métodos químicos para obtener varistores basados en sno2

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ID: 138920
2006
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Abstract
Synthesis of SnO2 ceramic powders was made by coprecipitation method and polymeric precursor method (Pechini) to obtain Sn-Co-Nb-Ti-Al varistor systems. The particles of the obtained ceramic powder presented nanometric size and SnO2 was the principal crystalline phase in them according to X-ray diffraction results. To determine the behavior of the synthesized samples in front of the thermal treatments, thermal analysis (DTA/TG) were made. Dilatometric studies on previously pressed samples were carried out. The optimal conditions of sintering of this raw material were determined. Microstructures and electric properties of sintered samples were studied using scanning electron microscopy (SEM) and I-V characteristics curves. The samples presented varistor behavior independent of the synthesis method used, with high nonlinearity values as 32. The presence of Al3+ favored the concentration of oxygen vacancies, and the grain growth.

La síntesis de polvos cerámicos basados en SnO2 fue realizada a través de los métodos de coprecipitación y precursor polimérico (Pechini) y el producto obtenido fue utilizado para obtener varistores del sistema Sn-Co-Nb-Ti-Al. Las partículas del polvo cerámico obtenido presentaron tamaño nanométrico y según los resultados de Difracción de Rayos X, la fase cristalina más importante presente en ellas fue SnO2. Para determinar el comportamiento de las muestras sintetizadas frente a los tratamientos térmicos se realizó análisis térmico (ATD/TG) de las mismas. De los estudios de dilatometría, realizados a muestras prensadas previamente, se determinaron las condiciones óptimas de sinterización de esta materia prima. Las propiedades microestructurales y eléctricas de muestras sinterizadas fueron estudiadas utilizando microscopía electrónica de barrido MEB y curvas I-V. Las muestras presentaron comportamiento varistor independientemente del método de síntesis utilizado, con valores tan altos del coeficiente no-lineal como 32. La presencia de Al3+ favoreció la concentración de vacantes de oxígeno y el crecimiento del tamaño de grano.
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Authors ;Rodríguez-Páez, J. E.;Varela, J. A.;Mosquera, A.
Journal medicinal chemistry (shariqah (united arab emirates))
Year 2006
DOI
DOI not found
URL
http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/264/282
Keywords
synthesis sno2 glass Ceramics

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