An x-ray diffraction study of the kinetics of formation of barium-calcium aluminates and tungstates

The Influence of Ageing Process on the Barium Aluminate Phase Composition

“…Solutions of aluminum nitrate and barium nitrate and sodium carbonate with given concentrations were supplied from tanks (1, 2) to the reactor (6) through the thermostat (5) by peristaltic pumps (3,4). Precipitation was carried out at room temperature.…”

“…In [4], the method for obtaining active substances was used by coprecipitation components, which formed barium-calcium aluminates and barium-calcium tungstates at subsequent firing of the precipitate. This technique has several advantages: rapidity of the reaction, the minimum amount of impurities.…”

Technology Development of Continuous Synthesis of Active Substance for Dispenser Cathode

“…Solutions of aluminum nitrate and barium nitrate and sodium carbonate with given concentrations were supplied from tanks (1, 2) to the reactor (6) through the thermostat (5) by peristaltic pumps (3,4). Precipitation was carried out at room temperature.…”

“…Recently, some new technologies for chemically pure substances synthesis such as the nitrate crystallization technique [1], the method of spray-type drying [2,3], sol-gel technique have been used for dispenser cathodes manufacturing. In the article [4] active substance obtains by combined precipitation of components which form aluminates and tungstate at subsequent calcination of precipitate. In this case, the aluminate formation reaction proceeds much faster than with the classical method.…”

"Investigação do processo de obtenção de aluminatos de bário e cálcio para construção e caracterização de catodos termiônicos impregnados para aplicação em dispositivos de microondas de potência"

“…Maklakov [52]. Determinaram-se os elementos presentes nos aluminatos obtidos pelas diferentes técnicas de síntese.…”