Polymorphic phase transition and excellent piezoelectric performance of (K0.55Na0.45)0.965Li0.035Nb0.80Ta0.20O3 lead-free ceramics

Abstract

Mn doping-induced structural and magnetic transformations in the antiferroelectric phase of the Bi1−xNdxFeO3 perovskites J. Appl. Phys. 112, 064105 (2012) Neutron diffraction study of stability and phase transitions in Cu-Sn-In alloys as alternative Pb-free solders J. Appl. Phys. 112, 053520 (2012) Communication: From graphite to diamond: Reaction pathways of the phase transition J. Chem. Phys. 137, 101101 (2012) Structural study in highly compressed BiFeO3 epitaxial thin films on YAlO3 A lead-free ceramic with the composition ͑K 0.55 Na 0.45 ͒ 0.965 Li 0.035 Nb 0.80 Ta 0.20 O 3 was found having an outstanding piezoelectric performance. It possesses high piezoelectric properties of d 33 a͒ Electronic mail: zhangjialiang@sdu.edu.cn. APPLIED PHYSICS LETTERS 95, 022909 ͑2009͒

Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

“…As observed, P r first enhanced and then deteriorated with increasing x. The enhanced P r was associated with easy switched domain in the consistence of T and R phases (PPT region), and the similar results were reported in the literature [36,37]. The increased E c with excessive IrO 2 content was attributed to a high restoring force of domain owing to the dipole defects in the distorted crystal structure [38].…”

“…Specifically, Q m reached a minimum value of 78.17 at x = 0.4 %, and the relative lower Q m than the literature could enhance the frequency band of the electron component [15,28]. The observed trend around PPT regions was attributed to the relatively low internal stress and weak pinching effects of the domain wall in the PPT region [36,37].…”

A monoclinic-tetragonal ferroelectric phase transition in lead-free (K0.5Na0.5)NbO3-x%LiNbO3 solid solution

“…39 Thus, a variety of substituents (including LiNbO 3 , LiTaO 3 and LiSbO 3 ) have been added to KNN to form new KNN-based ceramics with improved relative densities and piezoelectric properties. 6,9,10,12,[40][41][42] 4,46,47 Monoclinic (M) phases are well known in Pb-based perovskites that are sandwiched between ferroelectric R and T phases near a morphotropic phase boundary (MPB). [48][49][50][51] These M phases are believed to be important to the high piezoelectricity of MPB systems, as the lower symmetry allows the polarization to rotate between pseudocubic h111i and h001i directions.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12] In particular, some (K,Na,Li)(Nb,-Ta,Sb)O 3 ceramics exhibit longitudinal piezoelectric coefficients of d 33 ! 400 pC=N, 1,13 which is nearly comparable with that of "soft" Pb(Zr,Ti)O 3 materials such as PZT-5A.…”

Electrical properties of B site substituted (K0.48Na0.52)(W2/3Bi1/3)xNb1−xO3 piezoceramics

“…Due to the toxicity of lead oxide, numerous investigators have been developing alternative materials to PZT ceramics and among the lead-free piezoelectric compositions, (Na 0.5 K 0.5 )NbO 3 -based (KNN) materials have been considered as the good candidate because of their strong piezoelectricity and high Curie temperature [1][2][3]. For the KNN system, many compositions have focused on A or B site equivalent substitution (e.g., Li, Sb, Ta) and exhibit a piezoelectric coefficient d 33 larger than 200 pC/N [3][4][5][6][7][8][9]. However, the good properties are derived from the coexistence of orthorhombic and tetragonal phase or what is the called polymorphic phase boundary (PPB) structure.…”