Improved temperature stability of CaTiO 3 -modified [ ( K 0.5 Na 0.5 ) 0.96 Li 0.04 ] ( Nb 0.91 Sb 0.05 Ta 0.04 ) O 3 lead-free piezoelectric ceramics J. Appl. Phys.Effects of K content on the dielectric, piezoelectric, and ferroelectric properties of 0.95 ( K x Na 1 − x ) NbO 3 − 0.05 LiSbO 3 lead-free ceramics
Articles you may be interested inInvestigation on transition behavior and electrical properties of (K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 around polymorphic phase transition region AIP Advances 4, 017125 (2014); 10.1063/1.4863200 Improved temperature stability of CaTiO 3 -modified [ ( K 0.5 Na 0.5 ) 0.96 Li 0.04 ] ( Nb 0.91 Sb 0.05 Ta 0.04 ) O 3 lead-free piezoelectric ceramics J. Appl. Phys.͑K 0.44−x Na 0.52 Li 0.04 Ag x ͒͑Nb 0.91 Ta 0.05 Sb 0.04 ͒O 3 lead-free piezoelectric ceramics were prepared by normal sintering. The effects of Ag content on the phase structure and piezoelectric properties of the ceramics were mainly studied. These results show that the phase structure undergoes a transition from orthorhombic to tetragonal phase with increasing x from 0.00 to 0.06. The optimum Ag content enhances the piezoelectric properties, and the Curie temperature increases with increasing x. The ceramics with x = 0.02 exhibit enhanced electrical properties ͑d 33 ϳ 263 pC/ N, k p ϳ 45.3%, T C ϳ 353°C, r ϳ 1478, and tan ␦ ϳ 2.3%͒ and good aging characteristics. These results show that the ceramic with x = 0.02 is a promising lead-free piezoelectric material.
The effects of K content on the dielectric, piezoelectric, and ferroelectric properties of 0.95(KxNa1−x)NbO3−0.05LiSbO3 (0.95KxNN−0.05LS) (x=0.25–0.75) lead-free piezoelectric ceramics prepared by conventional solid-state sintering were studied. The experimental results show that the dielectric, piezoelectric, and ferroelectric properties strongly depend on K content in the 0.95KxNN−0.05LS ceramics. The 0.95KxNN−0.05LS (x=0.40) ceramics exhibit enhanced electrical properties (d33≈280 pC/N; kp≈49.4%; Tc∼364 °C; To-t=25 °C; εr≈1463; tan δ≈2.3%; Pr∼30.8 μC/cm2; Ec∼14.0 kV/cm). The enhanced electrical properties of 0.95KxNN−0.05LS (x=0.40) ceramics are attributed to the polymorphic phase transition near room temperature. These results show that 0.95KxNN−0.05LS (x=0.40) ceramic is a promising lead-free piezoelectric material.
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