Back to Search
Start Over
Fabrication and operation limit of lead-free PTCR ceramics using BaTiO3–(Bi1/2Na1/2)TiO3 system.
- Source :
- Journal of Electroceramics; Feb2009, Vol. 22 Issue 1-3, p263-269, 7p
- Publication Year :
- 2009
-
Abstract
- Abstract  The electric properties of BaTiO3–(Bi1/2Na1/2)TiO3 (BT–BNT) solid solution ceramics were studied as a lead-free PTCR (positive temperature coefficient of resistivity) thermistor material usable over 130°C. For determining the maximum switching temperature T s, the phase diagram of BT–BNT binary system was clarified. Two semiconductorization processes and their electric properties are described. The lanthanum(La)-doped BBNT ceramics sintered in air still showed dielectric behaviors, but the niobium(Nb)-doped ones had a low resistivity at room temperature, ρ RT, on the order of 103 Ωcm and showed a PTC behavior. Sintering under a low O2 atmosphere produces BT–BNT ceramics with less than 102 Ωcm compared to those prepared in air. Our current research produced the BBNT ceramics with T s values around 210°C by increasing the (Bi1/2Na1/2) content in the ceramics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13853449
- Volume :
- 22
- Issue :
- 1-3
- Database :
- Complementary Index
- Journal :
- Journal of Electroceramics
- Publication Type :
- Academic Journal
- Accession number :
- 36532787
- Full Text :
- https://doi.org/10.1007/s10832-007-9398-6