Journal ArticleDOI
Thermal depoling process and piezoelectric properties of bismuth sodium titanate ceramics
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TLDR
In this paper, an x-ray study revealed that a tetragonal phase exists in the temperature range between 330 and 480°C in BNT ceramic as well as BNT single crystals.Abstract:
Stoichiometric and nonstoichiometric (Bi05Na05)TiO3 (BNT) ceramics were prepared by a conventional ceramic fabrication process This study revealed that the high conductivity of BNT ceramics is associated with Bi vaporization during sintering An x-ray study revealed that a tetragonal phase exists in the temperature range between 330 and 480 °C in BNT ceramic as well as BNT single crystals In addition, the depolarization temperature Td, rhombohedral-tetragonal phase transition temperature TR-T, and the temperature Tm of the maximum dielectric constant were determined to be 187, approximately 300, and 325 °C, respectively, from the temperature dependences of dielectric properties using unpoled and poled specimens The piezoelectric properties of all vibration modes and the temperature dependences of the piezoelectric properties were measured using fully poled BNT ceramics It was also revealed that BNT ceramics exhibit three thermal depoling processes at Td, between Td and TR-T, and between TR-T and Tm read more
Citations
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Transferring lead-free piezoelectric ceramics into application
TL;DR: In this article, a figure of merit analysis for key devices is presented and used to contrast lead-containing and lead-free piezoceramics for demanding applications with high reliability, displacements and frequency as well as a wide temperature range.
Journal ArticleDOI
A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3
Ming Li,Martha J. Pietrowski,Roger A. De Souza,Huairuo Zhang,Ian M. Reaney,Stuart N. Cook,John A. Kilner,Derek C. Sinclair +7 more
TL;DR: This study demonstrates how to adjust the nominal NBT composition for dielectric-based applications and gives NBT-based materials an unexpected role as a completely new family of oxide ion conductors with potential applications in intermediate-temperature SOFCs and opens up a new direction to design oxide ions conductors in perovskite oxides.
Journal ArticleDOI
Recent development in lead-free perovskite piezoelectric bulk materials
TL;DR: In this paper, the authors highlighted the compelling physical properties of lead-free piezoelectric perovskite materials and summarized their state-of-the-art progress.
Journal ArticleDOI
Advances in Lead-Free Piezoelectric Materials for Sensors and Actuators
Elena Aksel,Jacob L. Jones +1 more
TL;DR: This review highlights recent developments in several lead-free piezoelectric materials including BaTiO3, Na0.5TiO 3, Na 0.5Bi0.4NbO3 and their solid solutions.
Journal ArticleDOI
Temperature-Dependent Properties of (Bi1/2Na1/2)TiO3–(Bi1/2K1/2)TiO3–SrTiO3 Lead-Free Piezoceramics
TL;DR: In this article, a large unipolar strain of 0.36% at a driving field of 6 kV/mm was obtained at room temperature for a SrTiO3 content of 5 mol%.
References
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Journal ArticleDOI
Lanthanum-substituted bismuth titanate for use in non-volatile memories
TL;DR: In this paper, the authors show that lanthanum-substituted bismuth titanate (SBT) thin films provide a promising alternative for FRAM applications, since they are fatigue-free on metal electrodes, they can be deposited at temperatures of ∼650°C and their values of Pr are larger than those of the SBT films.
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(Bi1/2Na1/2)TiO3-BaTiO3 System for Lead-Free Piezoelectric Ceramics
TL;DR: In this paper, a rhombohedral (Fα)-tetragonal (Fβ) morphotropic phase boundary (MPB) is shown to exist at x=0.06~0.07 by X-ray data, and dielectric and piezoelectric properties are investigated.
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Dielectric and Piezoelectric Properties of (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3 Systems
TL;DR: In this paper, the structural, dielectric and piezoelectric properties of [Bi0.5Na 0.5K 0.20]TiO3 ceramics were studied for the compositional range, X=0.16-0.20.
Journal ArticleDOI
Investigation of the structure and phase transitions in the novel A-site substituted distorted perovskite compound Na0.5Bi0.5TiO3
G. O. Jones,Pam A. Thomas +1 more
TL;DR: In this paper, the phase transition from the high-temperature prototypic cubic structure to one of tetragonal (673-773) and then rhombohedral structures (5-528) has been established.