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2019 Vol.29, Issue 3 Preview Page
Effect of MnO2 and CuO Addition on Microstructure and Piezoelectric Properties of 0.96(K0.5Na0.5)0.95Li0.05Nb0.93Sb0.07O3-0.04BaZrO3 Ceramics
Kyung-Hoon Cho†
School of Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea
†Corresponding author E-Mail : khcho@kumoh.ac.kr (K.-H. Cho, Kumoh Nat’l Inst. Tech.)
March 2019. pp. 150-154
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Abstract

This study investigates the effect of MnO2 and CuO as acceptor additives on the microstructure and piezoelectric properties of 0.96(K0.5Na0.5)0.95Li0.05Nb0.93Sb0.07O3-0.04BaZrO3, which has a rhombohedral-tetragonal phase boundary composition. MnO2 and CuO-added 0.96(K0.5Na0.5)0.95Li0.05Nb0.93Sb0.07O3-0.04BaZrO3 ceramics sintered at a relatively low temperature of 1020 °C show a pure perovskite phase with no secondary phase. As the addition of MnO2 and CuO increases, the sintered density and grain size of the resulting ceramics increases. Due to the difference in the amount of oxygen vacancies produced by B-site substitution, Cu ion doping is more effective for uniform grain growth than Mn ion doping. The formation of oxygen vacancies due to B-site substitution of Cu or Mn ions results in a hardening effect via ferroelectric domain pinning, leading to a reduction in the piezoelectric charge coefficient and improvement of the mechanical quality factor. For the same amount of additive, the addition of CuO is more advantageous for obtaining a high mechanical quality factor than the addition of MnO2.

Keywords
Pb-free
piezoelectric
acceptor doping
hardening
oxygen vacancy
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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 : 29
  • No :3
  • Pages :150-154
  • Received Date : 2019-02-12
  • Revised Date : 2019-02-19
  • Accepted Date : 2019-02-20
  • DOI :https://doi.org/10.3740/MRSK.2019.29.3.150
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