Redetermination of the structure of β-dicalcium silicate

Ab InitioCalculations for the Substitutions of Al(OH)-4and SO2-4with Si Tetrahedra

“…The same assumptions as in the substitution of Al(OH) − 4 with paired Si tetrahedra have been contemplated to calculate the potential energy surface by relaxing the bond lengths of Si (2) (a) 1 • and ∼1.63Å, respectively, elsewhere. 25,26) The calculated geometrical parameters are found to be comparable with these reported values. The total energy obtained in the optimized structure of each molecule is also shown in the corresponding figure.…”

“…25,26,28) It is observed that Si-O and S-O bond distances decrease for the substitution of SO Fig. 4(e).…”

Mechanism of stabilization of dicalcium silicate solid solution with aluminium

“…The -form is a metastable monoclinic phase at room temperature. 18 The -phase, is stable at ambient temperature and it crystallizes in an orthorhombic olivine-type structure [19][20][21][22] , but is essentially nonreactive with water. ' L and ' H orthorhombic phases are stable at high temperatures.…”

La forme β du dichlorure de calcium tétrahydraté

“…Par contre elle est h la limite de la plus grande distance Ca-O(NO 7) (2,85 A) observ6e dans ces m~mes nitrates de calcium. De plus Jost, Ziemer & Seydel (1977), dans leur 6tude Dans les dichlorures de calcium hydrat6s dont les structures sont connues, le pont entre deux atomes de calcium est 6tabli de diverses fa9ons: il se far soit par les mol6cules d'eau (CaClz.6H20 , Leclaire & Borel, 1977b) soit par les ions chlore (CaC12. 2H20 , Leclaire & Borel, 1977a), soit par les deux (CaCl2.4HEOfl), alors que dans les hydrates du nitrate de calcium (Leclaire, 1976) …”