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  Physics Express 2012, 2: 7
  Research Article
Structure, dielectric and piezoelectric properties of (K0.48Na0.48Li0.04) 1-xBax/2(Nb0.90Sb0.06Ta 0.04)O3 lead-free ceramics
  Dunmin Lina,b, K.W. Kwokb  
a College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, Chengdu 610066, PR China
b Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China

  Lead-free (K0.48Na0.48Li0.04) 1-x Ba x/2 (Nb0.90 Sb 0.06Ta 0.04)O3 ceramics have been fabricated by a conventional ceramic technique and their structure, dielectric and piezoelectric properties have been studied. The results of X-ray diffraction and temperature dependence of relative permittivity ?r show that the ceramics with a pure perovskite structure changes from the coexistence of tetragonal and orthorhombic phases to orthorhombic phase with x increasing and the ferroelectric tetragonal-ferroelectric orthorhombic phase transition shifts to high temperature. After the introduction of Ba2+, the grain growth is inhibited and a diffuse phase transition is induced. The piezoelectric properties of the ceramics are enhanced slightly at x=0.005, giving piezoelectric coefficient d33 = 276 pC/N, electromechanical coupling factors kp = 52.8% and kt = 49.4%. Our results show that K0.5Na0.5NbO3-based ceramics with donor doping exhibit different electrical characteristics from Pb(Zr,Ti)O3 ceramics with donor doping.
  Lead-free piezoelectric ceramics; K0.5Na0.5NbO3; Dielectric properties; Piezoelectric properties  

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