ac impedance analysis on crystalline layered and polycrystalline bismuth titanate

Huanosta, A.; Álvarez-Fregoso, O.; Amano, Érika; Tabares-Muñoz, C.; Mendoza, M.E.; Mendoza-Álvarez, J.G.

doi:10.1063/1.347730

Cited by 47 publications

(32 citation statements)

References 13 publications

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“…2,3 Dielectric, optical, and optoelectronic properties of BiT are of further interest in the area of optical memories since its band gap (E g $ 3.6 eV), 4 similar to most ferroelectric perovskite oxides, lies in the visible spectrum region. As a result, dielectric [5][6][7][8][9][10][11][12][13] and optical properties [13][14][15][16][17][18][19] of BiT have been extensively investigated for decades. In addition, there has been a renewed interest in the optical properties of ferroelectric BiT as noncentrosymmetric crystal structure of room temperature BiT could trigger asymmetric electron excitation, relaxation, and scattering leading to photovoltaic effect.…”

Section: Introductionmentioning

confidence: 99%

Optical anisotropy in bismuth titanate: An experimental and theoretical study

Roy

Prasad

Auluck

et al. 2014

Journal of Applied Physics

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We report experimental and theoretical investigation of anisotropy in optical properties and their origin in the ferroelectric and paraelectric phases of bismuth titanate. Room temperature ellipsometric measurements performed on pulsed laser deposited bismuth titanate thin films of different orientations show anisotropy in the dielectric and optical contstants, Subsequent first-principles calculations performed on the ground state structures of ferroelectric and high temperature paraelectric phases of bismuth titanate show that the material demonstrates anisotropic optical behavior in both ferroelectric and paraelectric phases. We further show that O 2p to Ti 3d transition is the primary origin of optical activity of the material while optical anisotropy results from the asymmetrically oriented Ti-O bonds in TiO 6 octehdra in the unit cell.

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Section: Introductionmentioning

confidence: 99%

Optical anisotropy in bismuth titanate: An experimental and theoretical study

Roy

Prasad

Auluck

et al. 2014

Journal of Applied Physics

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“…A partir de 400ºC el mecanismo de conducción predominante cambia, quizá por la variación de la movilidad, y la energía de activación es tan sólo de 0.26 eV. Entre 500 y 650ºC el valor de 0.53 eV obtenido para el plano ab, es igual a aquel del eje c, siendo similar al encontrado en la bibliografía (17). Este hecho indica que el mecanismo de conducción es probablemente es el mismo en los dos casos y que la anisotropía de la conductividad obedece a que las capas de óxido de bismuto actúan como barreras que interrumpen el transporte de carga.…”

Section: Resultados Y Discusiónunclassified

Conductividad eléctrica en corriente alterna de materiales cerámicos aurivillius de composición PbxBi4Ti3+xO12+3x, x=0,1,2 y 3

Lascano¹,

Caballero²,

Villegas³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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Se ha estudiado la conductividad eléctrica en corriente alterna (ca) de la serie de materiales cerámicos ferroeléctricos con estructura Aurivillius: Pb x Bi 4 Ti 3+x O 12+3x , donde x = 0,1,2 y 3. El estudio se realiza a partir de la medida de la impedancia sobre muestras texturadas y no texturadas. La conductividad eléctrica disminuye sucesiva y aproximadamente en un orden de magnitud con el incremento sucesivo de un mol de titanato de plomo en la estructura del titanato de bismuto. Se mantiene la anisotropía de la conductividad entre el plano ab y el eje c de la estructura cristalina. La respuesta parece estar relacionada tanto con la variación del número de vacantes de oxígeno presentes en la estructura cristalina de los materiales, como con la variación de la relación de esbeltez de las placas que componen la microestructura de las muestras. Se presentan también los valores de energía de activación del proceso de conducción eléctrica en diferentes rangos de temperatura, tanto en la fase ferroeléctrica como en la paraeléctrica. Palabras clave: Aurivillius, conductividad eléctrica, ferroelectricidad, texturaElectric conductivity of Aurivillius ceramic materials of composition Pb x Bi 4 Ti 3+x O 12+3x , x=0,1,2 y 3.The ac electric conductivity of both textured and non textured Aurivillius ferroelectric ceramics Pb x Bi 4 Ti 3+x O 12+3x , where x = 0,1,2 and 3, has been studied by impedance measurements. The electrical conductivity decreases approximately one order of magnitude with the incorporation of a mol of lead titanate into the bismuth titanate structure. The anisotropy of the conductivity is kept between the ab plane and the c axis. The response seems to be related to the number of oxygen vacancies present in the crystalline structure of the materials, as well as to the aspect ratio of the grains. The activation energy values of the electrical conduction process are presented for both the ferroelectric and paraelectric phases.Key words: Aurivillius, electric conductivity, ferroelectricity, texture INTRODUCCIÓNUn grupo de materiales piezoeléctricos que ha alcanzado gran importancia en los últimos años es el de los Ferroeléctricos con Estructura Laminar de Bismuto (FLB), o tipo Aurivillius. Estos materiales poseen estructura laminar, que consiste en capas octaédricas tipo perovskita, entre las que se intercalan láminas de (Bi 2 O 2 ) 2+ (1). Debido a sus propiedades, varios compuestos FLB son candidatos a utilizarse como piezoeléctricos de alta temperatura de operación, en dispositivos electroópticos, como sensores de presión y en memorias no volátiles ferroeléctricas (2-5). Sin embargo, se deben superar ciertos problemas antes de extender la aplicación tecnológica de materiales cerámicos FLB, aunque su utilización en lámina delgada parece estar más madura.El problema más importante es la conductividad relativamente alta que presentan muchos FLB en el plano ab donde se ubica la polarización espontánea (6,7). Esto dificulta la polarización de estos materiales preparados en forma cerámica y, por consiguiente...

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“…Literature studies have demonstrated that impedance data related to bismuth titanates are quite complex; therefore, several semicircles are indeed expected. According to recent reports 57,58 , the first semicircle at higher frequencies can be attributed to crystalline plate, followed by plate boundary and grain boundary, respectively. Moreover, when temperature achieves 200ºC, a fourth arc appears in the modulus diagram for lower values of frequency.…”

Section: Resultsmentioning

confidence: 99%

Production of Nanometric Bi4Ti3O 12 Powders: from Synthesis to Optical and Dielectric Properties

et al. 2018

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This paper aims to evaluate the synthesis and annealing parameters for production of nanometric Bi 4 Ti 3 O 12 and its properties. The powders were obtained through the solution combustion route and the impacts of annealing temperature on the materials' physicochemical features as well as their optical and electrical properties were investigated. Thus, the prepared powders were annealed at 600ºC, 700ºC and 800ºC and then characterized by several techniques. The results demonstrated that the combustion method was effective for production of nanocrystalline powders with high levels of purity. A trend for particle and crystallite growth was observed as the calcination temperature increased. X-Ray, HRTEM and Raman spectroscopy confirmed the crystalline nature of the powders, whereas impedance spectroscopy demonstrated a reduction of electrical resistance according to the calcination temperature applied. Optical properties were not highly influenced by annealing. The temperature of 600ºC was appropriate to produce crystalline particles with desirable low sizes for application.

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ac impedance analysis on crystalline layered and polycrystalline bismuth titanate

Abstract: Effect of bismuth oxide as a buffer layer on metal-lanthanum-substituted bismuth titanate-insulator-semiconductor structures

Cited by 47 publications

References 13 publications

Optical anisotropy in bismuth titanate: An experimental and theoretical study

Optical anisotropy in bismuth titanate: An experimental and theoretical study

Conductividad eléctrica en corriente alterna de materiales cerámicos aurivillius de composición Pb<sub>x</sub>Bi<sub>4</sub>Ti<sub>3+x</sub>O<sub>12+3x</sub>, x=0,1,2 y 3

Production of Nanometric Bi4Ti3O 12 Powders: from Synthesis to Optical and Dielectric Properties

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