(1 − x)Ba(Zr_0.2Ti_0.8)O₃–x(Ba_0.7Ca_0.3)TiO₃ Ferroelectric Thin Films Prepared from Chemical Solutions

Abstract

Using chemical solution approach on Pt/Ti/SiO2/Si substrates (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 (BZT–BCT) ferroelectric thin films were prepared for the first time. Dense and crack‐free films with perovskite structure were obtained from appropriately produced precursor solution through a multiple spin‐coating process in which the individual layers were pyrolyzed at different temperatures. The effects of composition and annealing temperature on the resulting structure and properties were examined. The optimized BZT–BCT thin film exhibited a high dielectric constant of 2913 with a low dielectric loss of 0.06, and a high remnant polarization of 15.8 μC/cm2 with a large coercive field of 58 kV/cm, and an effective piezoelectric coefficient d33 of 71.7 pm/V under the substrate clamping. These properties are discussed in comparison with the bulk ceramic counterpart, and the results showed that the polarization rotation and strain were restricted to a large extent in the thin films.

Synthesis and characterization of the pyrochlore Bi1.56Sb1.48−xNbxCo0.96O7 solid solution

“…In 1931, Von Gaertner et al described the structure of the ideal oxide pyrochlores. The overall formula of pyrochlore is A 2 B 2 O 7 , and it is often written as A 2 6 ] octahedral sharing all vertices to form large cavities [8]. The present study gives the impact of niobium substitution for antimony in Bi 1 [10] showed that antimony exhibit a 5+ oxidation valence.…”

“…These include dielectric, ferroelectric, piezoelectric, ferromagnetic, anti-ferromagnetic materials, temperature-stable high-permittivity properties, catalytic behavior, colossal magnetoresistance and host matrix for nuclear waste materials [1][2][3][4][5][6][7]. In 1931, Von Gaertner et al described the structure of the ideal oxide pyrochlores.…”

Composition dependence of ferroelectric and piezoelectric properties of epitaxial (1−x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 thin films prepared by pulsed laser deposition

“…These factors are processing and technique dependent and may lead to diverse properties of the thin films. Kang et al [11] found the best ferroelectric characteristic lied at x = 0.45 with a remnant polarization P r of 15.8 C/cm 2 in CSD-produced BZT-xBCT thin films while P r reached 22.15 C/cm 2 when x = 0.5 with spin-coating approach [12]. Lin et al [13] employed sol-gel method and the largest tunability up to 65% at 400 kV/cm at 100 kHz was achieved in BZT-0.55BCT film.…”

“…Various techniques such as chemical solution deposition (CSD), RF magnetron sputtering, pulsed laser deposition (PLD) etc. were employed to achieve high quality BZT-xBCT thin films [11][12][13][14][15][16]. However, due to the lack of composition-dependence study in BZT-xBCT thin film, the optimal composition in thin film form and the origins of their excellent piezoelectric properties still remain in question.…”

Effect of BiFeO3 addition on Bi2O3–ZnO–Nb2O5 based ceramics

“…Recently, Bi 2 O 3 -ZnO-Nb 2 O 5 (BZN) dielectric ceramics have received more and more attractions due to their excellent dielectric properties [9][10][11][12][13][14][15]. There are two major structural phases in this system: a cubic pyrochlore based on the Bi 1.5 ZnNb 1.5 O 7 composition and a lower symmetry monoclinic pyrochlore based on the Bi 2 (Zn 1/3 Nb 2/3 ) 2 O 7 composition.…”