Unit-cell parameters and the space group of a new phase of dicalcium silicate (Ca2SiO4) were determined by using powder X-ray diffractometry and selected-area electron diffraction techniques. This phase could be synthesized via the dissociation of hydrothermally synthesized α-Ca2(SiO4H)OH at temperatures of ∼500°-920°C, Crystallographic data for the sample synthesized at 600°C were as follows: Ca2SiO4, monoclinic; P21/c space group; lattice parameters of a = 0.82147(9) nm, b = 0.9808(1) nm, c = 0.9741(1) nm, and β = 94.642(7)°; cell volume (V) of 0.7857(1) nm 3; Z = 8 (where Z is the number of chemical formula units in a unit cell); and a density of 2.91 g/cm 3. The cristallographic data for samples synthesized at 800°C had slightly different unit-cell parameters of a = 0.82124(6) nm, b = 0.97348(7) nm, c = 0.97935(7) nm, β = 94.831(5)°, and V = 0.7849(1) nm 3. Structural relationships of the new phase with the other dicalcium silicates are discussed.
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1998 May|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry