials (T c ∼ 420 • C and T o-T ∼195 • C) owing to the addition of ALN, i.e., the T c shift upward, and T o-T shift to downward with the increase of ALN content. As compared with some KNN-based ceramics reported, it was clear that the results in present work show that the (1 − x)KNNL-xALN (x = 0.01) lead-free piezoelectric ceramics possess higher Curie temperature (T c = 476 • C), which is higher than the reported values of KNN-based ceramics [1][2][3][4][5][6][7][8][9]. In this work, high Curie temperature and good piezoelectric properties of (1 − x)KNNL-xALN ceramics are attributed to Ag and Li cosubstitution.…”

“…Recently, much attention for lead-free piezoelectric ceramics has been paid to (K 0.5 Na 0.5 )NbO 3 (KNN) based piezoelectric ceramics for its good electrical properties and high Curie temperature [4][5][6][7][8][9][10][11][12][13][14][15][16]. But recent research results also reveal that the piezoelectric properties of KNN-based lead-free ceramics could be improved, but the Curie temperature (T c ) of the ceramics usually decreases [4][5][6][7]10,12,13].…”

“…But recent research results also reveal that the piezoelectric properties of KNN-based lead-free ceramics could be improved, but the Curie temperature (T c ) of the ceramics usually decreases [4][5][6][7]10,12,13]. As a result, the goal of this work is to obtain the materials with relative good piezoelectric properties and high Curie temperature.…”

(K,Na)NbO3-based Lead-free Piezoelectric Materials: An Encounter with Scanning Probe Microscopy

“…Inferior ferroelectric response is obtained by insufficient poling, which is caused by various factors such as defects. The effect of poling conditions on the dielectric and piezoelectric properties of KNN-based ceramics has been a subject of recent studies [92][93][94][95][96][97], most of which pointed out that poling temperature is of significant importance for property enhancement. Nevertheless, poling process could also be utilized to manipulate interior dipole movement, which might be tuned to favorable piezoelectric performance [52,53].…”