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Journal of Thermal Analysis and Calorimetry

, Volume 138, Issue 3, pp 2275–2282 | Cite as

The peculiarities of mayenite formation from synthetic katoite and calcium monocarboaluminate samples in temperature range 25–1150 °C

  • A. Eisinas
  • T. Dambrauskas
  • K. BaltakysEmail author
  • K. Ruginyte
Article
  • 70 Downloads

Abstract

In this work, the formation and thermal stability of mayenite by using two-step synthesis in a 25–1150 °C temperature range was examined. It should be indicated that, within 1 h of hydrothermal treatment (130 °C; CaO/Al2O3 = 1.714, w/s = 10), katoite and calcium monocarboaluminate were obtained. Meanwhile, the largest quantity of the latter compound was formed already after 4 h of isothermal curing. In the next stage of this work, the calcination of synthesis products was performed. It was observed that after 1 h of thermal treatment at 150 °C temperature, the crystal structure of calcium monocarboaluminate was destroyed and at a slightly higher temperature (240 °C), gibbsite was fully decomposed. Also, peaks of other calcium carbonate forms, aragonite, were observed. It should be indicated that katoite recrystallized to mayenite at 310 °C. The results of in situ XRD experiment showed that, when the temperature of calcination was increased to 600 °C, aragonite became metastable and started to recrystallize to calcite, which fully decomposed to calcium oxide at 900 °C. Besides, the intensity of diffraction maximums typical to mayenite increased in 850–1150 °C temperature range.

Keywords

Mayenite Hydrothermal synthesis Calcination Calcium monocarboaluminate 

Notes

Acknowledgements

This research is funded by the European Social Fund under the No 09.3.3-LMT-K-712 “Development of Competences of Scientists, other Researchers and Students through Practical Research Activities” measure.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • A. Eisinas
    • 1
  • T. Dambrauskas
    • 1
  • K. Baltakys
    • 1
    Email author
  • K. Ruginyte
    • 1
  1. 1.Department of Silicate TechnologyKaunas University of TechnologyKaunasLithuania

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