A novel process termed low-temperature combustion-synthesis (LCS) ofBa(NO_3)_2-TiO_2-C_6H_8O_7.centre dot H_2O system was investigated at the initial temperature of 600deg C and ultrafine BaTiO_3 powders with a partic...A novel process termed low-temperature combustion-synthesis (LCS) ofBa(NO_3)_2-TiO_2-C_6H_8O_7.centre dot H_2O system was investigated at the initial temperature of 600deg C and ultrafine BaTiO_3 powders with a particle size of 200-350 nm were prepared. It was foundthat the molar ratio of NO_3^- / citric acid and the homogeneity of combustion have remarkableeffect on the characteristics of the powder. The reaction mechanism of LCS BaTiO_3 powders wasproposed on the basis of thermodynamic analysis.展开更多
Autoigniting synthesis of gel from Ba(NO_3)_2, TiO(NO_3)_2 and C_6H_8O_7centre dot H_2O aqueous solution was investigated at an initial temperature of 600 deg C andtetragonal BaTiO_3 nanopowder with particle size of 8...Autoigniting synthesis of gel from Ba(NO_3)_2, TiO(NO_3)_2 and C_6H_8O_7centre dot H_2O aqueous solution was investigated at an initial temperature of 600 deg C andtetragonal BaTiO_3 nanopowder with particle size of 80nm was prepared. It is indicated that thespecific surface area of the combustion product before and after calcinations is 14.74 m^2/g and12.49 m^2/g, respectively. The combustion wave is composed of solid phase reaction zone and gaseousphase flame reaction zone. The combustion flame temperature is 1 123 K derived from thermocouplemeasurement. The characteristics and densification behavior of the sol-gel autoigniting synthesizedBaTiO_3 nanopowder were investigated.展开更多
文摘A novel process termed low-temperature combustion-synthesis (LCS) ofBa(NO_3)_2-TiO_2-C_6H_8O_7.centre dot H_2O system was investigated at the initial temperature of 600deg C and ultrafine BaTiO_3 powders with a particle size of 200-350 nm were prepared. It was foundthat the molar ratio of NO_3^- / citric acid and the homogeneity of combustion have remarkableeffect on the characteristics of the powder. The reaction mechanism of LCS BaTiO_3 powders wasproposed on the basis of thermodynamic analysis.
文摘Autoigniting synthesis of gel from Ba(NO_3)_2, TiO(NO_3)_2 and C_6H_8O_7centre dot H_2O aqueous solution was investigated at an initial temperature of 600 deg C andtetragonal BaTiO_3 nanopowder with particle size of 80nm was prepared. It is indicated that thespecific surface area of the combustion product before and after calcinations is 14.74 m^2/g and12.49 m^2/g, respectively. The combustion wave is composed of solid phase reaction zone and gaseousphase flame reaction zone. The combustion flame temperature is 1 123 K derived from thermocouplemeasurement. The characteristics and densification behavior of the sol-gel autoigniting synthesizedBaTiO_3 nanopowder were investigated.
