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2016 Vol.26, Issue 12 Preview Page
Electrical Properties of Lead Free (1-x)(Na0.5K0.5) NbO3-xLiNbO3 Piezoelectric Ceramics
Jong-Ho Park1†
,
Hui-Jin Park2
,
Byung-Chun Choi2
1Department of Science Education, Chinju National University of Education, Jinju 52673, Republic of Korea
2Department of Physics, Pukyong National University, Pusan 48513, Republic of Korea
†Corresponding author E-Mail : parkkdp@cue.ac.kr (J.-H. Park, Chinju Nat'l Univ. Edu.)
December 2016. pp. 721-725
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Abstract

This work focuses on the electrical conduction mechanism in a lead free (Na0.5K0.5NbO3 ; NKN) ceramics system with LiNbO3 content of approximately critical concentration x ≥ 0.2. Lead free (1-x)(Na0.5K0.5)NbO3 - x(LiNbO3), NKN-LNx (x = 0.1, 0.2) ceramics were synthesized by solid-state reaction method. Crystal structures are confirmed by X-ray diffraction. The electric-mechanical bond coefficient k p decreases and the phase transition temperature T c increases with increasing x content, as determined by dielectric and piezoelectric measurements. The value of the real dielectric constants ε' and kBTε'' showed anomalies around T c (462 °C in the NKN-LN0.1 and 500 °C in the NKN-LN0.2). For the ionic conduction of mobile ions, the activation energies are obtained as EI = 1.76 eV (NKN-LN0.1) and EI = 1.55 eV (NKN-LN0.2), above T c, and EII = 0.78 (NKNLN0.1) and EII = 0.81 (NKN-LN0.2) below T c. It is believed that the conduction mechanisms of NKN-LNx ceramics are related to ionic hopping conduction, which may arise mainly due to the jumping of Li+ ions.

Keywords
Pb-free
electrical conductivity
dielectric
piezoelectric
ionic hopping
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 26
  • No :12
  • Pages :721-725
  • Received Date : 2016-07-21
  • Revised Date : 2016-11-09
  • Accepted Date : 2016-11-09
  • DOI :https://doi.org/10.3740/MRSK.2016.26.12.721
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