Ferroelectric Phase Transition Character of BCZT Lead-free Piezoelectric Ceramics

doi:10.11901/1005.3093.2016.378

Chinese Journal of Materials Research

2017, Vol. 31

Issue (4): 248-254 DOI: 10.11901/1005.3093.2016.378

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Ferroelectric Phase Transition Character of BCZT Lead-free Piezoelectric Ceramics

Bijun FANG¹(

), Xing LIU¹, Zhenqian ZHANG¹, Zhihui CHEN¹, Jianning DING¹(

), Xiangyong ZHAO², Haosu LUO³

1 School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, China
2 Department of Physics, Key Laboratory of Optoelectronic Material and Device, Shanghai Normal University, Shanghai 200234, China
3 Key Laboratory of Inorganic Function Material and Device, Chinese Academy of Sciences, Shanghai 201800, China

Cite this article:

Bijun FANG, Xing LIU, Zhenqian ZHANG, Zhihui CHEN, Jianning DING, Xiangyong ZHAO, Haosu LUO. Ferroelectric Phase Transition Character of BCZT Lead-free Piezoelectric Ceramics. Chinese Journal of Materials Research, 2017, 31(4): 248-254.

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Abstract

The ferroelectric phase transition characteristics of the (Ba_0.84Ca_0.15Sr_0.01)(Ti_0.90Zr_0.09Sn_0.01)O₃ (BCSTZS) ceramics were investigated by the temperature-dependent Raman spectroscopy and electrical performance. The Raman active modes of the BCSTZS ceramics can be assigned as modes such as v₃(LO), v₃(TO), v₄(LO), v₂(LO,TO), v₁(TO) and v₁(LO). The modes of v₃(LO) and v₄(LO) disappear abruptly when the temperature extends beyond 80 °C, indicating that the phase structure of the BCSTZS ceramics transforms from tetragonal ferroelectric (FE_T) phase to cubic paraelectric (P_C) phase. The intensity and line width of Raman modes v₃(TO), v₂(LO,TO), v₁(TO) and v₁(LO) exhibit notably anomalous change around room temperature (20℃) and 80℃, showing the signal of FE_O-FE_T (O indicating the orthorhombic ferroelectric phase) and FE_T-P_C phase transitions. The existence of Raman active-modes, maximum strain and d₃₃^* values above the T_C temperatures indicates that the local polar micro-regions still retain in the cubic matrix phase. With the increase of temperature the resonant (f_r) and antiresonant (f_a) frequencies approach to each other, the f_a shows a discontinuous jump around T_C, and the maximum strain and large signal d₃₃^* values decrease gradually, proving further the occurrence of the ferroelectric phase transition.

Key words: inorganic non-metallic materials lead-free piezoelectric ceramics ferroelectric phase transition Raman spectra BCSTZS electrical properties

Received: 04 July 2016

ZTFLH:

TQ174

Fund: Supported by National Natural Science Foundation of China (Nos.51577015 & 11304333), Prospective Joint Research Project of Jiangsu Province (No.BY2014037-06), Major Projects of Natural Science Research in Universities in Jiangsu Province (No.15KJA43002), and Priority Academic Program Development of Jiangsu Higher Education Institutions

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	Articles by authors
	Bijun FANG
	Xing LIU
	Zhenqian ZHANG
	Zhihui CHEN
	Jianning DING
	Xiangyong ZHAO
	Haosu LUO

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.378 OR https://www.cjmr.org/EN/Y2017/V31/I4/248

Fig.1 Temperature dependent Raman spectra of the BCSTZS ceramics upon heating

Fig.2 Raman spectra of the BCSTZS ceramics and the deconvolution of multiple Lorentzian peaks at 0℃ (a), 20℃ (b), 90℃ (c) and 120℃ (d)

Fig.3 Variations of wavenumber in the Raman modes as a function of temperature

Fig.4 The intensity of v₃(TO) (a),v₂(LO, TO) (b),v₁(TO) (c) and v₁(LO) (d) Raman modes at different temperatures upon heating

Fig.5 Line width of v₃(TO) (a), v₂(LO, TO) (b), v₁(TO) (c) and v₁(LO) (d) Raman modes at different temperatures upon heating

Fig.6 Temperature dependent resonant (f_r) and antiresonant (f_a) frequencies of the BCSTZS ceramics upon heating

Fig.7 The bipolar (a) and unipolar (b) strain curves, I-E hysteresis loops measured at 20 kV/cm and different temperatures; Temperature-dependent maximum strain and d₃₃^* values (d)

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