<b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b>
The influence of the dopant Pr6O11 was investigated with regard to the electrical and microstructural properties of the system (98.95-x)%SnO2.1.0%CoO.0.05%Ta2O5.x%Pr6O11, where x = 0.05%, 0.10%, 0.30% and 0.50% in mol. Pr6O11 doping modifies the electrical behavior of the ceramics. The electrical pa...
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doaj-9ee67e47592c4682919077d065b69c942020-11-25T01:51:59ZengUniversidade Estadual de MaringáActa Scientiarum: Technology1806-25631807-86642014-04-0136223724410.4025/actascitechnol.v36i2.1799510610<b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b>Hervê Stangler Irion0Eder Carlos Ferreira de Souza1André Vitor Chaves de Andrade2Sandra Regina Masetto Antunes3Augusto Celso Antunes4Universidade Estadual de Ponta GrossaUniversidade Estadual de Ponta GrossaUniversidade Estadual de Ponta GrossaUniversidade Estadual de Ponta GrossaUniversidade Estadual de Ponta GrossaThe influence of the dopant Pr6O11 was investigated with regard to the electrical and microstructural properties of the system (98.95-x)%SnO2.1.0%CoO.0.05%Ta2O5.x%Pr6O11, where x = 0.05%, 0.10%, 0.30% and 0.50% in mol. Pr6O11 doping modifies the electrical behavior of the ceramics. The electrical parameters were: α = 8.0, EB = 319 V cm-1 and Vb = 0.66 V barrier-1 for the system without Pr6O11 and α = 17.0, EB = 853 V cm-1 and Vb = 1.15 V barrier-1 with the addition of 0.10% in mol Pr6O11. The system with 0.05% in mol Pr6O11 had the same non-linearity coefficient α as the system with 0.10% in mol. However, breakdown electrical field and voltage per barrier rates were lower (EB = 708 V cm-1 and Vb = 0.98 V barrier-1). The low rates in the breakdown electrical field enabled the varistor systems under study to be used in protection systems for low-voltage energy grids. In the case of Pr6O11 concentrations above 0.10% in mol, the presence of the dopant became deleterious to the varistor’s electrical characteristics. This effect was due to an increase in praseodymium stannate (Pr2Sn2O7) secondary phase. The crystalline phase coupled to the cassiterite (SnO2) phase was found with XRD and SEM/EDS and quantified by Rietveld’s refining method.http://186.233.154.254/ojs/index.php/ActaSciTechnol/article/view/17995characterizationtin dioxidepraseodymium oxidetantalum oxide |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hervê Stangler Irion Eder Carlos Ferreira de Souza André Vitor Chaves de Andrade Sandra Regina Masetto Antunes Augusto Celso Antunes |
spellingShingle |
Hervê Stangler Irion Eder Carlos Ferreira de Souza André Vitor Chaves de Andrade Sandra Regina Masetto Antunes Augusto Celso Antunes <b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b> Acta Scientiarum: Technology characterization tin dioxide praseodymium oxide tantalum oxide |
author_facet |
Hervê Stangler Irion Eder Carlos Ferreira de Souza André Vitor Chaves de Andrade Sandra Regina Masetto Antunes Augusto Celso Antunes |
author_sort |
Hervê Stangler Irion |
title |
<b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b> |
title_short |
<b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b> |
title_full |
<b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b> |
title_fullStr |
<b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b> |
title_full_unstemmed |
<b>Effect of Pr<sub>6</sub>O<sub>11</sub> doping in electrical and microstructural properties of SnO<sub>2</sub>-based varistors<b> |
title_sort |
<b>effect of pr<sub>6</sub>o<sub>11</sub> doping in electrical and microstructural properties of sno<sub>2</sub>-based varistors<b> |
publisher |
Universidade Estadual de Maringá |
series |
Acta Scientiarum: Technology |
issn |
1806-2563 1807-8664 |
publishDate |
2014-04-01 |
description |
The influence of the dopant Pr6O11 was investigated with regard to the electrical and microstructural properties of the system (98.95-x)%SnO2.1.0%CoO.0.05%Ta2O5.x%Pr6O11, where x = 0.05%, 0.10%, 0.30% and 0.50% in mol. Pr6O11 doping modifies the electrical behavior of the ceramics. The electrical parameters were: α = 8.0, EB = 319 V cm-1 and Vb = 0.66 V barrier-1 for the system without Pr6O11 and α = 17.0, EB = 853 V cm-1 and Vb = 1.15 V barrier-1 with the addition of 0.10% in mol Pr6O11. The system with 0.05% in mol Pr6O11 had the same non-linearity coefficient α as the system with 0.10% in mol. However, breakdown electrical field and voltage per barrier rates were lower (EB = 708 V cm-1 and Vb = 0.98 V barrier-1). The low rates in the breakdown electrical field enabled the varistor systems under study to be used in protection systems for low-voltage energy grids. In the case of Pr6O11 concentrations above 0.10% in mol, the presence of the dopant became deleterious to the varistor’s electrical characteristics. This effect was due to an increase in praseodymium stannate (Pr2Sn2O7) secondary phase. The crystalline phase coupled to the cassiterite (SnO2) phase was found with XRD and SEM/EDS and quantified by Rietveld’s refining method. |
topic |
characterization tin dioxide praseodymium oxide tantalum oxide |
url |
http://186.233.154.254/ojs/index.php/ActaSciTechnol/article/view/17995 |
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