Barium nitrite – ammonia compositions for activating barium titanate cold sinteringстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 15 апреля 2026 г.
Аннотация:A novel approach for activating the cold sintering of barium titanate (BaTiO3) ceramics involves the in-situ formation of barium hydroxide. This is achieved by the preliminary addition of barium nitrite monohydrate to the initial BaTiO3 powder in an amount of 10.7-13.4 mol%, along with the incorporation of aqueous ammonia into the mold prior to the cold sintering process. Utilizing submicron BaTiO3 powder with an average particle size of 0.32 μm and the newly developed activating composition, tetragonal ceramics with an average grain size of 0.40-0.42 μm and a relative density of up to 95.2% were successfully produced. The ceramics exhibited a homogeneous microstructure and contained no more than 1.5 wt% of BaCO3 impurities. Notably, the relative dielectric constant of the synthesized BaTiO3 ceramics reached 1886, with a dielectric loss tangent of 0.066 at room temperature and a field frequency of 1 kHz.