High-temperature complex impedance and modulus spectroscopic studies of doped Na0.5Bi0.5TiO3-BaTiO3 ferroelectric ceramics

Devi, Ch. Sameera; Suresh, M. Buchi; Kumar, G. S.; Prasad, G.

doi:10.1007/s11581-016-1781-3

Cited by 6 publications

(2 citation statements)

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“…[12,26] As the doping rate increases and beyond x = 7 %, the maximum of Z'' max shifts to higher frequencies, suggesting a lower relaxation time. Furthermore, Ch Sameera Devi et al [7,27] suggest that this behaviour is attributed to the space charge effect. Indeed, the relaxation frequency (f max = 1/τ) depends on both the temperature and the composition of xBT.…”

Section: Variation Of Imaginary Part Of Impedance (Z'') With Frequencymentioning

confidence: 99%

“…Due to its high conductivity, NBT is considered a very good conductor of oxide ions for industrial uses in sensor devices and electrochemistry [6]. However, for ferroelectric and energy storage applications, this conductivity is perceived as a constraint [7]. Many studies have investigated rare earth-doped NBT products to solve these problems [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Impedance spectroscopy and permittivity study of (1-x)NBT-xBT ceramics

Mesrar¹

2022

Ceramics - Silikaty

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The complex impedance spectroscopy method was applied to evaluate the profound characteristics of the electrical transport capacity of lead-free ferroelectric ceramic solid solutions of (1-x)(Na 0.5 Bi 0.5 )TiO 3-x Ba TiO 3 (NBT-xBT) (0.00 ≤ x ≤ 0.10). The elaboration of NBT-xBT, via a solid-state reaction between (Na 0.5 Bi 0.5 )TiO 3 and BaTiO 3 , was determined using X-ray diffraction. Refinements, at room temperature, identified a rhombohedral phase, space group R3c for x = 0.0 and 0.03, which possesses an antiphase, corresponding to the tilting system ā ā ā with an angle of inclination of 8.24° according to Glazer's notation. We used the complex impedance, complex electric Cole-Cole diagram and frequency-dependent AC conductivity analysis to examine the relaxation and conduction mechanism in these samples, which exhibit non-Debye type behaviour. In addition, using an equivalent circuit composed of resistance and capacitance, we examined the different contributions (grains and grain boundaries) in our samples. (Na 0.5 Bi 0.5 )TiO 3 exhibits a dielectric resonance, which manifests itself as negative permittivity. The resonance development of NBT-xBT in the range (500 Hz − 2 MHz) is discussed in this paper.

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Section: Variation Of Imaginary Part Of Impedance (Z'') With Frequencymentioning

confidence: 99%