Dielectric relaxation in complex perovskite oxide BaCo1/2W1/2O3

Prakash, Ved; Choudhary, S. N.; Sinha, T.P.

doi:10.1016/j.physb.2007.08.015

Cited by 25 publications

(9 citation statements)

References 10 publications

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“…It is generally accepted that the overlapping peak position of M ″ and Z ″ curves is related to delocalized or long‐range relaxation phenomena 26,38 . As the temperature is increased, M ″ tends to M ″∞, which indicates the mobility of charge carriers from short range to long range 39 . This behavior appears to be related to the predominance of delocalization effects (DC conduction), which is the electronic driven force in our sample.…”

Section: Resultsmentioning

confidence: 60%

Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr₂MnTiO_6−δ Perovskite Nanocrystals

Álvarez-Serrano

Arillo

Garcı́a-Hernández

et al. 2010

Journal of the American Ceramic Society

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Polycrystalline Sr2MnTiO6−δ (SMTO) nanosized powders have been prepared by the liquid mix technique. Thermogravimetric experiments show the presence of small amounts (4%) of Mn3+ in the sample. A systematic structural study shows the stabilization of nanocrystals of about 50 nm, which crystallize in an space group Pm3m, i.e. the arystotype perovskite. Microstructural analysis permits us to interpret the electrical and magnetic properties in terms of a high degree of structural disorder including intergrowths. Although the existence of polytypes in small regions is observed, the title sample can be globally (macroscopically) considered as cubic. A spin‐glass type magnetic frustration behavior has been detected using different techniques: DC and AC magnetization variation with temperature and magnetic field. SMTO shows a very high dielectric constant, approaching 105 at 580 K, and being practically temperature independent above 680 K. Also, the dependence with frequency is negligible below 580 K. Electrical behavior has been interpreted considering the nanoscaled size of particles. The high semiconductive character of the sample perovskite is the key feature of the giant dielectric constant observed.

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Section: Resultsmentioning

confidence: 60%

Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr₂MnTiO_6−δ Perovskite Nanocrystals

Álvarez-Serrano

Arillo

Garcı́a-Hernández

et al. 2010

Journal of the American Ceramic Society

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“…At very low frequencies (f << 1/τ, τ is the relaxation time), dipoles follow the electric field and at very high frequencies (f >> 1/τ), dipoles can no longer follow the field. As the frequency increases (f < 1/τ), dipoles begin to lag behind the field and when the frequency reaches the characteristic frequency (f = 1/τ), the dielectric constant falls steeply [11][12]. At low frequencies, the dispersion of real and imaginary parts of dielectric constant is due to space charge polarization which is observed for all the temperatures [13].…”

Section: Dielectric Studymentioning

confidence: 92%

“…The log-log plot of frequency versus ac conductivity at different temperatures is shown in Fig.8. The ac conductivity is calculated from the dielectric data using the relation σ ac = 2πfε'ε o tan δ [11]. It can be observed that the ac conductivity increases with increasing frequency for all the temperatures.…”

Section: Dielectric Studymentioning

confidence: 99%

Dielectric Relaxation, Ionic Conduction and Complex Impedance Studies on NaNo3 Fast Ion Conductor

Kumar¹

2013

IJMSA

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AC conductivity, dielectric constant, loss and electric modulus of Sodium nitrate system have been studied in the frequency range from 1Hz to 10MHz and in the temperature range from 303 K to 563 K by employing impedance spectroscopy. The frequency dependent ac conductivity follows Jonscher's universal power law. Dimensionless frequency exponent (n), dispersion parameter (A) are determined. The change over frequency independent conductivity to frequency dependent conductivity at all temperatures shows the relaxation mechanism. The variation of real part of dielectric constant with frequency shows strong dispersion at low frequencies and saturation at high frequencies. The presence of peaks in the frequency plots of dielectric loss, imaginary parts of impedance and modulus are attributed to the relaxation processes. It is also confirmed by the temperature dependence study of real part of dielectric constant. The activation energy from relaxation processes and conductivity has been evaluated.

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“…These two relaxation processes are due to the bulk ͑first process͒ and to the grain boundary ͑second process͒. This effect was not observed in other double perovskites, [39][40][41][42][43][44][45] probably due to the high sintering temperature used in these other compounds. In order to analyze the temperature dependence of the relaxation time of these two processes we plot in Fig.…”

Section: Resultsmentioning

confidence: 92%

“…This effect is not observed in other double perovskites. [39][40][41][42][43][44][45] As well as in other double perovskites, the frequency at which the maximum occurs depends on the temperature where the relaxation time is thermally activated. At the right of the main peak a subtle peak whose maxima shift up with the temperature is observed.…”

Section: Resultsmentioning

confidence: 99%

Relaxations in Ba2BiSbO6 double complex perovskite ceramics

Castro

Paschoal

Snyder

et al. 2008

Journal of Applied Physics

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The electric properties of the complex double perovskite Ba 2 BiSbO 6 have been investigated using impedance spectroscopy in the frequency range from 1 Hz up to 1 MHz and in the temperature range from room temperature up to 560 K. There are two contributions to the electrical properties due to the grain and grain boundary. The oxygen vacancies play an important role in the conductivity and strongly increase the dielectric constant at high temperatures. The analysis of the frequency dependence of the conductivity clearly shows the structural phase transition of this compound near 515 K.

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Dielectric relaxation in complex perovskite oxide BaCo1/2W1/2O3

Cited by 25 publications

References 10 publications

Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr₂MnTiO_6−δ Perovskite Nanocrystals

Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr₂MnTiO_6−δ Perovskite Nanocrystals

Dielectric Relaxation, Ionic Conduction and Complex Impedance Studies on NaNo3 Fast Ion Conductor

Relaxations in Ba2BiSbO6 double complex perovskite ceramics

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Dielectric relaxation in complex perovskite oxide BaCo1/2W1/2O3

Cited by 25 publications

References 10 publications

Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr2MnTiO6−δ Perovskite Nanocrystals

Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr2MnTiO6−δ Perovskite Nanocrystals

Dielectric Relaxation, Ionic Conduction and Complex Impedance Studies on NaNo3 Fast Ion Conductor

Relaxations in Ba2BiSbO6 double complex perovskite ceramics

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Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr₂MnTiO_6−δ Perovskite Nanocrystals

Microstructural Origin of Magnetic and Giant Dielectric Behavior of Sr₂MnTiO_6−δ Perovskite Nanocrystals