Toward a new PTCR material based on the Na2Ti6O13/Na2Ti3O7 system

[Display omitted] •A new PTCR material based on a mixed phase of sodium titanate is report.•A model based on the structural composition of the system is proposed.•The resistivity at room temperature can be tune by slightly modifying the structure and microstructure of the system.•Unprecedented physi...

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Bibliographic Details
Published in:Materials research bulletin 2021-08, Vol.140, p.111311, Article 111311
Main Authors: Basilio, L.A.L., Silva, J.H.L., Xavier, F., Aguilera, L., Guerrero, F., Antonelli, E., Anglada-Rivera, J., Garcia, J.E., Silva, R.S., Leyet, Y.
Format: Article
Language:English
Subjects:
Laser sintering
PTCR
Resistivity
Sodium titanate
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Summary:[Display omitted] •A new PTCR material based on a mixed phase of sodium titanate is report.•A model based on the structural composition of the system is proposed.•The resistivity at room temperature can be tune by slightly modifying the structure and microstructure of the system.•Unprecedented physical properties and Novel functionalities for sodium-titanate based ceramics system. Mixed phases of sodium titanate ceramics are obtained using both conventional and laser sintering methods. It was observed a clear dependence on the structural, microstructural and electrical resistivity with the employed sintering method. The temperature dependence of the resistivity in the ceramics shows an increase of three orders of magnitude in a narrow range of temperatures, thereby indicating a noticeable positive temperature coefficient of resistivity (PTCR) effect. To explain this observed abnormal behavior, a model based on the structure of the Na2Ti6O13/Na2Ti3O7 composite is proposed. A new class of PTCR materials is reported.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2021.111311