Sintering and electrical conductivity of doped WO3

✍ Scribed by V.O. Makarov; M. Trontelj

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 494 KB
• Volume: 16
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/0955-2219(95)00204-9

✦ Synopsis

The influence of a series of oxide additives, namely AlJO,, Co,O,, MnO, and Na,O, on the sintering capacity und electrical conductivity of WO,-based binury ceramic systems was studied The densification behaviour and the microstructures obtained after firing were dependent on the additive oxide type. A small addition of NazO shifts the onset of sintering to lower temperatures, whereas the addition of Al,O, shift the onset of sintering to higher temperatures compared with unhoped WO,. The inhibition of grain growth was observed in A&O,-doped WO,. The electrical conductivity of these WO, ceramics depends on the additive oxide type and varies in the range from 2 X l@' to 9 x I@' a-' cm'. The WOs--Na,O system was found to exhibit non-lirs4ar current-voltage characteristics and a low breakdown voltage. The non-linearity coeficient of the current-voltage characteristics of the Na20-doped W03 ceramics increases with sintering temperature and attains a maximum value of around 5.