Dodecacalcium hepta-aluminate

Dodecacalcium hepta-aluminate

Crystal structure of C12A7[1]
Names
Other names
C12A7; mayenite; Tetradecaaluminum dodecacalcium tritriacontaoxide
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/14Al.12Ca.33O/q14*+3;12*+2;33*-2
    Key: WAUBKNFRIUQIER-UHFFFAOYSA-N
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Properties
Ca12Al14O33
Molar mass 1,386.66 g·mol−1
Appearance Clear to black solid, depending on synthesis and doping[2]
Density 2.68 g·cm−3
Melting point 1,400 °C (2,550 °F; 1,670 K)
1.614–1.643[3]
Structure
Cubic
I43d
a = 1.1989 nm[4]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Dodecacalcium hepta-aluminate (12CaO·7Al2O3, Ca12Al14O33 or C12A7) is an inorganic solid that occurs rarely in nature as the mineral mayenite. It is an important phase in calcium aluminate cements and is an intermediate in the manufacture of Portland cement. Its composition and properties have been the subject of much debate, because of variations in composition that can arise during its high-temperature formation.[5]

  1. ^ Hosono, H.; Tanabe, K.; Takayama-Muromachi, E.; Kageyama, H.; Yamanaka, S.; Kumakura, H.; Nohara, M.; Hiramatsu, H.; Fujitsu, S. (2015). "Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides". Science and Technology of Advanced Materials. 16 (3): 033503. arXiv:1505.02240. Bibcode:2015STAdM..16c3503H. doi:10.1088/1468-6996/16/3/033503. PMC 5099821. PMID 27877784.
  2. ^ Cite error: The named reference b2 was invoked but never defined (see the help page).
  3. ^ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1997). "Mayenite". Handbook of Mineralogy (PDF). Vol. III (Halides, Hydroxides, Oxides). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209724.
  4. ^ Grandfield, John (2014). Light Metals 2014. Wiley. p. 78. ISBN 978-1-118-88840-7.
  5. ^ Taylor, H F W (1990) Cement Chemistry, Academic Press, ISBN 0-12-683900-X, pp. 36–38