Effects of Second Phase and Defect on Electrical Properties in Bi0.5Na0.5-xKxTiO3 Lead-Free Piezoelectric Ceramics

Pin Yi Chen; Cheng Sao Chen; Chen Chia Chou; Tseung Yuen Tseng; Haydn Chen

doi:10.4028/www.scientific.net/AMR.284-286.1343

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 284-286Effects of Second Phase and Defect on Electrical...

Effects of Second Phase and Defect on Electrical Properties in Bi_0.5Na_0.5-xK_xTiO₃ Lead-Free Piezoelectric Ceramics

Abstract:

Second phase and defect formation mechanism of (Bi_0.5(Na_1-xK_x)_0.5)TiO₃ (BNKT100x) ceramics were investigated using electron microscopy, x-ray photoelectron spectroscope (XPS) and electrical properties measurements. Experimental results indicated that second phase formation induces Bi-rich regions and compositional inhomogeneity within matrix due to thermodynamic stability of potassium titanate. Ti valence transition for BNKT ceramics sintered in air might be ascribed to formation of the secondary phase, rather than simply attributed to volatilization of bismuth. Li substitution at A-site in BNKT ceramics suppresses formation of the second phase and Ti valence transition. Appropriate Li doped BNKT ceramics suppress oxygen vacancies and titanium valence transition, and therefore decrease the leakage current.

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Periodical:

Advanced Materials Research (Volumes 284-286)

Pages:

1343-1348

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.284-286.1343

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Online since:

July 2011

Authors:

Pin Yi Chen, Cheng Sao Chen, Chen Chia Chou, Tseung Yuen Tseng, Haydn Chen

Keywords:

BNKT, Defect, Lead-Free Piezoelectric, Second Phase

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