Improvement in synthesis of (K0.5Na0.5)NbO3 powders by Ge4+ acceptor doping

doi:10.1007/s11706-016-0362-8

Front. Mater. Sci.

2016, Vol. 10

Issue (4) : 422-427 https://doi.org/10.1007/s11706-016-0362-8

RESEARCH ARTICLE

Improvement in synthesis of (K_0.5Na_0.5)NbO₃ powders by Ge⁴⁺ acceptor doping

Yajing ZHAO¹,Yan CHEN²,Kepi CHEN¹(

)

¹. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
². Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA

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Abstract

In this paper, the effects of doping with GeO₂ on the synthesis temperature, phase structure and morphology of (K_0.5Na_0.5)NbO₃ (KNN) ceramic powders were studied using XRD and SEM. The results show that KNN powders with good crystallinity and compositional homogeneity can be obtained after calcination at up to 900°C for 2 h. Introducing 0.5 mol.% GeO₂ into the starting mixture improved the synthesis of the KNN powders and allowed the calcination temperature to be decreased to 800°C, which can be ascribed to the formation of the liquid phase during the synthesis.

Keywords lead-free piezoelectrics potassium sodium niobate synthesis acceptor doping

Corresponding Author(s): Kepi CHEN

Online First Date: 16 November 2016 Issue Date: 24 November 2016

Cite this article:

Yajing ZHAO,Yan CHEN,Kepi CHEN. Improvement in synthesis of (K_0.5Na_0.5)NbO₃ powders by Ge⁴⁺ acceptor doping[J]. Front. Mater. Sci., 2016, 10(4): 422-427.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-016-0362-8
https://academic.hep.com.cn/foms/EN/Y2016/V10/I4/422

Fig.1 XRD patterns of (a) KNN and (b) KNN-Ge powders calcined for 2 h at different temperatures.

Fig.2 XRD patterns of (a) KNN and (b) KNN-Ge powders calcined at different sintering temperatures in the 2θ range 44°?48°.

Fig.3 SEM images of (K_0.5Na_0.5)NbO₃ powders calcined at 650°C?900°C for 2 h.

Fig.4 SEM images of (K_0.5Na_0.5)(Nb_0.995Ge_0.005)O₃ powders calcined at 600°C?850 °C for 2 h.

Fig.5 DSC curves of (K_0.5Na_0.5)NbO₃ and (K_0.5Na_0.5)(Nb_0.995Ge_0.005)O₃ powders calcined at 850°C for 2 h.

Tab.1 Piezoelectric properties of KNN-based ceramic at room temperature

Fig.6 P?E hysteresis loops of KNN and KNN-Ge ceramics sintered at 1060°C.

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