AC impedance analysis of LaLiMo2O8 electroceramics

Brahma, Sanjaya; Choudhary, R. N. P.; Thakur, Awalendra K.

doi:10.1016/j.physb.2004.10.091

Cited by 209 publications

(48 citation statements)

References 28 publications

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“…The impedance-frequency trends merge in the high frequency region irrespective of temperature. This may be due to the release of space charges as a result of reduction in the barrier properties of the material with rise in temperature and may be the responsible factor for the enhancement of ac conductivity of the material with temperature at higher frequencies [12,13]. behavior irrespective of temperature [14,15].…”

Section: Ac Impedance Studiesmentioning

confidence: 99%

Synthesis and characterization of B-site doped La 0.20 Sr 0.25 Ca 0.45 TiO 3 as SOFC anode materials

Yaqub

Savaniu

Irvine

2015

International Journal of Hydrogen Energy

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Section: Ac Impedance Studiesmentioning

confidence: 99%

Synthesis and characterization of B-site doped La 0.20 Sr 0.25 Ca 0.45 TiO 3 as SOFC anode materials

Yaqub

Savaniu

Irvine

2015

International Journal of Hydrogen Energy

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“…The CIS technique is based on analyzing the AC response of a system to a sinusoidal perturbation, and subsequent calculation of impedance and related parameters as a function of frequency at different temperatures [28][29][30]. This technique is particularly useful to separate the contributions of (1) bulk, (2) grain boundary and (3) electrode polarizations in the complex impedance and other related parameters along with their equivalent circuits.…”

Section: Impedance Spectrum Analysismentioning

confidence: 99%

Dielectric and impedance spectroscopy of Sr(Bi0.5Ta0.5)O3 electroceramics

Sutar

Choudhary

Das

2014

J Mater Sci: Mater Electron

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Polycrystalline sample of Sr(Bi 0.5 Ta 0.5 )O 3 was prepared by a high-temperature solid-state reaction technique. Preliminary X-ray diffraction analysis confirms the formation of single-phase compound of orthorhombic crystal structure at room temperature. The study of microstructure of gold-coated pellet by scanning electron microscopy shows well-defined and homogeneous distribution of grains on the surface of the sample. The dielectric properties of the compound studied in a wide frequency range (1 kHz-1 MHz) at different temperatures (27-500°C), exhibits that they are temperature dependent. Detailed analysis of impedance spectra showed that the electric properties of the material are strongly dependent on frequency and temperature. Studies of electric modulus show the presence of hopping conduction mechanism in the material with nonexponential type of relaxation. The decrease in value of bulk resistance on increasing temperature suggests the negative temperature co-efficient of resistance behavior of the material. The AC-conductivity spectrum provides a typical-signature of an ionic conducting system, and is found to obey Jonscher's universal power law.

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“…Fig.9 shows the variation of ζ dc against temperature and Fig.10 shows the variation of conductivity against 10 3 / T. The nature of variation is almost linear over a wide temperature region indicating the ohmic nature of contact and conductivity obeys the Arrhenius relationship σ dc = σ o exp (−E a /KT), where E a is the activation energy of conduction and T is the absolute temperature. The nature of variation shows the negative temperature coefficient of resistance (NTCR) behaviour of DAHPT [19]. The low value of activation energy obtained could be attributed to the influence of electronic contribution to the conductivity.…”

Section: Dielectric Analysismentioning

confidence: 95%