ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The electrical properties and microstructures of SrTiO3 based voltage-sensing and dielectricdual-functional ceramics with nanometer donor and acceptor additives were studied. The La2O3 nanopowdersand MnO-SiO2-Al2O3 (or CuO-SiO2-Al2O3) nano-composite powders were incorporated intoSrTiO3 as donor, acceptor and liquid-phase sintering aids. Then semiconducting SrTiO3-based ceramicswere sintered at 1360-1440oC for 2 h in a reducing atmosphere. The effects of the nanometer donor andacceptor additives and the sintering temperature on the electrical properties and microstructures ofmaterials were discussed. The results showed that SrTiO3-based varistor ceramics with 1.1 mol% La2O3and 0.1 mol% MnO nano-additives sintered at 1360-1420oC in graphite and N2 reducing atmosphere haveexcellent voltage-sensing and dielectric characteristics. The varistor voltage ranges from 2.3 to 5.3 V/mm,the nonlinear coefficient from 3.0 to 3.8, and the dielectric constant from 215,600 to 413,000
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.793.pdf
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