Thermochemical stability of zirconia-titanium nitride as mixed ionic-electronic composites

P. S. M. Silva, V. Esposito, D. Marani, D.Z. de Florio, I. F. Machado, F. C. Fonseca*

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Dense zirconia (8% molar yttria-stabilized ZrO2)-titanium nitride (TiN) composites are fabricated to obtain mixed ionic-electronic conducting ceramic systems with high degree of electronic and thermal conductivity. The composites are consolidated by spark plasma sintering (SPS), starting from pure powders of the pristine phases mixed in different ratios (TiN = 25, 50, 75 wt%). A careful optimization of the SPS conditions allows producing highly dense samples with no reaction between the phases or degradation by oxidation, thus maintaining the chemical integrity of the two phases. For all the composites, high electrical conductivity is attained. Samples exhibit metallic behavior, showing an unexpected percolation of TiN in the YSZ matrix for volume fraction ≤ 25 wt% (27 vol%). Chemical degradation and electrical properties of the compounds were monitored under oxidative (air) and inert (Ar) atmosphere at high temperatures. The oxidation kinetics of the nitride phase was inhibited by the microstructure of the composite. The electrical properties of such composites were explored at high temperature to evaluate its application in electrochemical devices. As results, it is shown that electrical transport properties of the composite can be tuned by both the relative volume fraction of phases and controlled oxidative treatments. Adjusting such parameters different electric behaviors were observed ranging from predominant electronic conductors, to temperature-independent resistivity, and semiconducting.
    Original languageEnglish
    JournalCeramics International
    Volume44
    Issue number7
    Pages (from-to)8440-8446
    ISSN0272-8842
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Yttria-stabilized zirconia
    • TiN
    • Composite
    • Spark plasma sintering
    • Mixed ionic-electronic conductors

    Cite this

    Silva, P. S. M. ; Esposito, V. ; Marani, D. ; Florio, D.Z. de ; Machado, I. F. ; Fonseca, F. C. / Thermochemical stability of zirconia-titanium nitride as mixed ionic-electronic composites. In: Ceramics International. 2018 ; Vol. 44, No. 7. pp. 8440-8446.
    @article{cfb74e655072453aa25725e89891d6db,
    title = "Thermochemical stability of zirconia-titanium nitride as mixed ionic-electronic composites",
    abstract = "Dense zirconia (8{\%} molar yttria-stabilized ZrO2)-titanium nitride (TiN) composites are fabricated to obtain mixed ionic-electronic conducting ceramic systems with high degree of electronic and thermal conductivity. The composites are consolidated by spark plasma sintering (SPS), starting from pure powders of the pristine phases mixed in different ratios (TiN = 25, 50, 75 wt{\%}). A careful optimization of the SPS conditions allows producing highly dense samples with no reaction between the phases or degradation by oxidation, thus maintaining the chemical integrity of the two phases. For all the composites, high electrical conductivity is attained. Samples exhibit metallic behavior, showing an unexpected percolation of TiN in the YSZ matrix for volume fraction ≤ 25 wt{\%} (27 vol{\%}). Chemical degradation and electrical properties of the compounds were monitored under oxidative (air) and inert (Ar) atmosphere at high temperatures. The oxidation kinetics of the nitride phase was inhibited by the microstructure of the composite. The electrical properties of such composites were explored at high temperature to evaluate its application in electrochemical devices. As results, it is shown that electrical transport properties of the composite can be tuned by both the relative volume fraction of phases and controlled oxidative treatments. Adjusting such parameters different electric behaviors were observed ranging from predominant electronic conductors, to temperature-independent resistivity, and semiconducting.",
    keywords = "Yttria-stabilized zirconia, TiN, Composite, Spark plasma sintering, Mixed ionic-electronic conductors",
    author = "Silva, {P. S. M.} and V. Esposito and D. Marani and Florio, {D.Z. de} and Machado, {I. F.} and Fonseca, {F. C.}",
    year = "2018",
    doi = "10.1016/j.ceramint.2018.02.039",
    language = "English",
    volume = "44",
    pages = "8440--8446",
    journal = "Ceramics International",
    issn = "0272-8842",
    publisher = "Pergamon Press",
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    }

    Thermochemical stability of zirconia-titanium nitride as mixed ionic-electronic composites. / Silva, P. S. M.; Esposito, V.; Marani, D.; Florio, D.Z. de ; Machado, I. F. ; Fonseca, F. C.

    In: Ceramics International, Vol. 44, No. 7, 2018, p. 8440-8446.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Thermochemical stability of zirconia-titanium nitride as mixed ionic-electronic composites

    AU - Silva, P. S. M.

    AU - Esposito, V.

    AU - Marani, D.

    AU - Florio, D.Z. de

    AU - Machado, I. F.

    AU - Fonseca, F. C.

    PY - 2018

    Y1 - 2018

    N2 - Dense zirconia (8% molar yttria-stabilized ZrO2)-titanium nitride (TiN) composites are fabricated to obtain mixed ionic-electronic conducting ceramic systems with high degree of electronic and thermal conductivity. The composites are consolidated by spark plasma sintering (SPS), starting from pure powders of the pristine phases mixed in different ratios (TiN = 25, 50, 75 wt%). A careful optimization of the SPS conditions allows producing highly dense samples with no reaction between the phases or degradation by oxidation, thus maintaining the chemical integrity of the two phases. For all the composites, high electrical conductivity is attained. Samples exhibit metallic behavior, showing an unexpected percolation of TiN in the YSZ matrix for volume fraction ≤ 25 wt% (27 vol%). Chemical degradation and electrical properties of the compounds were monitored under oxidative (air) and inert (Ar) atmosphere at high temperatures. The oxidation kinetics of the nitride phase was inhibited by the microstructure of the composite. The electrical properties of such composites were explored at high temperature to evaluate its application in electrochemical devices. As results, it is shown that electrical transport properties of the composite can be tuned by both the relative volume fraction of phases and controlled oxidative treatments. Adjusting such parameters different electric behaviors were observed ranging from predominant electronic conductors, to temperature-independent resistivity, and semiconducting.

    AB - Dense zirconia (8% molar yttria-stabilized ZrO2)-titanium nitride (TiN) composites are fabricated to obtain mixed ionic-electronic conducting ceramic systems with high degree of electronic and thermal conductivity. The composites are consolidated by spark plasma sintering (SPS), starting from pure powders of the pristine phases mixed in different ratios (TiN = 25, 50, 75 wt%). A careful optimization of the SPS conditions allows producing highly dense samples with no reaction between the phases or degradation by oxidation, thus maintaining the chemical integrity of the two phases. For all the composites, high electrical conductivity is attained. Samples exhibit metallic behavior, showing an unexpected percolation of TiN in the YSZ matrix for volume fraction ≤ 25 wt% (27 vol%). Chemical degradation and electrical properties of the compounds were monitored under oxidative (air) and inert (Ar) atmosphere at high temperatures. The oxidation kinetics of the nitride phase was inhibited by the microstructure of the composite. The electrical properties of such composites were explored at high temperature to evaluate its application in electrochemical devices. As results, it is shown that electrical transport properties of the composite can be tuned by both the relative volume fraction of phases and controlled oxidative treatments. Adjusting such parameters different electric behaviors were observed ranging from predominant electronic conductors, to temperature-independent resistivity, and semiconducting.

    KW - Yttria-stabilized zirconia

    KW - TiN

    KW - Composite

    KW - Spark plasma sintering

    KW - Mixed ionic-electronic conductors

    U2 - 10.1016/j.ceramint.2018.02.039

    DO - 10.1016/j.ceramint.2018.02.039

    M3 - Journal article

    VL - 44

    SP - 8440

    EP - 8446

    JO - Ceramics International

    JF - Ceramics International

    SN - 0272-8842

    IS - 7

    ER -