Phase Structure and Piezoelectric Property of (1-x)K0.48Na0.52NbO3-xBi0.45Nd0.05(Na0.92Li0.08)0.5ZrO3 Lead-free Piezoceramics

doi:10.15541/jim20170144

Abstract

Abstract:

To enhance the piezoelectric properties and maintain relatively higher Curie temperature (T_C), (1-x)K_0.48Na_0.52NbO₃-x Bi_0.45Nd_0.05(Na_0.92Li_0.08)_0.5ZrO₃ ((1-x) KNN-xBNNLZ) ceramics were prepared by conventional solid-state method. The effects of BNNLZ content on the phase structure and electrical properties of the ceramics were investigated in details. The results show that all ceramic samples exhibit higher T_C(>300℃). With the increase of BNNLZ content, both orthorhombic-tetragonal phase transition temperature (T_O-T) and rhombohedral-orthorhombic phase transition temperatures (T_R-O) shift to room temperature simultaneously, and finally the R-T phase coexistence is constructed near room temperature in the compositions range of 0.05<x<0.07. The phase transitions of the ceramics caused by BNNLZ addition lead to values of d₃₃, ε_r, P_r, and k_p increase firstly and then decrease. The ceramic with x=0.06 exhibits optimal properties: d₃₃=313 pC/N, k_p=42%, P_r=25.48 μC/cm², ε_r=1353, tanδ=2.5%, together with a higher T_C of 327℃.

Key words: potassium-sodium niobate (KNN), piezoelectric properties, phase boundary construction

CLC Number:

TM221

ZHAO Lin, MA Jian, ZHANG Jun, WU Bo, XIAO Ding-Quan. Phase Structure and Piezoelectric Property of (1-x)K_0.48Na_0.52NbO₃-xBi_0.45Nd_0.05(Na_0.92Li_0.08)_0.5ZrO₃ Lead-free Piezoceramics[J]. Journal of Inorganic Materials, 2018, 33(1): 87-92.

Figures/Tables 8

Fig. 1 XRD patterns of (1-x) KNN-xBNNLZ ceramics

Fig. 2 SEM images of (1-x) KNN-xBNNLZ ceramics^(a) x=0; (b) x=0.03; (c) x= 0.06; (d) x= 0.07

Fig. 3 Temperature dependence of the dielectric constant (εr) of (1-x) KNN-xBNNLZ ceramics measured at 10 kHz

Fig. 4 Capacitance of (1-x) KNN-xBNNLZ ceramics with different content ^((a) 0.03; (b) 0.05; (c) 0.06; (d) 0.07) from -150-220℃ measured at 100 kHz

Fig. 5 Room temperature value of εr and tanδ of (1-x) KNN- xBNNLZ ceramics measured at 100 kHz

Fig. 6 (a) P-E hysteresis and (b) remnant polarization Pr and coercive field Ec of (1-x) KNN-xBNNLZ ceramics

Fig. 7 (a) Piezoelectric properties and (b) the d33 and εrPr values of (1-x) KNN-xBNNLZ ceramics as a function of x

Fig. 8 Piezoelectric properties of the 0.94KNN-0.06BNNLZ ceramics as a function of annealing temperature

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Phase Structure and Piezoelectric Property of (1-x)K_0.48Na_0.52NbO₃-xBi_0.45Nd_0.05(Na_0.92Li_0.08)_0.5ZrO₃ Lead-free Piezoceramics

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