Complex impedance spectroscopic studies of Ba(Pr1/2Ta1/2)O3 ceramic

Mishra, Amodini; Choudhary, S. N.; Prasad, K.; Choudhary, R. N. P.

doi:10.1016/j.physb.2011.05.040

Cited by 39 publications

(15 citation statements)

References 28 publications

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“…It is observed that the magnitude of Z′ decreases with the increase of temperature indicates that there is an increase in conductivity. The value of Z′ appears to be independent of frequency for all the temperatures indicating that there is an increase in the concentration of defects with the rise in temperature resulting in increase of conductivity in the system [22]. The log-log plot of frequency versus ac conductivity at different temperatures is shown in Fig.8.…”

Section: Dielectric Studymentioning

confidence: 92%

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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Section: Dielectric Studymentioning

confidence: 92%

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

Kumar¹

2013

IJMSA

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“…All the samples showed a decrease in corresponding resistance with increasing temperature, which is a typical semiconductor behavior contradictory to metals. The depressed nature of the semicircular arcs showed deviation from the ideal semicircle which was attributed to the non‐Debye type of relaxation mechanism in the BSZT ceramic samples …”

Section: Resultsmentioning

confidence: 99%

“…This may be due to an increase in conduction losses because of the hoping mechanism between the Ti 4+ and Ti 3+ (Ti 4+ +e′↔Ti 3+ ). Due to the chemical stability of Zr 4+ ion compared to Ti 4+ , electron hoping mechanism is depressed by the substitution of Zr 4+ for Ti 4+ which is responsible for the corresponding decrease in E a …”

Section: Resultsmentioning

confidence: 99%

“…Due to the chemical stability of Zr 4+ ion compared to Ti 4+ , electron hoping mechanism is depressed by the substitution of Zr 4+ for Ti 4+ which is responsible for the corresponding decrease in E a . [21][22][23] Figure 8 presents the hysteresis loops for the BSZT ceramics measured at room temperature, which shows a typical relaxor behavior. All samples showed well-saturated hysteresis loops.…”

Section: Resultsmentioning

confidence: 99%

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Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems

Mahmood

Akhtar

Iqbal

et al. 2017

Int J Applied Ceramic Tech

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Ba0.7Sr0.3ZrxTi1−xO3 (BSZT; where x=0.02, 0.04, 0.06, 0.08, 0.1) ceramics were processed through a sol‐gel method at 1450°C for 6 h. All the samples showed a diffuse phase transition which might be due to the presence of polar nanoregions, those associated with the composition inhomogeneity in the BSZT ceramics. The sample with x=0.02 exhibited a dielectric constant (ɛ=23714) which successively decreased with increasing x up to 8569 for the sample with x=0.1 around Tc measured at 10 kHz. Ceramic samples showed a ferroelectric hysteresis behavior similar to relaxor materials.

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“…42 Además, a bajas frecuencias se observa el decremento en el valor de Z´ con el aumento de la temperatura lo que sugiere una resistencia dependiente de la temperatura con coeficiente de temperatura negativo (NTC) similar al de los materiales semiconductores. 43 En las Figuras 8(d, e, f) se presenta la relación de la parte imaginaria de la impedancia vs frecuencia para un amplio rango de temperaturas para los sistemas (d) BiFeO 3 sin dopar, (e) BiFe 0.94 Nb 0.06 O 3 y (f) Bi 0.90 Ba 0.10 Fe 0.94 Nb 0.06 O 3 . Los gráficos de Z´´ vs frecuencia se caracterizan por (i) la aparición de un pico con un valor máximo a una cierta frecuencia, (ii) ancho asimétrico de los picos, (iii) el desplazamiento del valor de Z´´m áx a frecuencias más altas con el aumento de la temperatura y (iv) disminución en la magnitud de Z´´m ax con el aumento de la temperatura.…”

Section: Figura 3 Difractogramas De Los Polvos Cerámicos Del Sistemaunclassified

Modificación de las propiedades estructurales, eléctricas y magnéticas del BiFeO3 por la incorporación de Ba y Nb

Narváez¹,

Raigoza²,

Nieva³

2016

Quim. Nova

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.06 y 0.09) powders were synthesized using the citrate-gel method. Infrared spectroscopy indicated shifting of Bi/Ba-O and Fe/Nb-O bond vibrations and a structural transition was observed by X-ray diffraction. A Williamson-Hall (W-H) analysis revealed that Ba/Nb dopant reduces the particle size and increases the strain crystalline lattice. Impedance analysis suggests that electrical relaxation process is temperature dependent, for all compositions obtained. Furthermore, electrical conductivity increases with temperature showing a typical negative temperature coefficient of the resistance (NTCR) analogous to a semiconductor. Magnetization v magnetic field curves reveal weak ferromagnetic behaviour within the BiFeO 3 doped with Ba and Nb, and co-doped with Ba-Nb, measured at room temperature.Keywords: multiferroic; citrate-gel; W-H analysis; magnetic properties. INTRODUCCIÓNExisten muy pocos materiales multiferroicos tanto en su forma natural como sintetizados en un laboratorio, un material representativo de este grupo es la ferrita de bismuto, BiFeO 3 (BFO), que presenta ventajas sobre otros compuestos multiferroicos debido a sus elevadas temperaturas de Curie y de Néel (T C~ 1100 K, T N~ 640 K). El BFO ha despertado interés en las ciencias básicas y ha demostrado un gran potencial para nuevas aplicaciones, debido a que presenta propiedades ferromagnéticas (ordenamiento antiferromagnético tipo G) y ferroeléctricas a temperatura ambiente.1 El problema principal de este sistema es la dificultad de obtenerlo monofásico por métodos convencionales ya que al sintetizarlo se forman simultáneamente diversas fases secundarias como Bi 2 O 3 , Bi 2 Fe 4 O 9 y Bi 25 FeO 39 ; una de las opciones para eliminar la presencia de fases secundarias es su dopaje con cationes que sustituyan los sitios A y B en su estructura y a su vez, favorezca sus propiedades físicas. Un aumento de la magnetización fue reportado para cerámicas de BiFeO 3 dopadas, indicando una forma posible de suprimir la modulación de espines en soluciones sólidas Bi 1-x A x FeO 3 (A=La, Ba, Pb).2,3,4 Se encontró que el valor de la magnetización neta depende fuertemente de la clase de elemento diamagnético que se use como dopante; por ejemplo, la magnetización espontánea de las muestras dopadas con bario es al menos un orden de magnitud mayor que el observado para las soluciones sólidas resultado del dopaje con lantano con la misma concentración de dopante, 2,4 la naturaleza de una correlación entre el tipo de dopante diamagnético y las propiedades magnéticas de las muestras aún no es muy clara.3 Recientemente, algunos investigadores estudiaron la sustitución de hierro por niobio para el BFO, reportando un gran aumento en la resistividad eléctrica de las cerámicas obtenidas, una débil polarización remanente y un comportamiento similar al ferromagnético.5 Otros investigadores prepararon cerámi-cas de BFO sustituyendo el hierro por niobio y cobalto, reportando pequeñas transiciones de fase estructurales, así como bajas pérdidas dieléctricas, ellos sugieren que el do...

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Complex impedance spectroscopic studies of Ba(Pr1/2Ta1/2)O3 ceramic

Cited by 39 publications

References 28 publications

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

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

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems

Modificación de las propiedades estructurales, eléctricas y magnéticas del BiFeO3 por la incorporación de Ba y Nb

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Complex impedance spectroscopic studies of Ba(Pr1/2Ta1/2)O3 ceramic

Cited by 39 publications

References 28 publications

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

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

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba0.7Sr0.3TiO3 polycrystalline ceramic systems

Modificación de las propiedades estructurales, eléctricas y magnéticas del BiFeO3 por la incorporación de Ba y Nb

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Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems