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Effect of BBS ‐Based Frit on the Low Temperature Sintering and Electrical Properties of KNN Lead‐Free Piezoceramics
Author(s) -
Li YueMing,
Shen ZongYang,
Li RunRun,
Wang ZhuMei,
Hong Yan,
Liao RunHua
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2012.02794.x
Subject(s) - frit , materials science , sintering , ceramic , dielectric , curie temperature , piezoelectricity , temperature coefficient , relative permittivity , analytical chemistry (journal) , composite material , permittivity , optoelectronics , condensed matter physics , chromatography , chemistry , physics , ferromagnetism
Using BaO – B 2 O 3 – SiO 2 ( BBS )‐based frit as sintering aid, the K 0.49 Na 0.51 NbO 3 ( 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 d 33 = 108 pC /N, planar electromechanical coupling coefficient k p = 41%, mechanical quality factor Q m = 225, relative dielectric constant ε r = 410, dielectric loss tan δ = 0.57% and Curie temperature T c = 400°C. This ceramic sample should be a good lead‐free candidate for actuators or high temperature sensors application due to its ultra‐low tan δ , relatively high Q m and T c .