Dielectric Constant and Dielectric Loss of Ti<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(Rutile) at Low Frequencies

Parker, Rebecca; Wasilik, John H.

doi:10.1103/physrev.120.1631

Cited by 65 publications

(40 citation statements)

References 9 publications

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“…This is a dominant mechanism at low frequencies in low Fe content (54 mole%) samples. Second contribution is due to the separation of free charges existing in the samples, where the charge carriers accumulate at the crystallite surface near the electrodes and impart polarisation to the sample in a manner similar to that reported by Parker and Wasilik [25] in single-crystal rutile samples. This mechanism is thought to be operative in all the samples to different extent.…”

Section: Dielectric Studiesmentioning

confidence: 73%

“…The numerical value of dielectric loss at frequency 4100 kHz is less than one in all the samples which is further reduced by at least one order of magnitude for higher Fe content samples which are found to be in rutile phase. The reported value of dielectric constant for bulk TiO 2 is 117-166 for anatase phase [24], whereas the rutile phase single-crystal material exhibits anisotropic behaviour with dielectric constant along c-axis as 166 and 89 perpendicular to c-axis [25]. Similar values have been reported for microcrystalline and nanocrystalline materials prepared by spark plasma process [26,27], whereas large variation in the value of "r for thin-film samples has been reported (from 60 to 1) [28,29].…”

Section: Dielectric Studiesmentioning

confidence: 99%

“…Little variation in free carrier concentration with increased Fe content causes a very small variation in the high frequency value of the dielectric constant. Parker and Wasilik [25] have studied the dielectric constant of single-crystal samples and suggested the separation of charge carriers at the opposite electrodes. Creation of charge carrier in TiO 2 due to oxygen vacancies in the doped TiO 2 samples has been reported by the several researchers [27][28][29][30].…”

Section: Dielectric Studiesmentioning

confidence: 99%

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Dielectric properties of Fe-doped TiO₂nanoparticles synthesised by sol–gel route

Singh

Yadav

Singh

et al. 2013

Journal of Experimental Nanoscience

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Fe-doped nanocrystalline samples of titanium oxide have been synthesised by sol-gel route and conventional sintering process at 450 C under atmospheric conditions. These samples are characterised by X-ray diffraction (XRD), X-ray photoelectron spectroscopy, transmission electron microscopy (TEM) and dielectric property measurement. Samples with Fe content more than 4 mole% crystallises in rutile phase and those with less than 4 mole% crystallises in anatase phase. Nanocrystallite size has been controlled by Fe doping. Crystallite size was found to decrease with Fe concentration in the anatase phase samples whereas reverse happens in rutile phase samples of titanium oxide. There is a slight variation in numerical values of crystallite sizes measured by the two techniques: TEM and XRD peak broadening. The highest crystallite size was 86 nm in 10 mole% Fe-doped samples and the lowest 20 nm in 4 mole% Fe-doped sample. Large dispersions and anomalous values of the dielectric constant, "r were observed at low frequency in anatase phase samples. Rutile phase samples exhibit little dispersion over the measurement frequency range of 20 Hz to 10 MHz. The dielectric constant value of all the samples stabilises to a constant value at higher frequencies. This value is dependent on the final crystalline phase but independent of the crystallite size. The anomalous dielectric behaviour of anatase samples at low frequencies is assigned to the adsorbed -OH ions on the sample surface.

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Section: Dielectric Studiesmentioning

confidence: 73%

Section: Dielectric Studiesmentioning

confidence: 99%

Section: Dielectric Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric properties of Fe-doped TiO₂nanoparticles synthesised by sol–gel route

Singh

Yadav

Singh

et al. 2013

Journal of Experimental Nanoscience

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“…13,14 However, TiO 2 thin films grown by both physical vapor deposition and chemical vapor deposition usually have anatase or amorphous structures, which only have a moderately high dielectric constant ͑ ϳ 20-40͒. 15 High temperature annealing ͑above 700°C͒ is necessary to transform them to the rutile phase, which requires high thermal budgets and causes structural integrity problems.…”

mentioning

confidence: 99%

Low Temperature Epitaxial Growth of High Permittivity Rutile TiO[sub 2] on SnO[sub 2]

Wang

Gordon

2010

Electrochem. Solid-State Lett.

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“…Grant [7] quotes values for the static dielectric constant at room temperature of 173 in the c -direction and 89 perpendicular to the c -direction, compared with the optical value of ∼7. Dielectric constant and dielectric loss of TiO 2 (rutile) at low frequencies was also calculated by Parker and Wasilik [8] where as dielectric relaxational behaviour was observed by Dominik and Mac Crone [9] in reduced rutile. Those studies mainly deal with the measurement of dielectric constant for low and high frequency at room temperature or below the room temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Content on Dielectric Properties of Float Zone Grown Titanium Dioxide (TiO₂) Crystal

et al. 2008

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Dielectric studies have been carried out to see the effect of oxygen content on two different sets of rutile (TiO 2 ) single crystals grown by float zone technique. One set is having pale yellow colour which is the correct characteristic colour of rutile crystals whereas another have dark blue colour which contains oxygen deficiency. The variation of dielectric constant (ε ), the dielectric loss (tan δ) and the electric conductivity (σ ) at different temperature and frequency of the applied electric field was studied for both these crystals. There is significant change in the values of dielectric constant for blue sample as compared to yellow sample. The dielectric constant in most of the region for oxygen deficient crystal (blue colour) is large as compared to true stiochoimetric ratio (pale yellow) of the rutile crystal. Based on conductivity behaviour, it was found that the correlated barrier hopping (CBH) model is the most predominant hopping mechanism in the case of the yellow crystal, whereas in the case of the blue crystal, hopping may be due to overlap of large polarons.

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Dielectric Constant and Dielectric Loss of TiO2(Rutile) at Low Frequencies

Cited by 65 publications

References 9 publications

Dielectric properties of Fe-doped TiO₂nanoparticles synthesised by sol–gel route

Dielectric properties of Fe-doped TiO₂nanoparticles synthesised by sol–gel route

Low Temperature Epitaxial Growth of High Permittivity Rutile TiO[sub 2] on SnO[sub 2]

Effect of Oxygen Content on Dielectric Properties of Float Zone Grown Titanium Dioxide (TiO₂) Crystal

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Dielectric Constant and Dielectric Loss of TiO2(Rutile) at Low Frequencies

Cited by 65 publications

References 9 publications

Dielectric properties of Fe-doped TiO2nanoparticles synthesised by sol–gel route

Dielectric properties of Fe-doped TiO2nanoparticles synthesised by sol–gel route

Low Temperature Epitaxial Growth of High Permittivity Rutile TiO[sub 2] on SnO[sub 2]

Effect of Oxygen Content on Dielectric Properties of Float Zone Grown Titanium Dioxide (TiO2) Crystal

Contact Info

Product

Resources

About

Dielectric properties of Fe-doped TiO₂nanoparticles synthesised by sol–gel route

Dielectric properties of Fe-doped TiO₂nanoparticles synthesised by sol–gel route

Effect of Oxygen Content on Dielectric Properties of Float Zone Grown Titanium Dioxide (TiO₂) Crystal