Influence of Oxygen Substoichiometry on the Dielectric Properties of BaTiO 3‐δ  Nanoceramics Obtained by Spark Plasma Sintering | Zendy

Voisin Christophe | Zendy; GuillemetFritsch Sophie | Zendy; Dufour Pascal | Zendy; Tenailleau Christophe | Zendy; Han Hyuksu | Zendy; Nino Juan C. | Zendy

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Influence of Oxygen Substoichiometry on the Dielectric Properties of BaTiO 3‐δ Nanoceramics Obtained by Spark Plasma Sintering

Author(s) -

Voisin Christophe,

GuillemetFritsch Sophie,

Dufour Pascal,

Tenailleau Christophe,

Han Hyuksu,

Nino Juan C.

Publication year - 2013

Publication title -

international journal of applied ceramic technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.4

H-Index - 57

eISSN - 1744-7402

pISSN - 1546-542X

DOI - 10.1111/ijac.12058

Subject(s) - materials science , spark plasma sintering , barium titanate , dielectric , ceramic , oxygen , ceramic capacitor , sintering , annealing (glass) , grain boundary , capacitor , composite material , chemical engineering , metallurgy , microstructure , optoelectronics , chemistry , organic chemistry , voltage , engineering , physics , quantum mechanics

Oxygen‐deficient BaTiO 3‐δ nanoceramics were prepared by spark plasma sintering. Partially reduced raw nanopowders led to unusual dielectric properties. A short postsintering treatment was performed to reach a high ε r /tan δ, which makes them attractive for industrial applications such as low‐frequency capacitors. Surprisingly, our ceramics also remained black even after annealing for 5 days at 850°C in air, indicating the presence of barriers against oxygen diffusion. This exceptional behavior in pure barium titanate was consistent with a core–shell structure made of semiconductive grains and insulating grain boundaries, due to the presence of Ti 3+ /Ti 4+ and oxygen vacancies.

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