Na2Ca~AI6Si90Jo.8Hp. M; = 1164•9, orthorhombic. Fdd2, Cl =. 18•4049 (8), b = 56•655 (6), c r-; 6•5443 (4)A, V=6823•94A3, Z=8, D.= 2•27 g cm-l, .{(Mo Ku) = O• 7093 A, f-l = 9•4 cm-I, spherical cr yst al, T = 294 K. F(OOO) = 4688, R (P) = 0•032, 5267 reflcctions, The mesolite structure has complete Si/AI ordcr alle! the same frarnework topology as natrolite and scolccite. The Na atom coordinatcs four O atoms and two water O atoms in a distorted trigonal prisrn (Na-O 2.40-2•74, Na-OW 2•34A) and the Ca atorn coordinatcs Iour frarnework O atoms and thrce water O atoms in a distorted pentagonal bipyrarnid (Ca-O 2•S(}-2•54, Ca-OW 2•31-2-36 A). H atorns werc located for each of the four independent warcr rnolccules. Thc hydrogen-bonding systcm is gener ally similar to the arrangernents found in natrolite and scolcciie. Thc local gcornetry of the water molcculcs adapis to thc frarncwork distortions.
X-ray structure refinement of mesolite, Na2Ca2Al6Si9O80×8H2O
ARTIOLI, GILBERTO;
1986
Abstract
Na2Ca~AI6Si90Jo.8Hp. M; = 1164•9, orthorhombic. Fdd2, Cl =. 18•4049 (8), b = 56•655 (6), c r-; 6•5443 (4)A, V=6823•94A3, Z=8, D.= 2•27 g cm-l, .{(Mo Ku) = O• 7093 A, f-l = 9•4 cm-I, spherical cr yst al, T = 294 K. F(OOO) = 4688, R (P) = 0•032, 5267 reflcctions, The mesolite structure has complete Si/AI ordcr alle! the same frarnework topology as natrolite and scolccite. The Na atom coordinatcs four O atoms and two water O atoms in a distorted trigonal prisrn (Na-O 2.40-2•74, Na-OW 2•34A) and the Ca atorn coordinatcs Iour frarnework O atoms and thrce water O atoms in a distorted pentagonal bipyrarnid (Ca-O 2•S(}-2•54, Ca-OW 2•31-2-36 A). H atorns werc located for each of the four independent warcr rnolccules. Thc hydrogen-bonding systcm is gener ally similar to the arrangernents found in natrolite and scolcciie. Thc local gcornetry of the water molcculcs adapis to thc frarncwork distortions.Pubblicazioni consigliate
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