Effect of BBS-Based Frit on the Low Temperature Sintering and Electrical Properties of KNN Lead-Free Piezoceramics

Using BaO–B2O3–SiO2 (BBS)‐based frit as sintering aid, the K0.49Na0.51NbO3 (KNN) + x wt% BBS (x = 1.0, 1.5, 2.0 and 2.5) lead‐free piezoelectric ceramics were successfully fabricated by solid‐state reaction method under low‐sintering temperature of 1000°C. The effect of BBS frit doping amount on the...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2013-09, Vol.10 (5), p.866-872
Main Authors: Li, Yue-Ming, Shen, Zong-Yang, Li, Run-Run, Wang, Zhu-Mei, Hong, Yan, Liao, Run-Hua
Format: Article
Language:English
Subjects:
Actuators
Ceramics
Curie temperature
Dielectric loss
Electrical properties
Frit
Lead free
Piezoelectric ceramics
Sintering
Tangents
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Summary:Using BaO–B2O3–SiO2 (BBS)‐based frit as sintering aid, the K0.49Na0.51NbO3 (KNN) + x wt% BBS (x = 1.0, 1.5, 2.0 and 2.5) lead‐free piezoelectric ceramics were successfully fabricated by solid‐state reaction method under low‐sintering temperature of 1000°C. The effect of BBS frit doping amount on the structure and electrical properties of the ceramics was investigated. The KNN ceramics with 1.5 wt% BBS frit showed optimal properties as follows: piezoelectric constant d33 = 108 pC/N, planar electromechanical coupling coefficient kp = 41%, mechanical quality factor Qm = 225, relative dielectric constant εr = 410, dielectric loss tanδ = 0.57% and Curie temperature Tc = 400°C. This ceramic sample should be a good lead‐free candidate for actuators or high temperature sensors application due to its ultra‐low tanδ, relatively high Qm and Tc.
ISSN:1546-542X
1744-7402
DOI:10.1111/j.1744-7402.2012.02794.x