Effects of temperature moisture and metal salt content
Similarly Lu et al. found that the NaCl content had a significantly positive effect on ε″ of meat batter but also had a significantly negative effects on dielectric heating rate 12. On the
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Structural optical and electrical characterization of
Aug 07 2019 · Thin film of chromium oxide (Cr 2 O 3) having thickness 400 nm was deposited on sapphire substrate by using pulsed laser deposition (PLD) technique.Structural morphological and optical properties of prepared thin film were investigated using x-ray diffraction (XRD) atomic force microscopy (AFM) and UV–vis spectrophotometry.
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Chromium(III) oxideWikipedia
Chromium (III) oxide is a precursor to the magnetic pigment chromium dioxide by the following reaction Cr. 2O. 3 3 CrO. 3 → 5 CrO. 2 O. 2. Along with many other oxides it is used as a compound when polishing (also called stropping) the edges of knives razors surfaces of optical devices etc. on a piece of leather balsa cloth or
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The effect of Cr2O3 Nb2O5 and ZrO2 doping on the
Feb 29 2008 · It is shown that the dielectric constant of both undoped and doped CCTO was nearly temperature-independent up to approximately 400 K at 10 kHz except for a small increase in the Nb 2 O 5-doped sample at high temperatures.The highest dielectric constant was obtained from Cr 2 O 3-doped CCTO over entire temperature range while the overall variation of the dielectric constant (ΔK / K)
Get Price(PDF) Crystallographic Evolution Dielectric and
The excellent piezoelectric and dielectric prop- erties coupled with high Curie temperature demonstrated that the Bi4Ti2.975W0.025O12.02510.2 wt Cr2O3 (x 5 0.025) ceramics are promising candidates for high-temperature applications.
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Investigation of Annealing Temperature on Structural and
Jun 20 2017 · Cr2O3 nanoparticles have been prepared for precipitation technique at reaction temperature 50 °C. The prepared samples were annealed different temperatures at 500 700 and 1000 °C. Synthesized powders were characterized as X-ray diffraction optical transmission electron microscope SEM with EDAX humidity sensor FTIR. The annealing temperature has been found to
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Effect of Cr2O3 content on high-temperature dielectric
Apr 24 2019 · Effect of Cr 2 O 3 content on high-temperature dielectric properties and crystallisation of CMAS glass-ceramics. Yajing Han 1 Xiaolin Jia 2 Fang Liu 2 Rezvani M et al 2005 Effect of Cr2O3 Fe2O3 and TiO2 nucleants on the crystallization behaviour of SiO2-Al2O3-CaO-MgO(R2O)glass-ceramics J Ceram Int. 31 75–80.
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High temperature dielectric study of Cr2O3 in microwave region
In order to study the high temperature dielectric behavior of materials in the gigahertz region a technique was devel-oped earlier.9 10 Using this technique the changes in the complex permittivity of chromium oxide at 3.5 GHz up to a temperature around 1100
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Structural optical and electrical characterization of
Aug 07 2019 · Thin film of chromium oxide (Cr 2 O 3) having thickness 400 nm was deposited on sapphire substrate by using pulsed laser deposition (PLD) technique.Structural morphological and optical properties of prepared thin film were investigated using x-ray diffraction (XRD) atomic force microscopy (AFM) and UV–vis spectrophotometry.
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Making Sense of Laminate Dielectric Properties
A typical high Tg laminate data sheet states the "typical" electrical properties (Dk and Df) at 1 MHz1 GHz for one resin content. For high speed digital substrates a data sheet will provide "typical" (not exact frequencies) data points for 2 5 and 10 GHz for one resin content.
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Effect of ZTA concentration on structural thermal
Zirconia toughened alumina (ZTA) nanopowder was synthesized by solution combustion technique. Polymer nanocomposites were prepared using ZTA nanopowder as the reinforcement and polyvinyl alcohol (PVA) as the matrix. ZTA nanopowder composition was varied from 0 to 2.5 by weight. Structural characterization was done using scanning electron microscope (SEM) and X-ray diffraction
Get PriceHigh dielectric constant oxidesStanford University
J. Robertson High dielectric constant oxides 267 Fig. 4. The three contributions to the capacitance of the gate/electrode stack channel dielectric and gate depletion. refreshed. The capacitor must retain charge during this time so the leakage current density through the capacitor mustbebelow10−7 A/cm2 lowerthan for gate dielectrics in
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Effect of Cr 2 O 3 content on high-temperature dielectric
Jul 01 2019 · CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glass-ceramics were prepared using fly ash and Bayan Obo West Mine tailings as the main raw materials by microwave heating. The effects of Cr 2 O 3 content on the structure and properties of the glass-ceramics were investigated by differential thermal analysis x-ray diffraction scanning electron microscopy and physical and dielectric property analysis.
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(PDF) Effects of Moisture Content and Temperature on the
In this research the effects on moi sture content and temperature on the dielectric strength and chemical compounds of mineral insulating oil were analyzed . The d ielectric strength (i.e. breakdown
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Effects of core/shell volumetric ratio on the dielectric
desired dielectric-temperature characteristics. The effects of various kinds and amounts of additives have been studied 2 4 5 9 10 15–22 including in particular those of rare earth elements with intermediate ionic radii (Dy Ho Y and Er) 9 10 19–23 . In the case of rare earth doping high insulation resistance can be
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Effects of Ti content on dielectric and energy storage
With increasing Ti content both the forward and backward phase transition fields would decrease. When x=0.16 the dielectrics would be under FE state at room temperature (22∘C) and the phase transition from FE to AFE and then to paraelectric (PE) was observed with temperature rise.
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Effect of ZTA concentration on structural thermal
Zirconia toughened alumina (ZTA) nanopowder was synthesized by solution combustion technique. Polymer nanocomposites were prepared using ZTA nanopowder as the reinforcement and polyvinyl alcohol (PVA) as the matrix. ZTA nanopowder composition was varied from 0 to 2.5 by weight. Structural characterization was done using scanning electron microscope (SEM) and X-ray diffraction
Get PriceInfluence of Cr Valence State on Dielectric-Temperature
For Barium Titanate Ceramics doped with the trivalent and hexavalent chromium oxides the influence of Cr valence state on dielectric-temperature stability was investigated with Atomic force microscopy X-ray diffraction Raman spectroscopy and dielectric measurements. The application of the trivalent Cr2O3 dopant can give rise to a temperature-stable X7R specification and a lower dielectric
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Effects of Ti content on dielectric and energy storage
With increasing Ti content both the forward and backward phase transition fields would decrease. When x=0.16 the dielectrics would be under FE state at room temperature (22∘C) and the phase transition from FE to AFE and then to paraelectric (PE) was observed with temperature rise.
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High temperature dielectric study of Cr2O3 in microwave
Mar 23 2007 · In the temperature range of measurement the dielectric constant is found to increase within 10 and loss factor within one and a half times the room temperature values. Results are discussed in the light of agitated ionic motion in the material.
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Varistor and dielectric properties of Cr2O3 doped SnO2
Dec 01 2014 · With increasing Cr2 O 3 content the breakdown electrical field EB increases from 11 to 92 V/mm and the relative dielectric constant εr measured at 1
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Magnetoelectric Hysteresis Loops in Cr2O3 at Room Temperature
We revisit the room-temperature linear magnetoelectric effect in Cr2O3 single crystals. It was found that the temperature dependence of dielectric constants in a magnetic field H shows a λ-shaped
Get PriceOptical Response of High-Dielectric-Constant Perovskite
Jul 27 2001 · Optical conductivity measurements on the perovskite-related oxide CaCu3Ti4O12 provide a hint of the physics underlying the observed giant dielectric effect in this material. A low-frequency vibration displays anomalous behavior implying that there is a redistribution of charge within the unit cell at low temperature. At infrared frequencies (terahertz) the value for the dielectric constant
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The effect of Cr2O3 Nb2O5 and ZrO2 doping on the
The substitution of the aliovalent dopant Cr2O3 on the Ti site was investigated in terms of the effects on the dielectric properties at doping levels ranging from 0.1 to 1.0 .
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Structural dielectric and magnetic properties of nickel
The dispersion behavior of the dielectric constant with frequency and the semicircle nature of the impedance spectra show the cobalt nickel ferrite to have high resistance. The ferromagnetic nature is observed in all the samples however the maximum saturation magnetization was achieved by the 0.4 Ni substituted cobalt ferrite which is up to
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Structural and optical characterization of Cr2O3
Feb 25 2014 · The structural optical and dielectric properties of as-grown Cr 2 O 3 nanostructures are demonstrated in this paper. Powder X-ray diffractometry analysis confirmed the rhombohedral structure of the material with lattice parameter a = b = 4.953 Å c = 13.578 Å and average crystallize size (62.40 ± 21.3) nm. FE-SEM image illustrated the mixture of different shapes (disk particle and rod
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(PDF) Effects of Cr2O3 on structural dielectric and
Effects of Cr2O3 on structural dielectric and electrical properties of (Pb0.95Sr0.05)(Zr 0.53Ti0.47)O3 ceramics September 2009 International Journal of Modern Physics B 23(24)
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The effect of Cr2O3 Nb2O5 and ZrO2 doping on the
Feb 29 2008 · It is shown that the dielectric constant of both undoped and doped CCTO was nearly temperature-independent up to approximately 400 K at 10 kHz except for a small increase in the Nb 2 O 5-doped sample at high temperatures.The highest dielectric constant was obtained from Cr 2 O 3-doped CCTO over entire temperature range while the overall variation of the dielectric constant (ΔK / K)
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Thermal effects on materialsUPM
Classification by temperature range • Cryogenic effects (superconductivity superfluidity) • Mid-temperature effects • High-temperature effects (dissociation ionisation) Classification by purpose of its study (study target) • To know the effects (e.g. expansion melting decomposition)
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