Bibliographic Details
| Title: |
Potential Barrier Behavior of BaTiO3—(Bi0.5Na0.5)TiO3 Positive Temperature Coefficient of Resistivity Ceramic. |
| Authors: |
Leng Sen-Lin1 lengsenlin@sohu.com, Shi Wei1, Li Guo-Rong2, Zheng Liao-Ying2 |
| Source: |
Chinese Physics Letters. Apr2015, Vol. 32 Issue 4, p1-1. 1p. |
| Subjects: |
Potential barrier, Barium titanate, Polycrystals, Temperature coefficient of electric resistance, Thermistors, Ceramic materials, Capacitance-voltage characteristics |
| Abstract: |
High-Curie-temperature (Tc) lead-free Y-doped 90 mol%BaTiO3—10 mol%(Bi0.5Na0.5)TiO3 ceramic with positive temperature coefficient of resistivity (PTCR) is prepared by the conventional solid state reaction in nitrogen atmosphere. The PTCR ceramic exhibits a room-temperature resistivity (ρ25) of ∼500Ω·cm and a high PTCR effect (maximum resistivity (ρmax)/minimum resistivity (ρmin)) of ∼4.5 orders of magnitude. A capacitance-voltage approach is first employed to calculate the potential barrier (Φ) of the grain boundary of PTCR ceramic above Tc. It is found that the potential barrier changes from 0.17 to 0.77 eV as the temperature increases from 180 to 220°C, which is very close to the predictions of the Heywang–Jonker model, suggesting that the capacitance-voltage method is valid to estimate the potential barrier of PTCR thermistor ceramics. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
