Piezoelectric Property of PZT-based Relaxor-ferroelectric Ceramics Enhanced by Sm Doping

doi:10.15541/jim20210146

Abstract

Abstract:

Lead zirconate titanate (PZT)-based piezoelectric ceramics are a type of functional material with a wide range of applications, which can be used in ultrasound transducers, piezomotor, medical ultrasound transducer, and surface acoustic wave filter, etc. Improving the piezoelectric property of PZT-based piezoelectric ceramics through modification has always been a research hotspot in this field. In this work, Sm-0.25PMN-0.75PZT piezoelectric ceramics near the morphotropic phase boundary (MPB) were fabricated by conventional solid-phase reaction method, and its microstructure and macroscopic property were systematically studied. The research results show that introduction of Sm³⁺ can enhance the local structural heterogeneity of piezoelectric ceramics, accelerate the dielectric response, and improve the piezoelectric performance. When Sm³⁺ is excessively introduced, the long- range continuity of ferroelectric polarization is interrupted in a large area while the piezoelectric performance decreases. The performance of the optimal composition piezoelectric ceramic obtained in this experiment is: high voltage electric coefficient (d₃₃~824 pC/N), high voltage electric voltage constant (g₃₃~27.1×10^-3 m²/C), and relatively high Curie temperature (T_C~178 ℃). The electrostrain is less than 5% in the range of room temperature to 150 ℃, with relatively good temperature stability. Therefore, this PET-based relaxor-ferrelectric ceramic is a high- performance piezoelectric material with great application prospects.

Key words: PZT, local structure heterogeneity, morphotropic phase boundary (MPB), high piezoelectric coefficient

CLC Number:

TQ174

DONG Chang, LIANG Ruihong, ZHOU Zhiyong, DONG Xianlin. Piezoelectric Property of PZT-based Relaxor-ferroelectric Ceramics Enhanced by Sm Doping[J]. Journal of Inorganic Materials, 2021, 36(12): 1270-1276.

Figures/Tables 9

Fig. 1 Surface and cross sectional SEM images and grain size distributions of ySm-0.25PMN-0.75PZT ceramics (a) y=0; (b) y=0.4%; (c) y=0.8%; (d) y=1.2%

Fig. 2 XRD patterns of ySm-0.25PMN-0.75PZT ceramics (a) 10°-90°; (b) Near 45°

Fig. 3 PFM phase images (2 μm×2 μm) of ySm-0.25PMN-0.75PZT ceramics (a) y=0; (b) y=0.4%; (c) y=0.8%; (d) y=1.2%

Fig. 4 Temperature dependence of dielectric constant and dielectric loss of ySm-0.25PMN-0.75PZT ceramics (a) y=0, (b) y=0.4%, (c) y=0.8%, (d) y=1.2% @100 Hz-1 MHz; (e) y=0, 0.4%, 0.8%, 1.2%@1 kHz

Fig. 5 P-E loops of ySm-0.25PMN-0.75PZT ceramics

Table 1 Comprehensive property of ySm-0.25PMN-0.75PZT ceramics

y	d₃₃/(pC·N^-1)	g₃₃/(×10^-3, m²·C^-1)	ε_r	tanδ	E_c/(kV·mm^-1)	P_r/(μC·cm^-2)	T_c@1kHz/℃	k_p	k_t	k₃₃
0	543	24.8	2475	0.028	0.77	42.5	199	0.58	0.41	0.67
0.4%	824	27.1	3434	0.032	0.80	38.7	178	0.67	0.52	0.77
0.8%	678	20.5	3744	0.039	0.88	27.2	156	0.59	0.46	0.70
1.2%	522	13.9	4239	0.041	0.76	24.9	144	0.43	0.33	0.52

Table 2 Comparison of properties between ceramics in this work and literature

Ceramic	d₃₃/(pC·N^-1)	g₃₃/(×10^-3, m²·C^-1)	ε_r	T_c@1kHz/℃	Ref.
Sm-PMN-PT	1510	13.1	13000	89	[16]
PMN-PT	663	14.2	5260	159	[14]
PZT5H	590	19.6	3400	193	[36]
0.4%Sm-0.25PMN-0.75PZT	824	27.1	3434	177	This work

Fig. 6 Temperature dependences of dielectric constant of ySm-0.25PMN-0.75PZT@1 kHz from cryogenic temperature to room temperature

Fig. 7 Temperature dependence of properties for 0.4%Sm- 0.25PMN-0.75PZT ceramics (a) Piezoelectric coefficient, dielectric constant, residual polarization; (b) Field-induced longitudinal strain

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