- Conference date: 3–7 December 2012
- Location: Indian Institute of Technology, Bombay, Mumbai, India
(KNN) ceramics are synthesized by solid state reaction method. The processing parameters such as calcination and sintering temperatures were optimized to get the stoichiometric KNN ceramics at lower processing temperatures. The effect of calination temperature on structural, microstructural and dielectric properties was investigated. The KNN ceramics calcined at 700°C and sintered at 950°C exhibited the best structural, microstructural, ferroelectric and dielectric properties. The dielectric studies revealed that that both the dielectric constant and tanδ of KNN ceramics as function of temperature exhibited two sharp phase transitions indicating orthorhombic to tetragonal and ferroelectric tetragonal to paraelectric cubic phases. The prepared ceramics exhibited fine ferroelectric properties of remnant polarization and coercive field are 8.8μC/cm2 and 11.01KV/cm, respectively.
- Ferroelectric phase transitions
- Dielectric properties
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