Investigation of the electrical properties of SnO2 varistor system using impedance spectroscopy

Bueno, Paulo Roberto; Pianaro, S. A.; Pereira, Ernesto C.; Bulhões, L.O.S.; Longo, Elson; Varela, José Arana

doi:10.1063/1.368587

Cited by 152 publications

(111 citation statements)

References 18 publications

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“…Due to its electrical and optical properties, SnO 2 and impurity-doped SnO 2 are mainly used as an electrode for dye-sensitized solar cell [95] and electrochromic devices [96], a catalyst in chemical reactions [97], a varistor [98], and a gas sensor [99].…”

Section: Sno 2 -Basedmentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

116

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Metal oxides are widely used in many applications such as thermoelectric, solar cells, sensors, transistors, and optoelectronic devices due to their outstanding mechanical, chemical, electrical, and optical properties. For instance, their high Seebeck coefficient, high thermal stability, and earth abundancy make them suitable for thermoelectric power generation, particularly at a high-temperature regime. In this article, we review the recent advances of developing high electrical properties of metal oxides and their applications in thermoelectric, solar cells, sensors, and other optoelectronic devices. The materials examined include both narrow-band-gap (e.g., Na x CoO 2 , Ca 3 Co 4 O 9 , BiCuSeO, CaMnO 3 , SrTiO 3 ) and wide-band-gap materials (e.g., ZnO-based, SnO 2 -based, In 2 O 3 -based). Unlike previous review articles, the focus of this study is on identifying an effective doping mechanism of different metal oxides to reach a high power factor. Effective dopants and doping strategies to achieve high carrier concentration and high electrical conductivities are highlighted in this review to enable the advanced applications of metal oxides in thermoelectric power generation and beyond.

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Section: Sno 2 -Basedmentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

116

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“…Therefore, Rs could be considered as electrode resistance and not strongly influence the circuit parameters adjusted for the model in Fig. 6 or for the model without Rs resistance, as reported in the literature [19]. Other more complex models, which incorporate the influence of charge densities in the grains associated with the thickness of the intergranular layer, have been reported [20].…”

Section: Resultsmentioning

confidence: 99%

Electrical and microstructural properties of microwave sintered SnO2-based varistors

et al. 2012

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An investigation was made of the microstructural and electrical properties of SnO 2 -based varistors microwave sintered at 1200 ºC, applying a heating rate of 120 ºC/min and treatment times of 10, 20, 30, 40, 50 and 60 min. The system used in this study was (98.95-X)%SnO 2 .1.0%CoO.0.05%Cr 2 O 3 .X%Ta 2 O 5 , where X corresponds to 0.05 and 0.065 mol%. Sintering was carried out in a domestic microwave oven (2.45 GHz) fitted for lab use. Silicon carbide was placed in a refractory vessel to form a heating chamber surrounding the sample holder. The pellets were examined by scanning electron microscopy, X-ray diffractometry, direct current measurements and impedance spectroscopy. The parameters of density, medium grain size, coefficient of nonlinearity, breakdown electrical field, leakage current, and height and width of the potential barrier were analyzed.

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“…Al igual que el óxido de cinc, ZnO, el SnO 2 es un semiconductor con banda prohibida ancha y presenta una adecuada combinación de propiedades químicas, electrónicas y ópticas que lo hacen útil como material para sensores de gas, catalizadores, dispositivos optoelectrónicos, electrodos electrocatalíticos y células fotovoltaicas (2)(3)(4)(5); recientemente se ha generado un gran interés por el desarrollo de varistores con base en el SnO 2 (6)(7)(8)(9). Concretamente como sensor químico presenta alta sensibilidad a atmósferas reductoras pero una pobre selectividad y baja estabilidad térmica a elevadas temperaturas.…”

Section: Introductionunclassified

Uso de métodos químicos para obtener polvos cerámicos del sistema (Sn, Ti)O<sub>2</sub>

Ararat¹,

Varela²,

Páez³

2005

Bol. Soc. Esp. Ceram. Vidr.

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El sistema (Sn,Ti)O 2 , puro o dopado, tiene gran interés por las potencialidades tecnológicas que presenta como sensor de gas y varistor. A pesar del amplio estudio realizado de este sistema binario, respecto a las propiedades termodinámicas y cinéticas de la descomposición espinoidal que en él se presenta, sus propiedades y sus posibles aplicaciones no se han abordado con profundidad. Por otro lado, se ha realizado muy poco trabajo para optimizar métodos de síntesis que permitan obtener polvos cerámicos de (Sn,Ti)O 2 , puro o dopado, con características físicas y químicas pre-determinadas. En este trabajo se realizó la síntesis de polvos cerámicos de este sistema utilizando los métodos de coprecipitación y precursor polimérico (Pechini) y se discutieron los diferentes fenómenos fisicoquímicos que ocurren durante la síntesis. Los polvos obtenidos se caracterizaron con Difracción de Rayos X (DRX), análisis térmicos (ATD/TG) y Microscopia Electrónica de Barrido (MEB). La determinación de las diferentes etapas del proceso, como de los parámetros involucrados en el mismo, permitió el control de la síntesis y la obtención de partículas nanométricas del sistema (Sn,Ti)O 2 a temperaturas bajas: 450°C para coprecipitación y 600°C para el método Pechini. Además, se discutió el fenómeno de descomposición espinoidal que presentan las muestras tratadas a 900°C. Palabras Clave: Síntesis, (Sn,Ti)O 2 , Coprecipitación, Precursor Polimérico. Use of chemical methods to obtain (Sn, Ti)0 2 ceramic powdersThe (Sn,Ti)O 2 system has a great interest due to its technological applications such as gas sensor and varistor. Although the thermodynamic properties and the kinetics of spinoidal decomposition in this system have been extensively studied, the general properties and applications of SnO 2 -TiO 2 binary compositions have been not investigated yet in depth. On the other hand, little work has been done to optimize the synthesis methods to obtain (Sn,Ti)O 2 ceramic powders, with pre -determinate physical and chemical characteristics. In this work the ceramic powders has been obtained by coprecipitation and polymeric precursor (Pechini) methods. The different physical chemistry phenomena that occurred during the synthesis were discussed. The (Sn,Ti)O 2 ceramic powders were characterized with X-ray diffraction (XRD), thermal analysis (DTA/ TG) and scanning electron microscopy (SEM). The knowledge about of steps and variables of synthesis process acquired with development of this work, we permited to obtain (Sn, Ti)O 2 nanometers particles to low temperatures: to 450°C for coprecipitation method and to 600°C for Pechini method. The spinodal decomposition that ocurr to 900°C was discussed also.

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Investigation of the electrical properties of SnO2 varistor system using impedance spectroscopy

Cited by 152 publications

References 18 publications

Metal oxides for thermoelectric power generation and beyond

Metal oxides for thermoelectric power generation and beyond

Electrical and microstructural properties of microwave sintered SnO2-based varistors

Uso de métodos químicos para obtener polvos cerámicos del sistema (Sn, Ti)O<sub>2</sub>

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