Identify the type of inorganic solids with complex structure that each of the following are:a) LiNiO2b) CaTiO3c) Fe3O4

1/ What is meant by the term coordination number in the structure of a solid? 2/ How does the coordination number depend on the structure of the metal?

1. The co-ordination number of metal crystallizing in a hexagonal close packed structure is (a) 12 (b) 4 (c) 8 (d) 6

Iron titanate, FeTiO3, forms in the ilmenite crystal structure that consists of an HCP arrangement of O2- ions. (a) Which type of interstitial site will the Fe2+ ions occupy? (b) Which type of interstitial site will the Ti4+ ions occupy? (c) What fraction of the total tetrahedral sites will be occupied? (In decimal form to two places to the right of the decimal) (d) What fraction of the total octahedral sites will be occupied? (In decimal form to two places to the right of the decimal)

What temperature will be needed to heat treat copper such that the concentration of vacancies per cm3 produced will be 10 times more than the equilibrium concentration of vacancies per cm3 at room temperature (250C)? Assume that 83.68 Joule are required to produce a mole of vacancies in copper

5. What is meant by the term coordination number in the structure of a solid? How does thecoordination number depend on the structure of the metal?

Why are there no more than 7 crystal systems ? What are quasicrystals ?

3

A unit cell of Re03 consists of a cubic .1 arrangement of Re atoms with O atoms centred along each edge of the cube. The coordination number of each Re atom is

sketch a tetragonal unit cell, and within that cell indicate locations of the 1/2 1 1/2 and 1/4 1/2 3/4 point coordinates