Sintering Effect on Electrical Properties and Morphology of Lead-Free Na0.92K0.08NbO3 Ceramics

  • Gambheer Singh Kathait Dept. of Instrumentation Eng.-USIC, H.N.B. Garhwal University
  • N. S. Panwar Dept. of Instrumentation Eng.-USIC, H.N.B. Garhwal University
  • Prashant Thapliyal Dept. of Instrumentation Eng.-USIC, H.N.B. Garhwal University
  • Don Biswas Dept. of Instrumentation Eng.-USIC, H.N.B. Garhwal University
  • Vishal Rohilla Dept. of Instrumentation Eng.-USIC, H.N.B. Garhwal University
  • Surendra Singh Department of Physics, H.N.B. Garhwal University

Abstract

Sodium potassium niobate (NKN) powders were synthesized by the solid-state reaction method. The NKN ceramics for composition Na0.92K0.08NbO3 (NKN) were then fabricated by a two-step sintering technique. The effects of the two-step sintering on the properties of the ceramics were investigated. The pure phase NKN was achieved for all sintering temperatures of 1100, 1150, 1200 and 1250 oC. The observed change in the microstructure indicates that the grain size increases with the increasing sintering temperatures. Also, the two-step sintering technique produced a higher value of K/(K+Na) weight-% ratio and peak dielectric constant for sintering temperatures 1100, 1150 and 1200 oC. However, further increasing of the sintering temperatures at 1250 oC, reduces the K/(K+Na) weight-% ratio and the peak dielectric constant (єc).

Published
2019-11-27
Issue
Vol 51 No 4 (2019)
Section
Articles

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