Mechanical properties of BaTiO3 open-porosity foams

Wucherer, Laurel; Nino, Juan C.; Subhash, Ghatu

doi:10.1016/j.jeurceramsoc.2008.12.018

Cited by 17 publications

(4 citation statements)

References 11 publications

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“…without any jumps and sharp changes of the slope on both branches, were included in the evaluation of elastic modulus and microhardness. Resulting indentation effective modulus (E) is 148 AE 22 GPa whereas values of about 125 GPa are reported in engineering databases (Matweb.com) and as low as 67 GPa in a research paper focused on thin ferroelectric films [20]. Corresponding average hardness is 8.1 AE 1.5 GPa.…”

Section: [ ( F I G _ 1 ) T D $ F I G ]mentioning

confidence: 99%

Structure and properties of plasma sprayed BaTiO3 coatings

Ctibor

Ageorges

Sedláček

et al. 2010

Ceramics International

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Plasma spraying enables to create layers with thickness in a millimeter range adhering on various substrates. This paper provides a study of electric and mechanical properties of BaTiO 3 coatings prepared by atmospheric plasma spraying. The spraying was carried out by a direct current gas-stabilized plasma gun. BaTiO 3 was fed into the plasma jet as a feedstock powder prepared by a reactive sintering of micrometer-sized powders of BaCO 3 and TiO 2 . Microstructure and phase composition are reported and discussed in connection with electric and mechanical properties. The ability of the used techniques to detect precisely the phase transformation temperatures of BaTiO 3 plasma sprayed coatings is discussed as well. A depth-sensing indentation measurement was done between 290 and 520 K to provide local mechanical characterization. The elastic modulus has shown slightly higher values than that reported typically in papers focused on BaTiO 3 ferroelectric thin films. The average Vickers microhardness is tested to characterize the samples in larger scale. A wear resistance in a slurry environment is reported as well. Dielectric properties are reported for the temperature window of existence of the tetragonal ferroelectric phase. Relative permittivity and loss factor are studied at frequency from 50 Hz to 1 MHz and temperature from 260 to 400 K. #

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Section: [ ( F I G _ 1 ) T D $ F I G ]mentioning

confidence: 99%

Structure and properties of plasma sprayed BaTiO3 coatings

Ctibor

Ageorges

Sedláček

et al. 2010

Ceramics International

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show abstract

“…It is found that the tailoring of filler architecture is an approach to the enhanced dielectric constant of composites, however, issues still exist. Fistly, it is challenging to obtain three-dimensional ceramics with increased performances in composites because of difficulties in simultaneously achieving the high microscopic uniformity and the macroscopic free-standing [17][18][19][20] . For instance, a relatively high loss of~0.14 at 1 kHz is obtained in Luo et al's work 16 at a filler loading of 30 vol%, which may be due to the method using lignocellulose templates is difficult to control the microstructure details of the network.…”

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confidence: 99%

Enhanced dielectric constant and energy density in a BaTiO3/polymer-matrix composite sponge

et al. 2020

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Polymer-matrix dielectric composites are promising for use in electrostatic energy storage devices due to the ultra-fast charge–discharge speed and the long service life. Here we report a strategy for designing BaTiO3 sponge polymer composites for energy storage. BaTiO3 sponges with tunable porosities are prepared from polymethyl methacrylate micro-sphere arrays. Liquid epoxy completely fills the pores in a BaTiO3 sponge during vacuum de-foaming, forming a solid composite. The resulting composites possess a maximum dielectric constant of εr~332 and εr/εm~85, compared to εr~38 in a sample filled with BaTiO3 NPs, at 1 kHz. The composites also possess, at 100 kV cm−1, a high discharge energy density of Ud~105 × 10−3 J cm−3 and Ud/Um~51, and electric displacement of 3.2 μC cm−2, compared with those utilizing traditional strategies at low electric fields. Finite element simulation reveals the enhanced energy density is due to a high local electric displacement in composites.

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“…[16,17] Finally, the samples were cut with a blade to the desired cylindrical shape with 12 mm diameter and 3 mm thickness. PU foam spray is a device that sprays PU foam in liquid form.…”

Section: Synthesismentioning

confidence: 99%

Synthesis, Characterization and Bioactivity Evaluation of Porous Barium Titanate with Nanostructured Hydroxyapatite Coating for Biomedical Application

et al. 2012

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Nano phase hydroxyapatite (HA) bioceramics have gained importance in the biomedical field due to their superior biological properties. In this study, nanostructured HA coating was used to increase the bioactivity of a piezoelectric bioceramic, barium titanate (BT). Early reports on the influence of collagen piezoelectricity in remodeling of bone have attracted many researchers to piezoelectric bioceramics such as BT. Hence; porous BT was used as the matrix of a new bone graft composite and then coated with nanostructured HA. BT ceramic was foamed via a direct foaming method with a spray of polyurethane foam. The surface of the foam voids was coated with HA via sol–gel and dip‐coating methods. X‐ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) techniques were used to characterize the prepared coated foam. XRD and TEM analysis showed that the HA coating had a nanostructure with crystallite size of 20–30 nm. SEM images of the prepared samples showed that the HA coating has about 25 µm thickness. The bioactivity of the prepared composite was evaluated in an in vitro study. The variation of Ca2+ and PO43− ions versus time in simulated body fluid (SBF) solution were measured by inductively coupled plasma (ICP) analysis during 1 month and the results showed that the mineralization of calcium phosphate (Ca‐P) on HA coated porous samples was much more than that in non‐coated sample. The SEM micrographs and energy‐dispersive X‐ray spectroscopy (EDS or EDX) analysis of the samples after 1 month of immersing in SBF confirm that Ca‐P phase (bone‐like apatite) was significantly mineralized on HA coated porous BT samples. It was concluded that the nanostructured HA coating would improve the bioactivity of BT foam.

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Mechanical properties of BaTiO3 open-porosity foams

Cited by 17 publications

References 11 publications

Structure and properties of plasma sprayed BaTiO3 coatings

Structure and properties of plasma sprayed BaTiO3 coatings

Enhanced dielectric constant and energy density in a BaTiO3/polymer-matrix composite sponge

Synthesis, Characterization and Bioactivity Evaluation of Porous Barium Titanate with Nanostructured Hydroxyapatite Coating for Biomedical Application

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