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Thermal Expansion of 12CaO°7Al 2 O 3
Author(s) -
Datta R. K.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04902.x
Subject(s) - thermogravimetric analysis , thermal expansion , crystallite , analytical chemistry (journal) , differential thermal analysis , thermal stability , materials science , atmospheric temperature range , annealing (glass) , stoichiometry , diffraction , thermal analysis , phase (matter) , thermal , chemistry , thermodynamics , composite material , metallurgy , optics , chromatography , physics , organic chemistry
Literature data for the 12CaO°7Al 2 O 3 phase show certain discrepancies in the structure, thermal stability, and mean linear thermal expansion obtained by different techniques. Phase‐pure, cubic, polycrystallin I2CaO°7Al 2 O 3 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.