Abstract
We created a material with a composition gradient within each grain. Due to the graded composition the ceramic does not show a sharp change in dielectric constant near the relaxation frequency. Instead, we observe gradual decrease in dielectric constant with frequency, with the loss tangent remaining practically unchanged (below 0.02 everywhere within the frequency range 0.0003-3 GHz). The tunability of the ceramic decreases with increasing frequency but remains in the order of 10% at 3 GHz. Thus we conclude that the dielectric relaxation in high purity (Ba,Sr)TiO3 occurs predominantly by Ti4+ ion hopping relaxation. We also expect that the concept of intragrain concentration gradient ceramics may become a useful material for a wide range of electronic devices. PACS: 77.22.Gm, 77.22.Ch, 77.84.Dy
| Original language | English |
|---|---|
| Pages (from-to) | 1263-1267 |
| Number of pages | 5 |
| Journal | Journal of the European Ceramic Society |
| Volume | 22 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2002 |
| Externally published | Yes |
Bibliographical note
Funding Information:This material is based upon work supported by, or in part by, the US Army Research Office under contract/grant number DAAH04-96-1-0389. I.L. would like to express his gratitude for the support of the Rueff-Wormster Postdoctoral Fellowship.
Funding
This material is based upon work supported by, or in part by, the US Army Research Office under contract/grant number DAAH04-96-1-0389. I.L. would like to express his gratitude for the support of the Rueff-Wormster Postdoctoral Fellowship.
| Funders | Funder number |
|---|---|
| US Army Research Office | DAAH04-96-1-0389 |
Keywords
- (Ba,Sr)TiO
- Dielectric properties
- Gradient-composition
- Perovskites