Crystals (Aug 2021)

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na<sub>0.48</sub>K<sub>0.473</sub>Li<sub>0.04</sub>Sr<sub>0.007</sub>) (Nb<sub>0.883</sub>Ta<sub>0.05</sub>Sb<sub>0.06</sub>Ti<sub>0.007</sub>)O<sub>3</sub> Ceramics

  • Cheng-Shong Hong,
  • Yuan-Xin Zhang,
  • Yi-Tian Hong

DOI
https://doi.org/10.3390/cryst11080935
Journal volume & issue
Vol. 11, no. 8
p. 935

Abstract

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In this paper, the effects of CuO sintering aids on microstructure and electric properties are investigated for the non-stoichiometric (Na0.48K0.473Li0.04Sr0.007)(Nb0.883Ta0.05Sb0.06Ti0.007)O3+x mol% CuO lead free ceramics. As the amounts of CuO equal 1 mol%, the sintering temperature is 975 °C and the piezoelectric parameters are d33 = 200 pC/N, g33 = 38 (10−3 Vm/N), d33 × g33 = 7600 (10−15 m2/N), kp = 0.38, Qm = 240, Pr = 18.93 μC/cm2 and EC = 8.75 kV/cm. The piezoelectric properties are changed to hard type and suitable for energy harvester with multilayer technology. The physical response mechanisms are suggested that the diffused phase transitions are enhanced, the Cu2+ ions substitute for the B-site ions with forming the Oxygen vacancies and the domain walls are pinning.

Keywords