Electrical properties of varistors in relation to their true bismuth composition after sintering
| Autor: | N Achard, M. Elkhatib, J. R. Vignalou, Renaud Metz, H. Delalu |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Metallurgy Spinel Pyrochlore Sintering chemistry.chemical_element Varistor Mineralogy Substrate (electronics) engineering.material Condensed Matter Physics Bismuth chemistry visual_art engineering visual_art.visual_art_medium General Materials Science Electrical measurements Ceramic |
| Zdroj: | Materials Chemistry and Physics. 63:157-162 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/s0254-0584(99)00227-8 |
| Popis: | New varistors compositions are often directly evaluated in relation to varistor electrical characteristics. The compositions are well known since it is easy to weigh with accuracy the single oxides raw materials. However, this paper emphasizes the fact that the compositions of ceramics used to carry out electrical measurements differ from green ceramics. For instance and depending on the conditions, it is shown that bismuth can be either vaporized or can diffuse inside the substrate during the sintering. To reduce the loss of material we suggested using a new route where ceramics are produced by mixture from pre-synthesized spinel and pyrochlore phases with the other classical single oxides additives such as Co, Mn, Cr, Ni, etc. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect