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http://hdl.handle.net/20.500.12128/8235
Tytuł: | The Positive Temperature Coefficient of Resistivity Effect in the Pb(Fe1=2Nb1=2)O3 Ceramics Admixed with Lithium |
Autor: | Bochenek, Dariusz |
Słowa kluczowe: | ferroelektryczność; antyferroelektryczność; przejścia fazowe; punkt Curie; straty i relaks dielektryczny |
Data wydania: | 2009 |
Źródło: | Acta Physica Polonica A, Vol. 116, nr 3 (2009), s. 268-270 |
Abstrakt: | In the paper technological conditions were looked for to obtain the Pb(Fe1=2Nb1=2)O3 (PFN) ceramics and
the PFN ceramics with the lithium admixture with the highest electric conduction and conditions appropriate
for the PTC-R effect formation. Measurements of dc electrical resistivity, dielectric permittivity and dielectric
loss were made as functions of temperature from room temperature to 190±C, at 1 kHz. The best set of values of
dielectric loss and dielectric constant, from the ferroelectricity point of view, were obtained when the precursor
with orthorhombic structure was employed. By creating appropriate technological conditions in the PFN ceramics
the PTC-R effect can occur above the Curie temperature. Their electric properties are determined by presence of
a basic phase of the potential barrier on the grain boundaries. |
URI: | http://hdl.handle.net/20.500.12128/8235 |
ISSN: | 0587-4246 |
Pojawia się w kolekcji: | Artykuły (WNŚiT)
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