Electrical Characteristics of Bismuth Titanate Ceramics and Glass-Ceramics, Containing SiO2 and Nd2O3 as Additives
| Autor: | Svetlin B. Parvanov, Stanislav S. Slavov, Yanko Dimitriev, E. Kashchieva, M. Krapchanska |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Mechanical Engineering Bismuth titanate Mineralogy Conductivity Microstructure Crystal chemistry.chemical_compound chemistry Mechanics of Materials Electrical resistivity and conductivity visual_art visual_art.visual_art_medium General Materials Science Dielectric loss Thermal stability Ceramic Composite material |
| Zdroj: | Key Engineering Materials. 538:233-237 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.538.233 |
| Popis: | Bismuth-titanate ceramics containing SiO2and Nd2O3as additives are synthesized by melt quenching method in the system Bi2O3-TiO2-Nd2O3-SiO2at temperature 1450 oC. By X-ray diffraction analysis are determined the crystal phases participating in the materials: Bi4Ti3O12, Bi12TiO20and δ-Bi2O3. The addition of SiO2allows to control the glass formation ability of the supercooled melts. The addition of Nd2O3stimulates the thermal stability of the materials due to formation of solid solutions Bi4-xNdxTi3O12. Measurements of the electrical conductivity, capacitance and dielectric losses of selected samples are performed by DC resistible bridge and digital capacity meter (with frequency of 1 kHz) using two-terminal method and a suitable sample holder with graphite electrodes. It is established that for the investigated samples the activation energy of conductivity is in the range 1 – 1,3 eV, dielectric permittivity from 1000 to 3000 at (at 400 oC) and dielectric losses tgδ are between 0,0002 and 0,1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|