Self-propagating high-temperature synthesis of barium titanate and subsequent densification by spark plasma sintering (SPS)

Licheri, Roberta; Fadda, Sarah; Orrù, Roberto; Cao, Giacomo; Buscaglia, Vincenzo

doi:10.1016/j.jeurceramsoc.2006.08.004

Cited by 45 publications

(27 citation statements)

References 37 publications

(50 reference statements)

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“…They were also able to prepare nanosized powders with grain sizes in the range 20-30 nm by the self-propagating high-temperature synthesis method and subsequent mechanical milling. [103] The ceramics obtained by SPS from those powders exhibited relative densities in the range 66-99%. The Curie temperature was again shifted to lower temperatures (108 8C) and the relative dielectric constant significantly depressed by the dilution effect, due to the presence of a non-ferroelectric low permittivity grain boundary layer.…”

Section: Batio 3 -Based Lead-free Materialsmentioning

confidence: 99%

“…SPS technology is particularly suitable for control of the grain size of the materials, of course depending on the average particle size of the precursor powders. The synthesis methods chosen to obtain nanosized powders are: sol-gel, [99][100] coprecipitation, [94,99,[101][102] self-propagating high-temperature synthesis [103] and hydrothermal processing. [104][105] The works of Li et al [94,99] analyze the influence of both synthesis method and SPS conditions, such as heating rate, holding time and sintering temperature, etc., on the densification, grain size, grain shape and dielectric properties of the obtained material.…”

Section: Batio 3 -Based Lead-free Materialsmentioning

confidence: 99%

“…The most studied material is BaTiO 3 . [96][97][98][99][100][101][102][103][104][105][106] These studies provide evidence of the influence of the size effects on the properties of the materials. Specifically, a systematic investigation of the crystal structure, phase transitions, and permittivity of dense BaTiO 3 ceramics, with grain sizes in the range 50-1 200 nm, shows that, as grain size decreases the crystal structure at room temperature becomes progressively less tetragonal and the Curie temperature, obtained from either permittivity or calorimetric measurements, shifts to lower values (Fig.…”

Section: Final Remarks On Nanostructuring Using Spark Plasma Sinteringmentioning

confidence: 99%

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Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo‐Ferroelectric Materials

2009

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Section: Batio 3 -Based Lead-free Materialsmentioning

confidence: 99%

Section: Batio 3 -Based Lead-free Materialsmentioning

confidence: 99%

Section: Final Remarks On Nanostructuring Using Spark Plasma Sinteringmentioning

confidence: 99%

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Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo‐Ferroelectric Materials

2009

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“…The combination of core-shell grains and increased internal stress resulted in an essentially flat permittivity response on a changing temperature. As a consequence of the rapid cooling and the reducing conditions a microstructure inducing a space charge layer effect was reported [49]. This space charge is responsible for high losses and for the strong frequency dispersion of relative permittivity [48].…”

Section: Combination Of the Techniques Usedmentioning

confidence: 99%

Phase stabilization in plasma sprayed BaTiO3

Ctibor

Seiner

Sedláček

et al. 2013

Ceramics International

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This paper presents a comparison of properties of BaTiO 3 ceramics prepared by two different production methods: gas-stabilized plasma spraying (GSP) and spark plasma sintering (SPS). Samples of both materials were evaluated by various techniques, the goal being to detect the Curie temperature of the ferroelectric transformation between the tetragonal and the cubic phase. All tests, resonant ultrasound spectroscopy, dielectric measurements, differential scanning calorimetry and temperature-resolved X-ray diffraction (XRD), used in combination, proved the absence of this transformation in the case of GSP coating up to 500 1C. Similarly, the tetragonal-toorthorhombic transition temperature is shifted downwards, this transition probably taking place in a small fraction of the volume of coating. The SPS samples exhibit several anomalies, such as a strong anisotropy of relative permittivity, but their phase transformations were detected in the usual temperature ranges.

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“…Recently, new techniques like spark plasma sintering have attracted much attention. Spark plasma sintering enables ceramic powders to be fully sintered at a relatively low temperature in a very short time [20][21][22][23]. It involves directly applying a pulsed direct current to the sintering powders, generating high-energy plasma between the powder particles that provides heat and promotes sintering.…”

Section: Introductionmentioning

confidence: 99%

PTCR characteristics and microstructure of porous (Ba,Sr)TiO3 ceramics prepared by spark plasma sintering

et al. 2010

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Porous Y-doped (Ba,Sr)TiO3 ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO3 powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO3 ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO3 ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO3 ceramics increased to a few µm and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO3 ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO3 ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 × 10 6 , which was ten times higher than the PTCR jump in (Ba,Sr)TiO3 ceramics. The electrical resistivity of the porous (Ba,Sr)TiO3 ceramics was recovered as the atmosphere changed from a reducing gas (N2) to an oxidizing gas (O2) under consecutive heating and cooling cycles.

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Self-propagating high-temperature synthesis of barium titanate and subsequent densification by spark plasma sintering (SPS)

Cited by 45 publications

References 37 publications

Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo‐Ferroelectric Materials

Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo‐Ferroelectric Materials

Phase stabilization in plasma sprayed BaTiO3

PTCR characteristics and microstructure of porous (Ba,Sr)TiO3 ceramics prepared by spark plasma sintering

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