Q.33 (1) What is the co-ordination number in 2D hexagonal close packing.
(ii) What is F- Centre.
(iii) What are schottky defect.
please answer ASAP
Answers
Answer:
1) Coordination Number and Number of Atoms Per Unit Cell
In a unit cell, an atom's coordination number is the number of atoms it is touching. The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell.
2) An F-center, Farbe center or color center is a type of crystallographic defect in which an anionic vacancy in a crystal lattice is occupied by one or more unpaired electrons. Electrons in such a vacancy tend to absorb light in the visible spectrum such that a material that is usually transparent becomes colored.
3) In the Schottky defect, two ions of opposite sign leave the lattice. Impurity defects are foreign atoms that replace some of the atoms making up the solid or that squeeze into the interstices; they are important in the electrical behaviour of semiconductors, which are materials used in…