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Potential Barrier Behavior of BaTiO3—(Bi0.5Na0.5)TiO3 Positive Temperature Coefficient of Resistivity Ceramic.

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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]
Copyright of Chinese Physics Letters is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Potential Barrier Behavior of BaTiO3—(Bi0.5Na0.5)TiO3 Positive Temperature Coefficient of Resistivity Ceramic.
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  Data: <searchLink fieldCode="AR" term="%22Leng+Sen-Lin%22">Leng Sen-Lin</searchLink><relatesTo>1</relatesTo><i> lengsenlin@sohu.com</i><br /><searchLink fieldCode="AR" term="%22Shi+Wei%22">Shi Wei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Li+Guo-Rong%22">Li Guo-Rong</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zheng+Liao-Ying%22">Zheng Liao-Ying</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Chinese+Physics+Letters%22">Chinese Physics Letters</searchLink>. Apr2015, Vol. 32 Issue 4, p1-1. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Potential+barrier%22">Potential barrier</searchLink><br /><searchLink fieldCode="DE" term="%22Barium+titanate%22">Barium titanate</searchLink><br /><searchLink fieldCode="DE" term="%22Polycrystals%22">Polycrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+coefficient+of+electric+resistance%22">Temperature coefficient of electric resistance</searchLink><br /><searchLink fieldCode="DE" term="%22Thermistors%22">Thermistors</searchLink><br /><searchLink fieldCode="DE" term="%22Ceramic+materials%22">Ceramic materials</searchLink><br /><searchLink fieldCode="DE" term="%22Capacitance-voltage+characteristics%22">Capacitance-voltage characteristics</searchLink>
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  Label: Abstract
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chinese Physics Letters is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/0256-307X/32/4/047202
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      – Code: eng
        Text: English
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      – SubjectFull: Potential barrier
        Type: general
      – SubjectFull: Barium titanate
        Type: general
      – SubjectFull: Polycrystals
        Type: general
      – SubjectFull: Temperature coefficient of electric resistance
        Type: general
      – SubjectFull: Thermistors
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      – SubjectFull: Ceramic materials
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      – SubjectFull: Capacitance-voltage characteristics
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      – TitleFull: Potential Barrier Behavior of BaTiO3—(Bi0.5Na0.5)TiO3 Positive Temperature Coefficient of Resistivity Ceramic.
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            NameFull: Leng Sen-Lin
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            NameFull: Shi Wei
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            NameFull: Li Guo-Rong
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              Text: Apr2015
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              Y: 2015
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