Influence of chemical composition on dielectric properties of Al2O3 and ZrO2 plasma deposits

Ctibor, Pavel; Sedláček, Josef; Neufuss, K.

doi:10.1016/s0272-8842(02)00197-9

Cited by 21 publications

(14 citation statements)

References 15 publications

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“…Up to 1 MHz relative permittivity is probably further less dependent on spraying distance and becomes the same value as sintered calcium titanate. It indicates that in the case of as-sprayed deposits plays a role some polarization mechanism, which is associated with features regulated by spraying distance [14]. This mechanism does not disappear completely below 1 MHz.…”

Section: Description Of the Electric Measurementsmentioning

confidence: 87%

“…Regarding CaTiO 3 neither chemical nor phase changes were observed after spraying [5,14]. Therefore probably a feature of grain boundaries, at the present time not well understood, is allowed to be responsible for relaxation effects.…”

Section: Catiomentioning

confidence: 99%

“…Applied voltage was 1 V AC; the stabilized electric source was equipped with a micrometric capacitor as recommended in the relevant standard [13]. Relative permittivity e r was calculated from measured capacities and specimen dimensions [14]. This same LCR-meter (PM 6306) was used for the loss factor measurement.…”

Section: Description Of the Electric Measurementsmentioning

confidence: 99%

“…Applied voltage was 100AE 2V DC. Volume resistivity was calculated from the measured resistance and specimen dimensions [14]. The values (in the text denoted as ''sample'') are from an average of 3-6 specimens.…”

Section: Description Of the Electric Measurementsmentioning

confidence: 99%

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Dielectric relaxation in calcium titanate-containing ceramics prepared by plasma spraying

Ctibor

Sedláček

Neufuss

et al. 2003

Ceramics International

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The relative permittivity and loss factor frequency dependence in a weak electric field of plasma sprayed perovskite and ilminite polycrystalline ceramic materials-pure synthetic calcium titanate, as well as magnesium titanate-calcium titanate mixture, were studied. It was observed that plasma-sprayed titanates exhibit a strong relaxation of permittivity and loss factor decrease when they are measured in an as-sprayed state. The frequency dependence of the earlier properties is influenced by chemical composition and spraying parameters, but the relaxation character in general is preserved in all cases. The volume resistivity of the samples in an assprayed as well as subsequently annealed state was studied also. Several aspects of the structural features of plasma deposits and their possible influence on dielectric properties are discussed. #

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Section: Description Of the Electric Measurementsmentioning

confidence: 87%

Section: Catiomentioning

confidence: 99%

Section: Description Of the Electric Measurementsmentioning

confidence: 99%

Section: Description Of the Electric Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Dielectric relaxation in calcium titanate-containing ceramics prepared by plasma spraying

Ctibor

Sedláček

Neufuss

et al. 2003

Ceramics International

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, improving the corrosion resistance of superalloy substrates, such as gas-turbine blades, has been a very distinct line of research and publication (Ref [13][14][15]. Besides this, the high electrical resistivity of these coatings has been exploited to achieve insulating coatings for use in electronics (Ref [16][17][18][19].…”

Section: Metal Oxide Passive Layersmentioning

confidence: 99%

Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review

Gardon

Guilemany

2014

J Therm Spray Tech

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Titanium dioxide has been the most investigated metal oxide due to its outstanding performance in a wide range of applications, chemical stability and low cost. Coating processes that can produce surfaces based on this material have been deeply studied. Nevertheless, the necessity of coating large areas by means of rapid manufacturing processes renders laboratory-scale techniques unsuitable, leading to a noteworthy interest from the thermal spray (TS) community in the development of significant intellectual property and a large number of scientific publications. This review unravels the relationship between titanium dioxide and TS technologies with the aim of providing detailed information related to the most significant achievements, lack of knowhow, and performance of TS TiO 2 functional coatings in photocatalytic, biomedical, and other applications. The influence of thermally activated techniques such as atmospheric plasma spray and high-velocity oxygen fuel spray on TiO 2 feedstock based on powders and suspensions is revised; the influence of spraying parameters on the microstructural and compositional changes and the final active behavior of the coating have been analyzed. Recent findings on titanium dioxide coatings deposited by cold gas spray and the capacity of this technology to prevent loss of the nanostructured anatase metastable phase are also reviewed.

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The Role of Surface Chemistry at Ceramic/Electrolyte Interfaces in the Generation of Pulsed Corona Discharges in Water Using Porous Ceramic‐Coated Rod Electrodes

Lukeš

Člupek

Babický

et al. 2009

Plasma Processes & Polymers

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Effects associated with the electrical breakdown of water using porous ceramic‐coated rod electrodes were investigated for two types of ceramics, oxide (corundum) and silicates (almandine). Properties of the ceramic layer and its interaction with the electrolyte were found as important factors in the generation of electrical discharges in water. Initiation of the discharge depended not only on the permittivity and porosity of the ceramic, but also the surface charge formed on the ceramic, which was determined by the polarity of the applied voltage, and the pH and chemical composition of aqueous solution. An electrical double layer associated with the buildup of surface charge at ceramic/electrolyte interface affected the electric field distribution on the ceramic electrode. Using monopolar high voltage pulses, this layer became polarized, which, under certain experimental conditions, eventually quenched the electrical discharge in water. Applying bipolar pulses eliminated these effects.

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Influence of chemical composition on dielectric properties of Al2O3 and ZrO2 plasma deposits

Cited by 21 publications

References 15 publications

Dielectric relaxation in calcium titanate-containing ceramics prepared by plasma spraying

Dielectric relaxation in calcium titanate-containing ceramics prepared by plasma spraying

Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review

The Role of Surface Chemistry at Ceramic/Electrolyte Interfaces in the Generation of Pulsed Corona Discharges in Water Using Porous Ceramic‐Coated Rod Electrodes

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