Effects of Ag content on the phase structure and piezoelectric properties of (K0.44−xNa0.52Li0.04Agx)(Nb0.91Ta0.05Sb0.04)O3 lead-free ceramics

Abstract

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.

Phase structure, microstructure and ferroelectric properties of (1−x)[(K0.50Na0.50)0.94Li0.06](Nb0.94Sb0.06)O3–xCaTiO3 lead-free ceramics

“…These results indicate the (1 − x)KNLNS-xCT ceramics with x = 0.01 possess optimum piezoelectric properties at room temperature (d 33 ∼252 pC/N and k p ∼49%) [17]. Usually, the polymorphic phase transition (PPT) near or at room temperature is responsible for the improved piezoelectric properties of KNN-based ceramics [3,5,12]. However, the PPT of the (1 − x)KNLNS-xCT ceramics with x = 0.01 was shifted to below room temperature (Fig.…”

“…Considerable attention for lead-free piezoelectric ceramics was recently given to (K 0.50 Na 0.50 )NbO 3 (KNN)-based ceramics for their excellent piezoelectric properties, high Curie temperature and environmental friendliness [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The different additions are added into KNN to form new KNN-based ceramics for improving the densification and piezoelectric properties, such as KNN-LiSbO 3 [3], KNN-LiNbO 3 [6], KNN-LiNbO 3 -AgTaO 3 [8], and so on.…”

Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramic

“…[2][3][4][5] In this regard, several lead-free systems have emerged out including (Na 0.5 K 0.5 )NbO 3 (NKN), ZnO, (Bi 0.5 Na 0.5 )TiO 3 (BNT), and BaTiO 3 (BT) based compositions. 2,[6][7][8][9][10] Although the piezoelectric coefficient values of NKN and BNT systems have been improved using site engineering, [11][12][13] sintering aid 14 or a new synthesis technique; 2 their main drawbacks include the presence of highly volatile elements like Bi, Na, and K. This results in poor densification that leads to degradation in the physical properties.…”

Review: environmental friendly lead-free piezoelectric materials

“…Effect of other ions such as Ag, Nb, Ta, Bi, Cu, Ca, etc. and combination two or three cations on KNN-LS ceramics were also studied by many authors [96][97][98][99][100][101][102][103][104][105][106][107][108] and promising results were reported. Wang et al reported that addition of Ag in KNN-LiTaO 3 ceramics increases the Curie temperature (T c = 438°C) and piezoelectric properties (d 33 = 252 pC/N) of the ceramic by normal sintering technique [109].…”