Impedance spectroscopy study of NaBa2V5O15 ceramic

Behera, Banarji; Nayak, P.; Choudhary, R. N. P.

doi:10.1016/j.jallcom.2006.07.028

Cited by 271 publications

(74 citation statements)

References 20 publications

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“…present at low temperature and defects created at high temperature [28]. Finally, all the curves for Z" merge at high frequency due to the accumulation of space charge.…”

Section: M′mentioning

confidence: 92%

Complex impedance properties of LiSr2Nb5O15 ceramic

et al. 2012

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Abstract:The polycrystalline sample of LiSr 2 Nb 5 O 15 (LSN) was prepared by a high-temperature solid state reaction technique. The impedance parameters were studied using an impedance analyzer in a wide range of frequencies (10 2 -10 6 Hz) at different temperatures (28-500 ℃). Nyquist plot reveals the presence of bulk effect only. The bulk resistance of the compound decreases with rise in temperature which shows the negative temperature coefficient of resistance (NTCR) like a semiconductor. The ac conductivity spectrum was found to obey Jonscher's universal power law. DC conductivity (bulk) with temperature demonstrates that the compound exhibits Arrhenius type of electrical conductivity and the activation energy found to be 0.97 eV.

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“…present at low temperature and defects created at high temperature [28]. Finally, all the curves for Z" merge at high frequency due to the accumulation of space charge.…”

Section: M′mentioning

confidence: 92%

Complex impedance properties of LiSr2Nb5O15 ceramic

et al. 2012

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“…This behavior indicates an increase in conduction with temperature and frequency. The lower value of Z  at region III at various SM T indicates a possible release of space charge and a consequent lowering of the energy barrier properties [16][17][18]. At higher frequency, the space charge has less time to relax and the recombination would be faster [19].…”

Section: Complex Impedance Analysismentioning

confidence: 98%

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

2015

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Abstract:The electrical properties of Ni 0.27 Cu 0.10 Zn 0.63 Fe 2 O 4 (NCZF) prepared from auto combustion synthesis of ferrite powders have been studied by impedance and modulus spectroscopy. We studied frequency and temperature dependencies of impedance and electric modulus of NCZF in a wide frequency range (20 Hz-5 MHz) at different measuring temperatures SM T (30-225 ℃). The complex impedance spectra clearly showed both grain and grain boundary effects on the electrical properties. The observed impedance spectra indicated that the magnitude of grain boundary resistance gb R becomes more prominent compared to grain resistance b R at room temperature, and with the increase in SM T , gb R decreases faster than the intrinsic b R . The frequency response of the imaginary part of impedance showed relaxation behavior at every SM T , and the relaxation frequency variation with SM T appeared to be of Arrhenius nature and the activation energy has been estimated to be 0.37 eV. A complex modulus spectrum was used to understand the mechanism of the electrical transport process, which indicated that a non-Debye type of conductivity relaxation characterizes this material.

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“…The activation energy calculated from the slope of straight line is found to be 0.12 eV. The value of activation energy is found to be very less as compared to other TB and perovskite structure compounds [20][21][22]. This suggests that a small amount of energy is required to activate the electrons for electrical conduction.…”

Section: DC Conductivitymentioning

confidence: 83%

Impedance spectroscopy study of Na2SmV5O15 ceramics

et al. 2014

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Abstract:The polycrystalline Na 2 SmV 5 O 15 (NSV), a new member of the tungsten bronze (TB) family, was prepared by a mixed-oxide technique. The room-temperature X-ray diffraction (XRD) confirmed the formation of single phase compound with orthorhombic crystal structure. The scanning electron microscopy (SEM) analysis indicated that the compound has homogeneous micrograph with a uniform distribution of small grains over the entire surface of the sample. The analysis of impedance spectra of NSV in a low-temperature range (100 ℃ to 100 ℃) at different frequencies exhibited interesting electrical properties like the contribution of bulk effect in conduction process. The study of imaginary part of the impedance at different temperatures showed existence of relaxation peak with its shift towards higher frequency on increasing temperature. This suggested the presence of frequency and temperature dependent relaxation process in the material. The loss peak spectra were found to abide by Arrhenius law with small activation energy of 0.12 eV. The temperature dependence of AC and DC electrical conductivity ( AC  and DC  ) was also obtained.

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Impedance spectroscopy study of NaBa2V5O15 ceramic

Cited by 271 publications

References 20 publications

Complex impedance properties of LiSr2Nb5O15 ceramic

Complex impedance properties of LiSr2Nb5O15 ceramic

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

Impedance spectroscopy study of Na2SmV5O15 ceramics

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