Abstract
The crystallization kinetics and phase developments of PbO-BaO-SrO-Nb 2O5-B2O3-SiO2 based glass-ceramics have been investigated. Lead strontium barium niobate, (Pb,Sr,Ba)Nb2O6, with a tetragonal tungsten-bronze structure formed as the major crystalline phase, which showed evidence of both surface and bulk crystallization. The results of the present study showed significant evidence of a change in crystallization mechanism between as-heated surface and interior of glass-ceramics. Such effects could be attributed to a volatilization of PbO taken place readily on the surface region of sample during heating. The grain size of the bulk-nucleated (Pb,Sr,Ba)Nb 2O6 crystals was substantially much smaller than that of surface-nucleated crystals. This result facilitated to meet the high energy density capacitor application due to ultra-fine grains (< 60 nm) obtained. The dielectric constant increased from 27 for the as-quenched glass to 200 for a highly crystallized glass-ceramics, which was attributed to a significant volume fraction of PSBN phase.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 151-166 |
| Number of pages | 16 |
| Journal | Ceramic Transactions |
| Volume | 167 |
| State | Published - 2005 |
| Event | 106th Annual Meeting of the American Ceramic Society - Indianapolis, IN, United States Duration: Apr 18 2004 → Apr 21 2004 |
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry