Low-temperature sintering characteristics of nano-sized BaNd2Ti5O14 and Bi2O3–B2O3–ZnO–SiO2 glass powders prepared by gas-phase reactions

Nano-sized BaNd2Ti5O14 (BNT) powders were prepared by spray pyrolysis from solutions containing ethylenediaminetetraacetic acid and citric acid. Treatment at temperatures ≥900 °C and subsequent milling resulted in nanoparticle powders with orthorhombic crystal structures. The mean particle size of the powder post-treated at 1000 °C was 160 nm. Nano-sized Bi2O3–B2O3–ZnO–SiO2 glass powder with 33 nm average particle size was prepared by flame spray pyrolysis and used as a sintering agent for the BNT. BNT pellets sintered at 1100 °C without the glass had porous structures and fine grain sizes. Those similarly sintered with the glass had denser structures and larger grains.

Graphical abstractNano-sized BaNd2Ti5O14 and Bi2O3–B2O3–ZnO–SiO2 glass powders were prepared by new concept process. Ethylenediaminetetraacetic acid and citric acid were applied as the chelating agents for nano-sized BaNd2Ti5O14 powders in the spray pyrolysis. Nano-sized Bi2O3–B2O3–ZnO–SiO2 glass powder of average size 33 nm was prepared by flame spray pyrolysis. Nano-sized glass powders had good properties as the sintering agent for BaNd2Ti5O14.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights▶ Nano-sized BaNd2Ti5O14 powder was prepared by spray pyrolysis from solution containing chelating agents. ▶ Nano-sized Bi2O3–B2O3–ZnO–SiO2 glass powder was prepared by flame spray pyrolysis as sintering agent for BaNd2Ti5O14. ▶ Nano-sized glass powders had good properties as the sintering agent for BaNd2Ti5O14.