Impedance spectroscopy of (Na0.5Bi0.5)(Zr0.25Ti0.75)O3 lead-free ceramic

Lily,; Kumari, Khushboo; Prasad, K.; Choudhary, R. N. P.

doi:10.1016/j.jallcom.2006.11.081

Cited by 235 publications

(70 citation statements)

References 30 publications

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“…Decreasing Z 0 with temperature suggests that the sample follows negative temperature coefficient of resistance (NTCR) at low frequencies, while merging of curves at high frequencies exhibits the possibility of increase in the ac conductivity in the samples, which arises due to the release of space charge and lowering of the potential properties in the samples. 38 This phenomenon can be corroborated with the intrinsic response from grain or bulk in the materials. Relaxation frequency shifts toward higher temperature for the samples sintered at 1150 C. Figure 8 shows the variation of imaginary part of impedance with frequency at different temperatures.…”

Section: Resultsmentioning

confidence: 66%

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

et al. 2017

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We have investigated the structure, dielectric and electrical properties of lead-free polycrystalline (Na 0:47 K 0:47 Li 0:06 ) NbO 3 ceramics as a function of temperature and frequency in order to understand the intrinsic contribution of grain/bulk and grain boundary effects toward the dielectric response as well as the electrical conduction mechanism in the samples fabricated by microwave sintering method. X-ray diffraction analysis exhibits perovskite structure with orthorhombic symmetry, which is well supported by the Raman spectroscopic analysis. A minor secondary impurity phase of tungsten bronze structure was observed for samples sintered at 1050 C, which gets weaker for samples sintered at 1150 C. Dielectric permittivity was enhanced by 50%, although there was a reduction in the dielectric loss by about 50% at Curie temperature (450 C) for samples sintered at 1150 C. Complex impedance spectroscopic analysis indicated non-Debye-type dielectric relaxation present in the samples, and this phenomenon followed thermally activated process related to hopping mechanism. Nyquist plot showed the negative temperature coefficient of resistance, characteristic of the samples.

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Section: Resultsmentioning

confidence: 66%

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

et al. 2017

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“…Conductivity varying at lower frequencies corresponds to space charge polarization [30]. Also, a change in slope has been observed at a particular frequency is related to ion hopping frequency [31][32][33]. This trend represents the conductivity in the present materials for 0.10BNBZT and 0.12BNBZT obeys Jonscher law [34], σ (ω)= σ dc + Aω n (9) where σ dc is frequency independent conductivity, the coefficient A and the frequency exponent n are thermally activated material dependent quantities.…”

Section: Conductivitymentioning

confidence: 98%

Ferroelectric Relaxor Behavior and Spectroscopic Properties of Ba<SUP>2+</SUP> and Zr<SUP>4+</SUP> Modified Sodium Bismuth Titanate

Tilak¹

2012

MATERIALS

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Polycrystalline ceramics (Na 0.5 Bi 0.5 ) 1-x Ba x Zr y Ti 1-y O 3, (BNBZT) (for x=0.10, 0.12; y=0.04), has been synthesized by conventional solid-state sintering. X-ray diffraction analysis indicates the formation of a single phase with tetragonal symmetry with pure perovskite structure. Scanning electron micrograph of the studied materials shows a distribution of grains. A broad dielectric peak with maximum permittivity has been observed near 1200 (for x=0.10, y=0.04) and 1600 (for x=0.12, y=0.04) respectively in the temperature range, RT-600℃. This result indicates that these materials may have great potential for a variety of high temperature applications. These ceramics show diffuse phase transition and the transition temperature shifting toward higher temperature with increasing frequency, which represents the relaxor behvaiour. The relaxor materials obey modified Curie-Weiss law and Vogel-Fulcher relationship. The values of the diffuseness parameter γ=2 for x = 0.10 and 1.67 for x = 0.12, obtained from the fit of a modified Curie-Weiss law established the relaxor type nature. For a more detailed interpretation of the ac data, the complex impedance (Z*) and electric modulus (M*) as a function of frequency f (i.e., 45 Hz-5 MHz) has been simultaneously analysed. Impedance study reveals that there exists a temperature dependent electrical relaxation phenomenon in the materials. Modulus represents hopping of ions and localized motion in studied compositions. Conductivity obey's Jonscher law

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“…The temperature influence on Z re (f ) characteristics almost completely disappear for samples with 0.5 mol.% of lanthanum -the Z re (f ) characteristic for all temperatures merge at high frequency. This is due to the release of space charge as a result of reduction in barrier properties [10,11].…”

Section: Resultsmentioning

confidence: 99%

“…For n = 0, CPE behaves like pure resistance with the value R = 1/A. The CPE element is usually used to explain phenomena on the grain boundary areas [11]. The proposed modification of equivalent circuit led to significant improvement in quality of the fits.…”

Section: Resultsmentioning

confidence: 99%

The analysis of the electrical properties of BLT ceramics fabricated from sol-gel derived powders

et al. 2016

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Abstract. The (BaxLa1−x)Ti 1−x/4 O3 (BLT, 0.001 x 0.005) amorphous gel was prepared by sol-gel process. The electrical properties of obtained materials has been investigated by impedance spectroscopy. Detailed analysis of impedance spectra allowed to propose an adequate equivalent circuit, which described the electric properties of discussed materials very well. Basing on the obtained circuits and the fitting procedure the grain and grain boundary resistivity was determined as a function of temperature and La concentration. With increase of La admixture the contribution of grain and grains impedance to the bulk impedance changes. It was found that the small amount of La additive decreases the blocking factor of the grain boundary in the temperature range 600-850 K, whereas the amount of La on the level of 0.4-0.5 mol.% causes the sharp increase of the mentioned factor. The fact may be attributed to a decrease of grain activation energy and increase of the grain boundary one.

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Impedance spectroscopy of (Na0.5Bi0.5)(Zr0.25Ti0.75)O3 lead-free ceramic

Cited by 235 publications

References 30 publications

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

Ferroelectric Relaxor Behavior and Spectroscopic Properties of Ba<SUP>2+</SUP> and Zr<SUP>4+</SUP> Modified Sodium Bismuth Titanate

The analysis of the electrical properties of BLT ceramics fabricated from sol-gel derived powders

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Impedance spectroscopy of (Na0.5Bi0.5)(Zr0.25Ti0.75)O3 lead-free ceramic

Cited by 235 publications

References 30 publications

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO3 ceramics

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO3 ceramics

Ferroelectric Relaxor Behavior and Spectroscopic Properties of Ba<SUP>2+</SUP> and Zr<SUP>4+</SUP> Modified Sodium Bismuth Titanate

The analysis of the electrical properties of BLT ceramics fabricated from sol-gel derived powders

Contact Info

Product

Resources

About

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics