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Low‐Temperature Sintered K 0.5 Na 0.5 NbO 3 ‐Based Ceramics for Vibratory Gyro‐sensor Applications
Author(s) -
Wong Mau Tak,
Kwok Kin Wing
Publication year - 2014
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/ijac.12344
Subject(s) - materials science , sintering , ceramic , natural bond orbital , analytical chemistry (journal) , piezoelectricity , doping , temperature coefficient , dielectric , atmospheric temperature range , sensitivity (control systems) , composite material , optoelectronics , electronic engineering , thermodynamics , chemistry , physics , chromatography , density functional theory , computational chemistry , engineering
0.91K 0.47 Na 0.47 Li 0.06 NbO 3 ‐0.09NaSbO 3 lead‐free piezoelectric ceramics were prepared at 1000°C using a sintering aid comprising of Cu and Ba in a molar ratio of 71.5/28.5. A dense structure with a high density of 4.43 g/cm 3 was obtained for the ceramic added with 2.5 wt% of the sintering aid. Probably due to the smaller grains and doping of Cu 2+ , the piezoelectric coefficient and dielectric loss were reduced to 120 pC/N and 1.0%, respectively. The ceramics were then fabricated into vibratory gyro sensors of dimensions 0.6 mm × 0.6 mm × 4 mm; and good sensitivity (~0.7 mV/dps) was obtained in the range of −360 to 360 dps.