Electrical behaviour of Bi5FeTi3O15 and its solid solutions with CaBi4Ti4O15

Moure, C.; Lascano, Luis; Tartaj, J.; Durán, P.

doi:10.1016/s0272-8842(02)00096-2

Cited by 37 publications

(15 citation statements)

References 15 publications

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“…Potassium ion vacancies may preferably be formed over bismuth ion vacancies as bismuth ions have a large in size and mass, and tend to be immobile, If at all, the bismuth ion has to participate, it will be in the location where bismuth can go from +3 states to +4 states or vice versa. That is the electrical conductivity of bismuth oxide based ceramic crystals is attributed to a mechanism of small polar-on hopping between the occupied to unoccupied valency states [29,30].…”

Section: Where K Is Boltzman Constantmentioning

confidence: 99%

Impedance spectroscopy studies of K0.5Bi0.5TiO3

Rao¹,

Sankaram

2009

J Electroceram

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Lead free Potassium bismuth Titanate K 0.5 Bi 0.5 TiO 3 (KBT) was prepared by high temperature solid state reaction method in a closed crucible with excess KBT powder around the samples. A room temperature study of XRD confirms, single phase formation with tetragonal structure .Grain and grain boundary conduction is observed from complex impedance spectrum at high temperatures (425°C) by the appearance of two semicircular arcs. The Cole-Cole plots of impedance spectrum consisted of a Circular arc followed by a semicircular spur indicate that the dielectric phenomenon of KBT is due to conductive grain boundaries. The temperature variation of grain resistance and grain boundary resistance is observed with the activation energies. The presence of nonDebye type multiple relaxations has been confirmed by complex modulus analysis. The dielectric data obtained from impedance measurements, indicates broad dielectric peaks around 380°C. The ferroelectric nature confirmed from hysteresis plot. The DC Conductivity results indicate activation energy 0.54 eV below 400°C and 0.85 eV above 400°C. The AC conductivity values and electric modulus values are computed from the impedance data. The activation energies of AC conductivity have observed to decrease with decrease in frequencies.

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Section: Where K Is Boltzman Constantmentioning

confidence: 99%

Impedance spectroscopy studies of K0.5Bi0.5TiO3

Rao¹,

Sankaram

2009

J Electroceram

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“…9a has been proposed. The circuit comprises three systems made up of the R resistance linked in parallel with a constant-phase element (CPE) [20,21],…”

Section: Impedance Spectroscopymentioning

confidence: 99%

“…8a-d) obtained for the investigated samples, a distinct division of the contribution of individual regions cannot be observed. According to [21], a single arc corresponds to the bulk conductivity. Data points of the arc were fitted using the CNLS fitting routine LEVMW [20].…”

Section: Impedance Spectroscopymentioning

confidence: 99%

Dielectric and Structural Properties of Bi5Ti3FeO15 Ceramics Obtained by Solid-State Reaction Process from Mechanically Activated Precursors

2011

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Bi 5 Ti 3 FeO 15 (BTFO), an Aurivillius compound, was synthesized via sintering the Bi 2 O 3 and Fe 2 O 3 mixture and TiO 2 oxides. The precursor material was ground in a high-energy attritorial mill for (1, 3, 5, and 10) h. The orthorhombic system Bi 5 Ti 3 FeO 15 ceramics was obtained by a solid-state reaction process at 1313 K. Phase formation behavior was investigated using differential thermal analysis (DTA), thermal gravimetric (TG), and X-ray diffraction (XRD) techniques. The frequencydependent properties of the material were investigated by impedance spectroscopy. The impedance spectroscopic method is widely used to characterize electrical properties of materials and their interfaces with electronically conducting electrodes. These studies indicate that 1h, 3h, and 5h primary high-energy ball milling followed by sintering is a promising technique for pure Bi 5 Ti 3 FeO 15 ceramic preparation, whereas the ceramics obtained from the substrates after 10h milling is a two-phase material. As the result of this investigation, the model of adjusting the Nyquist charts with a three-element R-CPE (constant phase element) series connection was proposed. It was found that the value of the dielectric constant at the Curie temperature decreases when the milling time of the substrates increases. The decrease in the dielectric constant is influenced by the great dispersion of the grains, their dense packing, and location of particular grains in relation to other grains. Moreover, the change of resistivity with frequency indicates that relaxation processes take place in the material. In conclusion, J. Dercz (B)

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“…Since BLSFs generally have high Curie temperature and high coercive field at room temperature, it is necessary to perform poling at high temperature [123]. However, relatively high conductivity often prevents the application of high electrical field during the high-temperature poling treatment [123][124]. The conductivity, therefore, should be reduced in BLSFs to increase the poling efficiency.…”

Section: Piezoelectric Studiesmentioning

confidence: 99%