Facultatea de Fizică
Universitatea "Al.I.Cuza" Iaşi
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| Titlu: PTCR effect in n-doped BaTiO3 ceramics |
| Autori: Cristina Fedor Ciomaga and Liliana Mitoseriu |
| Afiliere: Dept. of Electricity and Electronics, Al. I. Cuza University, Faculty of Physics,Bvd. Carol 11, Iasi 6600, Romania |
| Abstract: A theoretical approach based on the double depletion layer model (Heywang-Jonker) and Landau-Devonshire theory of ferroelectricity were used for describing the ferroelectricsemiconductor properties of the Positive Temperature-Coefficient of Resistivity (PTCR) materials, in particular n-doped BaTiO3. The resistivity vs. temperature dependences are described in the whole range of temperatures, including near the ferroelectric-to-paraelectric phase transition. The role of the donor concentration, density of electron traps and surface state energy on the PTCR parameters were analysed and discussed in connection with the processing parameters. |
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