Thermal Expansion of 12CaO°7Al2O3
- 1 October 1987
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 70 (10) , C‐288-C‐291
- https://doi.org/10.1111/j.1151-2916.1987.tb04902.x
Abstract
Literature data for the 12CaO°7Al2O3 phase show certain discrepancies in the structure, thermal stability, and mean linear thermal expansion obtained by different techniques. Phase‐pure, cubic, polycrystallin I2CaO°7Al2O3 was synthesized by annealing a stoichiometric melt in air. Infrared spectrophotometry indicated stabilization by moisture. Differential thermal analysis and thermogravimetric analysis showed the cubic phase to be stable up to at least 1200° C. High‐temperature X‐ray diffraction analysis of a polycrystalline sample and dilatometric measurement of sintered pellets indicated a linear thermal expansion of 41 × 10‐7 to 43X10‐7/°C in the temperature range 200° to 800°C.Keywords
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