tetrahedral voids

A simple triangular void in a crystal is surrounded by four spheres. fig 2.11 - A unit cell of simple cubic packing fig 2.11 - (a) Tetrahedral void..

A tetrahedral void may be represented in a cub..

Tetrahedral Voids - A simple triangular void in a crystal is surrounded by four spheres. fig 2.11 - A unit cell of simple cubic packing fig 2.11 - (a) Tetrahedral void..

Number of octahedral voids = Number of atoms present in the close packed arrangement Number of tetrahedral voids = 2 x Number of octahedral voids = 2 x Number of ato..

In the FeO structure two thirds of Fe 2 + ions (in the structure of FeO) are replaced by Fe 3 + ions. The remaining Fe 2 + ions and 50% of the Fe 3 + ions occupy the octahedral voids. The other 50% of the Fe 3 + ions occupy the tetrahedral voids..

They are compounds having the general formula AFe 2 O 4 where A is a divalent cation like Mg 2 + or Zn 2 + . They are obtained from Fe 3 O 4 by replacing Fe 2 + by divalent cations. These belong to a category with a general formula AB 2 O 4 where A is a divalent cation and B is a trivalent..

Zeolites are microporous aluminosilicates of general formula M x / n [AlO 2 ] x [SiO 2 ].mH 2 O and may be considered as open structures of silica in which aluminium has been substituted in a fraction x / (x+y) of the tetrahedral sites. The negative charge of the aluminosilicate framework..