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Gordina, N. E.; Prokof’ev, V. Yu; Shamanaeva, N. V.; Borisova, T. N.; Konstantinova, E. M.; Voinova, V. V.
Glass and ceramics, 05/2020, Volume: 77, Issue: 1-2Journal Article
The behavior of the mixtures 6Al 2 Si 2 O 7 : 12NaOH and 6Al 2 Si 2 O 7 : 12NaOH : 2Al 2 O 3 during heat-treatment was studied by means of x-ray diffraction and simultaneous thermal analysis. It was shown that hydrated zeolite LTA forms after ultrasonic treatment and evaporation of a suspension, granulation of paste, and drying. It was determined that sodium aluminum silicate Na6Al 4 Si 4 O 17 is synthesized at temperatures up to 700°C. Sodium aluminum silicate Na 8 Al 4 Si 4 O 18 , mullite, and nepheline were found in the systems after heat-treatment at temperatures above 800°C. It is shown that the calculations performed by Friedman’s isoconversion method (differential) and the Kissinger–Akahir–Sunose (integral) method, for which the temperature interval 500 – 800°C is of interest, give close values of E . The growth of the apparent energy of activation with increasing degree of transformation attests a change in the reaction mechanism.
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