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Unit cell of Ca 2 SiO 4. Color code: red (O), blue (Ca), gold (Si). As verified by X-ray crystallography, calcium silicate is a dense solid consisting of tetrahedral orthosilicate (SiO 4 4-) units linked to Ca 2+ via Si-O-Ca bridges. There are two calcium sites. One is seven coordinate and the other is eight coordinate. [11]
Heulandite subgroup – (Na,Ca,K) 5−6 [Al 8−9 Si 27−28 O 72]·nH 2 O; Hsianghualite – Ca 3 Li 2 (Be 3 Si 3 O 12)F 2; Laumontite – CaAl 2 Si 4 O 12 ·4H 2 O; Mordenite – (Na 2,Ca,K 2) 4 (Al 8 Si 40)O 96 ·28H 2 O; Nabesite – Na 2 BeSi 4 O 10 ·4H 2 O; Natrolite subgroup Natrolite – Na 2 Al 2 Si 3 O 10 ·2H 2 O; Gonnardite – (Na ...
Calcium monosilicide (Ca Si) is an inorganic compound, a silicide of calcium. It can be prepared by reacting elemental calcium and silicon at temperatures above 1000 °C. [ 3 ] It is a Zintl phase , where silicon has oxidation state −2 and covalence 2.
Again there is variation in composition: magnesium silicide is represented by Mg 2 Si, [9] calcium silicide can be represented by Ca 2 Si, CaSi, CaSi 2, Ca 5 Si 3 and by Ca 14 Si 19, [10] strontium silicide can be represented by Sr 2 Si, SrSi 2 and Sr 5 Si 3 [11] and barium silicide can be represented by Ba 2 Si, BaSi 2, Ba 5 Si 3 and Ba 3 Si 4 ...
Calcium disilicide (Ca Si 2) is an inorganic compound, a silicide of calcium. It is a whitish or dark grey to black solid matter with melting point 1033 °C. It is insoluble in water, but may decompose when subjected to moisture, evolving hydrogen and producing calcium hydroxide. It decomposes in hot water, and is flammable and may ignite ...
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The atomic (or molar) ratio Ca/Si, CaO/SiO 2, or C/S, and the number of water molecules can vary and the above-mentioned stoichiometry may differ. Many pozzolans may also contain aluminate , or Al(OH) 4 − , that will react with calcium hydroxide and water to form calcium aluminate hydrates such as C 4 AH 13 , C 3 AH 6 or hydrogarnet , or in ...
[4] [5] [6] Dehydrating the latter yields a hard translucent form of silica with atomic-scale pores, called silica gel, which is widely used as water absorbent and drying agent. Silica dissolves very sparingly in water [citation needed] and is present in seawater at concentrations below 100 parts per million. In such dilute solutions, silica is ...