Piezo and pyroelectricity in spark plasma sintered potassium sodium niobate (KNN) ceramics
IEEE Transactions on Dielectrics and Electrical Insulation(2020)
Abstract
We report fabrication and piezo- and pyroelectric characterizations of spark plasma sintered (SPS) lead-free K
0.5
Na
0.5
NbO
3
(KNN) ceramics. SPS sintering produced dense KNN (99% of the theoretical density) at sintering temperature as low as 900°C. A significant improvement in the dielectric, piezoelectric and pyroelectric properties is observed after annealing the sample at 925°C. The measured piezoelectric coefficient d
33
and pyroelectric coefficient of poled KNN ceramic are 94 pC/N and 22.84 μCm
−2
K
−1
, respectively. These values are high enough to focus on the further enhancement of the material properties through adequate control of the phase structure of the material for lead-free energy harvesting applications.
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Key words
lead-free,(K0.5Na0.5NbO3) KNN,spark plasma sintering (SPS),piezoelectric,pyroelectric
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