Impedance and Modulus Spectroscopy Characterization of Tb modified Bi0.8A0.1Pb0.1Fe0.9Ti0.1O3 Ceramics

Thakur, Shweta; Rai, Radheshyam; Bdikin, Igor; Valente, M.A.

doi:10.1590/1980-5373-mr-2015-0504

Cited by 137 publications

(65 citation statements)

References 36 publications

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“…30,31 Two peaks in graph confirm the coexistence of two systems. 20 The complex electric modulus spectrum M 0 versus M 00 for the sample is shown in Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

“…The observed peaks in the dielectric constant can be correlated to the two phase transitions from Ferro to Ferro (T 1 ) and ferroelectric to paraelectric (T 2 ) at temperatures 175 C and 320 C, respectively. 20 These two peaks are due to three different types of ferroelectric compounds present in the system. 21 These two peaks are due to different phase transitions of BiFeO 3 and BaTiO 3 and the dielectric peak is shifted towards the low-temperature side on the increasing frequency.…”

Section: Introductionmentioning

confidence: 99%

“…These type of two peaks has been observed in samples due to the high percentage of dopant ion (>5%). [20][21][22][23][24] With the increase in temperature, the dielectric constant rises up to 170 C and then decreases up to 235 C. After 235 C, dielectric constant increases again up to 320 C. The two maximum values of dielectric constant (" 1 max : and " 2 max : ) with two transition temperatures at different frequencies (1-100 kHz) are shown in Table 1. Figure 3 shows the variation of log ac (s=m) versus 1/T (K À1 ) of BTBFT ceramics at 1-100 kHz frequencies in the temperature range from 325 C to 345 C. The ac electrical conductivity was obtained from the impedance data using the formula ¼ !""…”

Section: Introductionmentioning

confidence: 99%

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Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O₃ perovskite compound

2017

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This work focuses on the structural, electrical and magnetic properties of Bi 0:8 Tb 0:1 Ba 0:1 Fe 0:9 Ti 0:1 O 3 ceramics, fabricated by solid state reaction procedure. XRD forms of the samples at RT exhibited perovskite phase through the hexagonal structure at room temperature. Dielectric studies of the materials with frequency at different temperatures (25-400 C) exhibit two dielectric anomalies, first at 175 C (ferroelectric-ferroelectric transition) and second at around 320 C (ferroelectric-paraelectric transition). The Curie temperature moved towards the low side temperature with the increase in frequency. The less value of activation energy got for these samples could be attributed to the influence of electronic contribution to the conductivity. A significant change in the magnetic studies was observed for Bi 0:8 Tb 0:1 Ba 0:1 Fe 0:9 Ti 0:1 O 3 ceramic. The impedance analysis confirms the non-Debye type nature of the ceramic and relaxation frequency moved to a higher temperature. The Nyquist plot and conductivity studies showed the NTCR behavior of samples. The highest magnetization field was found at temperature À268.15 C.

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“…30,31 Two peaks in graph confirm the coexistence of two systems. 20 The complex electric modulus spectrum M 0 versus M 00 for the sample is shown in Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O₃ perovskite compound

2017

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“…The frequency independent region also suggests that the hopping charges carrier is absent at low frequencies. The AC conductivity at high frequency in this case obey Jonschers Universal Power Law given as follow: [34] σ ac = σ dc + Aω n (5) when A is a temperature dependent constant, ω = 2π f and n is the power law exponent which generally varies between 0 and 1 depending upon temperature. The value of power law exponent n represent the extent of interaction between mobile ions and lattice around.…”

Section: Electric Conductivitymentioning

confidence: 96%

Physical properties in nano-crystalline Ho2CoMnO6

Bhatti

Bhatti²,

Mahato

et al. 2020

Ceramics International

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3d based double perovskite materials have received much attention in recent years due to their exotic magnetic structure and magneto-electric coupling. In this work we have prepared and studied the nano-crystalline sample of Ho 2 CoMnO 6 . Structural, magnetic, Raman and dielectric properties have been studied in detail. The structural analysis shows that the sample crystallize in monoclanic crystal structure with P2 1 /n phase group. The X-ray photoelectron spectroscopy have been employed to confirms the charge state of cations presents in the material. Magnetic study shows that the sample undergoes a paramagnetic to ferromagnetic phase transition around T c ∼85 K. The isothermal magnetization measurements shows hysteresis curve hence confirm ferromagnetic behavior at low temperature. Temperature dependent Raman study reveals that there is spin phonon coupling in the sample marked by deviation in phonon mode from anharmonic behavior. Dielectric response of Ho 2 CoMnO 6 shows the large dispersion and large dielectric constant. Impedance spectroscopy and electrical modulus study reveal that system shows deviation from ideal Debye model. AC conductivity have been studied as a function of both temperature and frequency. We found that the conduction mechanism is obeyed by Jonscher's model. The exponent factor n is suggest that the material deviates from ideal Debye model.

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“…Value of M ′ increases with the increase of frequency and might be reaching the limiting value (M ∞ ) at higher frequencies, which may be beyond the frequency domain of experimental measurement setup. This observation may be due to the lack of restoring force governing the mobility of charge carriers under the action of an induced electric field [24,[38][39][40][41]. Increase in M ′ value with increasing frequency may be attributed to the relaxation phenomena associated with short range mobility of the charge carriers, which is spread over a range of frequencies [39].…”

Section: Impedance Studymentioning

confidence: 99%

Giant dielectric response in microwave processed CaCu3Ti4O12 ceramics: A correlation among microstructure, dielectric and impedance properties

Samanta

Nanda

Kumar

et al. 2019

PAC

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Polycrystalline CaCu 3 Ti 4 O 12 (CCTO) ceramics was synthesized by microwave assisted solid-state reaction. Effect of sintering at different temperatures on the crystal structure, dielectric and impedance properties was investigated in detail. Rietveld analysis of X-ray diffraction data identified that crystal structure was a mixture of cubic CCTO and monoclinic CuO phases. Lattice parameters and amount of CuO secondary phase were also estimated as a function of sintering temperature. Microstructural investigation confirmed the existance and successive increase of the melted phase near the grain boundary region with increasing temperature of sintering. Cu-rich nature of the melted phase was further confirmed by selective area EDX spectra. Dielectric and impedance properties were studied as a function of frequency (100 Hz to 1 MHz) and temperature (room temperature to 300°C). Improvement in dielectric properties as a function of sintering temperature (1000 to 1050°C) was explained in terms of reduction in grain boundary dimension due to the successive increase in Cu-rich melted phase. However, dielectric constant started falling when sintered at 1075°C, which may be accounted in terms of segregation of large amount of CuO phase after a certain temperature and hence a non-stoichiometry of Cu in CCTO lattice. Impedance data were modelled by equivalent electrical circuits to investigate different contributions of electrically heterogeneous systems. In addition, probable relaxation mechanism has been discussed on the basis of impedance and modulus data. Activation energies were calculated from different characterizations and a non-Debye-type relaxation phenomena were observed. In this work, an attempt is made to build up a correlation among synthesis procedure, sintering temperature, dielectric, impedance and microstructural properties.

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Impedance and Modulus Spectroscopy Characterization of Tb modified Bi0.8A0.1Pb0.1Fe0.9Ti0.1O3 Ceramics

Cited by 137 publications

References 36 publications

Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O₃ perovskite compound

Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O₃ perovskite compound

Physical properties in nano-crystalline Ho2CoMnO6

Giant dielectric response in microwave processed CaCu3Ti4O12 ceramics: A correlation among microstructure, dielectric and impedance properties

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Impedance and Modulus Spectroscopy Characterization of Tb modified Bi0.8A0.1Pb0.1Fe0.9Ti0.1O3 Ceramics

Cited by 137 publications

References 36 publications

Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O3 perovskite compound

Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O3 perovskite compound

Physical properties in nano-crystalline Ho2CoMnO6

Giant dielectric response in microwave processed CaCu3Ti4O12 ceramics: A correlation among microstructure, dielectric and impedance properties

Contact Info

Product

Resources

About

Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O₃ perovskite compound

Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O₃ perovskite compound