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Calcium aluminate glasses are important materials where AlO -  4/2  is the only network former. Aluminum in crystals or glasses between CaO and Al 2 O 3  can have different environments as a function of the CaO/Al 2 O 3  ratio. Using X-ray absorption at the Al K- and L-edges, Raman and  27 Al NMR spectroscopies, we have determined the structural surroundings of Al in glasses, crystals, and melts in this binary system. Aluminum is in octahedral coordination at high-Al 2 O 3  content (&gt;80 mol%) and essentially in fourfold coordination with 4 bridging O atoms (BOs) at Al 2 O 3  contents between 30 and 75 mol%. At around 25 mol% Al 2 O 3 , Al is in tetrahedral coordination with two BOs. The presence of higher-coordinated species at high-Al 2 O 3  contents and their absence at low Al 2 O 3  imply different viscous flow mechanisms for high- and low-concentration Al 2 O 3  networks.

american mineralogist

The structure of crystals, glasses, and melts along the CaO-Al 2 O 3  join: Results from Raman, Al L- and K-edge X-ray absorption, and  27 Al NMR spectroscopy