Microstructural development during cooling and its influence on the dielectric properties of barium- and niobium-doped TiO2 ceramics
| Autor: | Jenn-Ming Wu, Hsiao-Miin Sung |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Materials science
Precipitation (chemistry) Mechanical Engineering Mineralogy Sintering chemistry.chemical_element Barium Dielectric Abnormal grain growth Condensed Matter Physics Microstructure chemistry Mechanics of Materials visual_art Phase (matter) visual_art.visual_art_medium General Materials Science Ceramic Composite material |
| Zdroj: | Materials Science and Engineering: B. 3:265-272 |
| ISSN: | 0921-5107 |
| Popis: | The effect of cooling rates on the microstructural development and on the dielectric properties of barium- and niobium-doped TiO 2 ceramics was investigated. It was found that extensive abnormal grain growth occurred in the cooling period after sintering. The extent of the abnormal grain growth had a maximum in certain intermediate cooling rates. The abnormal grain growth was thought to be caused by non-uniform precipitation of the BaTi 4 O 9 second phase during cooling. The amount of precipitated second phase and the resulting dielectric properties depended strongly on the rate of cooling. |
| Databáze: | OpenAIRE |
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