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Journal of the Korean Physical Society

, Volume 72, Issue 6, pp 726–730 | Cite as

Fabrication of Lead-free (K0.5Na0.5)1−xAg x NbO3 Ferroelectric Ceramics and Their Dielectric Properties

  • Jaeduk Byun
  • June Won Hyun
  • Yeon Jung Kim
  • Kristóf Bobor
Article
  • 43 Downloads

Abstract

In this study, lead-free (K0.5Na0.5)1−xAg x NbO3 (x = 0.00, 0.10, 0.15, 0.20, 0.25, and 0.30) ferroelectric ceramics were fabricated using solid-state synthesis without A-site and B-site manufacturing step. The (K0.5Na0.5)1−xAg x NbO3 ceramics were sintered at 1110 °C for 4 h after calcination at 800 °C for 3 h. The sintered sample was dense, and the grain size was 1.02 ~ 7.8 μm. For x ≤ 0.2, the sintered ceramic samples had a single perovskite structure. The temperature dependence of the dielectric constant in the (K0.5Na0.5)1−xAg x NbO3 was measured at 1 kHz using an LCR meter. The high dielectric constant properties could be obtained in (K0.5Na0.5)1−xAg x NbO3 ceramics. The orthorhombic-to-tetragonal phase transition temperature and ferroelectric Curie temperature decreased linearly with increasing mole fraction of the Ag content. The Curie temperature shifted from 393 °C for (K0.5Na0.5)NbO3 ceramics to 317 °C for (K0.5Na0.5)0.7Ag0.3NbO3 ceramics. The maximum dielectric constant was 8930 at 330 °C in the (K0.5Na0.5)0.8Ag0.2NbO3 ceramics.

Keywords

Dielectric constant Ferroelectric KNN Ceramics Perovskite 

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Copyright information

© The Korean Physical Society 2018

Authors and Affiliations

  • Jaeduk Byun
    • 1
  • June Won Hyun
    • 1
  • Yeon Jung Kim
    • 2
  • Kristóf Bobor
    • 3
  1. 1.Department of PhysicsDankook UniversityCheonanKorea
  2. 2.Center for Innovative Engineering EducationDankook UniversityYonginKorea
  3. 3.Department of Materials Science and EngineeringBudapest University of Technology and EconomicsBudapestHungary

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