Piezoelectric Properties of Lead-Free (Na,Bi)TiO₃–BaTiO₃(001) Epitaxial Thin Films around the Morphotropic Phase Boundary

Abstract

The piezoelectric properties and the crystallographic nature of (1-x)(Na,Bi)TiO3–xBaTiO3 (NBT–BT) thin films around the morphotropic phase boundary (MPB) composition (x=0.05–0.10) were studied. NBT–BT thin films were grown epitaxially on Pt(100)/MgO(100) substrates by RF magnetron sputtering and exhibited highly (001)-oriented single-phase perovskite with a tetragonal structure. A maximum piezoelectric coefficient e31 of -14.4 C/m2 was obtained at the x = 0.07 composition of the tetragonal side near MPB (x = 0.06). These results indicate that NBT–BT thin films around the MPB are a promising lead-free replacement for Pb(Zr,Ti)O3 (PZT) based applications.

Reduced leakage current and large polarization of Na0.5Bi0.5Ti0.98Mn0.02O3 thin film annealed at low temperature

“…However, for NBT thin film, its intrinsic performance is difficult to be measured because of low resistivity [7]. A variety of methods have been taken to overcome this drawback [8][9][10][11][12][13][14][15]. Among them, site engineering is one of the best available ways.…”

Effect of Fe doping on the crystallization and electrical properties of Na0.5Bi0.5TiO3 thin film

“…In recent years, people are trying to improve electrical properties for NBT thin film by a variety of methods, such as cation substitution [5], formation of multilayered structure [6], control of orientation [7], and forming solid solutions with other components [8][9][10][11][12]. Among them, site engineering is supposed to be an available way, not only for reducing the leakage current but also for improving the ferroelectric property of NBT film [13].…”

Piezoelectric properties of lead-free (Na0.5Bi0.5)0.95Ba0.05TiO3 thin films on polycrystalline nickel foils

“…Especially, the Asite complex perovskite (Na 0.5 Bi 0.5 )TiO 3 (BNT) system have been considered to be one of the most important promising candidates because of its excellent ferroelectric and piezoelectric properties [10][11][12][13][14][15]. BNT thin films have been fabricated on various oxide single-crystal substrates using a broad spectrum of techniques [16][17][18][19][20][21]. However, it is well known that the singlecrystal oxide substrates have high cost and limited sizes.…”