Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Feature: Microstructural Design and Control of Ceramics through Sintering: Full papers
Microstructure and microchemistry of flash sintered K0.5Na0.5NbO3
Gulcan CORAPCIOGLUMehmet Ali GULGUNKim KISSLINGERSaso STURMShikhar.K. JHARishi RAJ
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2016 Volume 124 Issue 4 Pages 321-328

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Abstract

Flash sintering experiments were performed, for the first time, on sodium potassium niobate (KNN) ceramics. A theoretical density of 94% was achieved in 30 s under 250 V/cm electric-field at 990°C. These conditions are ∼100°C lower and faster than the conventional sintering conditions. Grains tended to grow after 30 s. flash sintering duration under constant electric-field. Detailed microstructural and chemical investigations of the sample showed that there was inhomogenous Na, K distribution and it resembles a core–shell structure where K is more in the shell and Na is more in the core region. The inhomogenous distribution of Na and K was correlated with the doubling of the unit cell within the grain along 002 direction. Compositional equilibrium is achieved after a heat treatment at 1000°C for 4 h. The compositional variations appeared to have been linked to grain boundary melting during flash and consequent recrystallization as the sample cooled.

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© 2016 The Ceramic Society of Japan
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