Influence of V2O5 substitutions to Bi2(Zn1/3Nb2/3)2O7 pyrochlore on sintering temperature and dielectric properties
| Autor: | Geun Kyu Choi, Kug Sun Hong, Dong Wan Kim, Seo Yong Cho |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Materials science
Process Chemistry and Technology Inorganic chemistry Pyrochlore Analytical chemistry Vanadium chemistry.chemical_element Dielectric engineering.material Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Bismuth vanadate Materials Chemistry Ceramics and Composites engineering Dielectric loss High-κ dielectric Monoclinic crystal system Solid solution |
| Zdroj: | Ceramics International. 30:1187-1190 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2003.12.034 |
| Popis: | The dielectric properties of the monoclinic zirconolite-like structure compound, Bi 2 (Zn 1/3 Nb 2/3 − x V x ) 2 O 7 (0≤ x ≤0.1), were investigated. We found a small vanadium substitution ( x ) to Bi 2 (Zn 1/3 Nb 2/3 ) 2 O 7 ceramics lowered sintering temperature from 950 to 850 °C. Low-temperature sintered Bi 2 (Zn 1/3 Nb 2/3 − x V x ) 2 O 7 maintained high dielectric constant ( e r ), ∼80 and Qxf value, ∼3000 at 6 GHz. By increasing x , second phase, bismuth vanadate (Bi 4 V 2 O 11 ) was detected. The formation of second phase is accompanied by a significant decrease in dielectric loss. It was found that Bi 2 (Zn 1/3 Nb 2/3 ) 2 O 7 had two phases, one was for the stoichiometric composition and the other was for Bi-deficient composition. The chemical compatibility of silver electrode and Bi 2 (Zn 1/3 Nb 2/3 − x V x ) 2 O 7 ( x =0.005) has also been investigated using SEM micrograph and EDS line scan of the interface between a silver electrode and the ceramic body, for low-temperature cofired ceramics (LTCC) applications. |
| Databáze: | OpenAIRE |
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