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Wu, Aiying; Salvado, Isabel M. Miranda; Vilarinho, Paula M.; Baptista, J. M.; Silvestre, Armando J. D.

doi:10.1023/a:1008750403880

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…The microwave assisted PZT shows a higher dielectric constant, possibly related to the dense material, which is caused by the packing of small grains. Wu et al [3] have also indicated that the dielectric constant increases on increasing the denseness of the PZT. and E c decreases to 10 kV cm −1 for the microwave assisted PZT samples.…”

Section: Dielectric Propertiesmentioning

confidence: 94%

“…Since then this smart ceramic has been widely used for commercial applications for piezoelectric materials. The use of PZT ceramics has increased rapidly in naval sonar transducers, ferroelectric memories, optical filters, shutters, actuators, and modulators [1][2][3]. The reasons for using PZT smart materials for these applications include a large piezoelectric coefficient, large coupling factor, high Curie temperature and a higher use temperature [4].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and piezoelectric properties of microwave sintered PZT

Sharma

Ounaies

Varadan

2001

Smart Mater. Struct.

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In this paper, the dielectric and piezoelectric properties of sol-gel derived and microwave sintered PZT are presented. It has been observed that the microwave sintering results in a material with a higher dielectric constant (≈1600) than that sintered by conventional methods (≈1480). It also offers a low dielectric loss tangent and improved d 33. Pellets sintered by the microwave method at 1100 • C are found to have high hardness (≈1460 MPa) on the Vickers hardness scale with a theoretical density of ≈94% in comparison with that sintered by the conventional method (i.e. ≈980 MPa and ≈84%). From a hysteresis study, the remanent polarization (P r) and coercive field (E c) of the microwave sintered PZT are observed to be 340 mC m −2 and 10 kV cm −1 , respectively. The value of E c in the microwave sintered sample is low and this property is desirable for device fabrication of PZT-based smart structures.

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Section: Dielectric Propertiesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Dielectric and piezoelectric properties of microwave sintered PZT

Sharma

Ounaies

Varadan

2001

Smart Mater. Struct.

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“…PZT films of different Zr/Ti ratios (20:80, 30:70, 52:48 and 60:40, hereafter referred as PZT20/80, PZT30/70, PZT52/48 and PZT60/40, respectively) were prepared using a diol-based sol-gel process [16]. The starting precursors were lead acetate trihydrate, Zr n-propoxide and Ti isopropoxide.…”

Section: Methodsmentioning

confidence: 99%

Domain populations in lead zirconate titanate thin films of different compositions via piezoresponse force microscopy

Vilarinho

Shvartsman

et al. 2005

Nanotechnology

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Pb(Zr x Ti 1−x )O 3 (PZT) thin films with (111) texture were deposited onto commercially available Pt/Ti/SiO 2 /Si substrates via the sol-gel technique. Piezoforce microscopy (PFM) was then used to analyse the evolution of domain populations as a function of the Zr content x. Domain structures of virgin films, local piezoelectric properties of individual grains and piezoelectric histograms were studied in films with different compositions (x = 0.2-0.6), which cover both the tetragonal and rhombohedral sides of the phase diagram. In films with low Zr content mainly single-domain grains were observed. As the Zr content increased, a larger fraction of polydomain grains was found. The local piezoelectric response measured inside sufficiently big grains indicated that the strongest piezoelectric effect occurs in PZT30/70 (x = 0.3) films. This was attributed to two different effects: high out-of-plane polarization achieved due to the (111) texture and influence of the dielectric constant. In tetragonal films with their lower dielectric constants the electric field seen by a ferroelectric is higher as compared to other compositions, giving rise to an apparent increase of the effective piezoelectric response measured by PFM. The analysis of the domain images indicated that sol-gel derived PZT films are slightly self-polarized near the free surface. With increasing Zr/Ti ratio, the variation of domain populations resulted in reversing the sign of the average piezoelectric response at x ≈ 0.3. It is demonstrated that PFM histograms are extremely sensitive to PZT composition and can be used as a signature of complex domain structures in ferroelectric thin films.

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Unveiling the Role of CNTs in the Phase Formation of One-Dimensional Ferroelectrics

Mahajan

Reaney

Costa³

et al. 2015

Langmuir

Self Cite

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Carbon nanotubes (CNTs) have the potential to act as templates or bottom electrodes for three-dimensional (3D) capacitor arrays, which utilize one-dimensional (1D) ferroelectric nanostructures to increase the memory size and density. However, growing a ferroelectric on the surface of CNTs is nontrivial. Here, we demonstrate that multiwalled (MW) CNTs decrease the time and temperature for the formation of lead zirconium titanate Pb(Zr1-xTix)O3 (PZT) by ∼100 °C commensurate with a decrease in activation energy from 68 ± 15 to 27 ± 2 kJ/mol. As a consequence, monophasic PZT was obtained at 575 °C for MWCNTs/PZT, but for pure PZT, traces of pyrochlore were still present at 650 °C, where the PZT phase formed due to homogeneous nucleation. The piezoelectric nature of MWCNTs/PZT synthesized at 500 °C for 1 h was proven. Although further work is required to prove the concept of 3D capacitor arrays, our result suggests that it is feasible to utilize MWCNTs as templates/electrodes for the formation of 1D PZT nanoferroelectrics.

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Untitled

Cited by 10 publications

References 12 publications

Dielectric and piezoelectric properties of microwave sintered PZT

Dielectric and piezoelectric properties of microwave sintered PZT

Domain populations in lead zirconate titanate thin films of different compositions via piezoresponse force microscopy

Unveiling the Role of CNTs in the Phase Formation of One-Dimensional Ferroelectrics

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