Electrical properties of Li1+xYyTi2−y(PO4)3 (where x,y=0.3; 0.4) ceramics at high frequencies

Sobiestianskas, R.; Dindune, A.; Kanepe, Z.; Ronis, J.; Kežionis, A.; Kazakevičius, E.; Орлюкас, А.Ф.

doi:10.1016/s0921-5107(00)00437-2

Cited by 43 publications

(26 citation statements)

References 14 publications

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“…The high-frequency part of the obtained spectra may be attributed to the relaxation in grain boundaries, while the lower-frequency part corresponds to processes related to interfaces between the Pt electrodes and the superionic material. The dispersion related to ionic processes in grains is usually observed at high frequencies and temperatures up to about 500 K [12,[24][25][26]. In our case this dispersion region was not measured due to the low ionic conductivity of the investigated ceramics.…”

Section: Resultsmentioning

confidence: 53%

“…Different sintering time of the ion conductive ceramics mainly affects the amount of grain boundaries due to grain growth and consequently their contribution to the electrical conductivity [12,24,25,27]. The results of the measurements of electrical parameters at 600 K for Li 1/3 Ce 2/3 PO 4 and LiCe 2/3 PO 4 ceramics sintered for different t s are presented in table 6.…”

Section: Resultsmentioning

confidence: 99%

“…The measurements of complex conductivity (σ = σ + iσ ), complex impedance (Z = Z + iZ ) and complex dielectric permittivity (ε = ε − iε ) were performed in the temperature range from 300 to 650 K in the frequency range from 50 to 10 6 Hz using an LCR meter (HP 4284A) and in the frequency range from 10 6 to 1.2 × 10 9 Hz by using a coaxial impedance spectrometer set-up [12].…”

Section: Methodsmentioning

confidence: 99%

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Synthesis and characterization of Li_1/3Ce_2/3PO₄and LiCe_2/3PO₄ceramics

Салкус¹,

Kežionis²,

Dindune³

et al. 2007

J. Phys.: Condens. Matter

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Li 1/3 Ce 2/3 PO 4 and LiCe 2/3 PO 4 compounds were synthesized by a solid state reaction and studied by x-ray diffraction and thermogravimetric analysis. At room temperature the investigated compounds exhibit monoclinic symmetry (space group P2 1 /n) with four formula units in the lattice. The compounds are stable up to 1200 K in air and show no weight loss. The ceramic samples were fabricated with varying sintering times. The surfaces of the ceramics were studied by scanning electron microscopy. The increase of sintering time of the ceramics leads to an increase of the grain size of the materials. The results of an x-ray photoelectron spectroscopy study have shown that the external electric field changes the Li amount on the surfaces of the ceramic samples. The electric properties of the samples were investigated by complex impedance spectroscopy in the frequency range from 50 to 1.2 × 10 9 Hz in the temperature range from 300 to 650 K. Varying the sintering time of the ceramics affects the values of the total conductivity, activation energy, dielectric permittivity and dielectric losses of the ceramics.

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Synthesis and characterization of Li_1/3Ce_2/3PO₄and LiCe_2/3PO₄ceramics

Салкус¹,

Kežionis²,

Dindune³

et al. 2007

J. Phys.: Condens. Matter

Self Cite

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“…The high frequency region of dispersions may be attributed to the relaxation processes in the bulk, while lower frequency part corresponds to grain boundary processes in the same way as in a wide range of other solid electrolyte ceramics [8][9][10][11][12]. Ionic conductivities at different temperatures were derived from impedance and conductivity spectra of the thin films using the nonlinear least squares fitting procedures.…”

Section: Resultsmentioning

confidence: 99%

Ionic conductivity of e-beam deposited yttrium stabilized zirconia thin films

Laukaitis¹

2007

Lithuanian J. Phys.

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In the present study yttrium stabilized zirconia (YSZ) thin films were deposited on the Alloy-600 and optical quartz substrates using e-beam deposition technique with controlled deposition parameters: substrate temperature (Ts) and electron gun power (P ) influencing the thin film deposition mechanism. The dependence of these parameters on thin film ionic conductivity, structure, and surface morphology was investigated by X-ray diffraction and scanning electron microscopy (SEM). It was found that electron gun power has the influence on the crystallite size, texture, and roughness of YSZ films. Dominating dispersion in the deposited YSZ thin films (substrate temperature T = 250• C, e-beam gun power P = 0.9 kW) relates to ionic transport in the crystallites in the measured frequency and temperature ranges. The measured values of conductivity and its activation energies are those typical of the polycrystalic ZrO2-8 mol% Y2O3 compound. The conductivity values of crystallites of YSZ thin films and ceramics are similar. Differences are found only in thin films deposited at T = 250• C and P = 0.66 kW.

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“…Impedance of the sampleZ(f ) = Z − iZ , specific impedance of the materialρ =ZS/l (where S is the area of the electrode, l is the length of the sample), and complex conductivityσ(f ) = σ + iσ = 1/ρ were calculated fromT as described in [10][11][12]. The measurements of electrical parameters were performed in the temperature range 450-700 K. The temperature of the sample was measured by a K-type thermocouple.…”

Section: Methodsmentioning

confidence: 99%

XPS and impedance spectroscopy of Gd doped CeO₂superionic ceramics

Салкус¹,

Venckutė²,

Kazakevičius³

et al. 2009

Lithuanian J. Phys.

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Ce0.9Gd0.1O1.95 (CGO-10) and Ce0.8Gd0.2O1.9 (CGO-20) ceramics have been sintered by using commercial powders of Fuel Cell Materials company. The powders of different surface area (BET [m 2 /g]) were used to prepare the ceramics. Elemental compositions of CGO solid electrolytes' surfaces have been investigated in 10 −7 Pa vacuum by X-ray photoelectron spectroscopy and the ratio Ce 4+ /Ce 3+ has been estimated. Electrical parameters of CGO ceramics were investigated in the frequency range from 1 MHz to 1.2 GHz. Temperature-dependant bulk ionic conductivity (σ b ) was found to follow the Arrhenius law. Ionic conductivity of CGO-10 was higher compared to that of CGO-20. The bulk ionic conductivity of CGO-10 ceramics slightly depended on the grain size of initial powder.

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Electrical properties of Li1+xYyTi2−y(PO4)3 (where x,y=0.3; 0.4) ceramics at high frequencies

Cited by 43 publications

References 14 publications

Synthesis and characterization of Li_1/3Ce_2/3PO₄and LiCe_2/3PO₄ceramics

Synthesis and characterization of Li_1/3Ce_2/3PO₄and LiCe_2/3PO₄ceramics

Ionic conductivity of e-beam deposited yttrium stabilized zirconia thin films

XPS and impedance spectroscopy of Gd doped CeO₂superionic ceramics

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Electrical properties of Li1+xYyTi2−y(PO4)3 (where x,y=0.3; 0.4) ceramics at high frequencies

Cited by 43 publications

References 14 publications

Synthesis and characterization of Li1/3Ce2/3PO4and LiCe2/3PO4ceramics

Synthesis and characterization of Li1/3Ce2/3PO4and LiCe2/3PO4ceramics

Ionic conductivity of e-beam deposited yttrium stabilized zirconia thin films

XPS and impedance spectroscopy of Gd doped CeO2superionic ceramics

Contact Info

Product

Resources

About

Synthesis and characterization of Li_1/3Ce_2/3PO₄and LiCe_2/3PO₄ceramics

Synthesis and characterization of Li_1/3Ce_2/3PO₄and LiCe_2/3PO₄ceramics

XPS and impedance spectroscopy of Gd doped CeO₂superionic ceramics