General characteristics of solids General characteristics of solids
Amorphous and Crystalline Solids Examples, differences.
Classification of Crystalline Solids Based on binding forces: molecular solids – (non-polar, polar, H-bonded), ionic solids, metallic solids, covalent or network solids – examples
Crystal Lattices and Unit Cells Definitions – lattice point, crystal lattice, unit cell, coordination number
Number of Atoms in a Unit Cell Parameters of a unit cell, names of seven crystal systems, calculation of number of atoms in a cubic unit cell – simple cubic, bcc, fcc.
Closed Packed Structures Close packing in two dimensional and three-dimensional lattices – brief information, voids – types of voids, tetrahedral and octahedral and their relative numbers, calculation of the formula of the compounds based on the number of voids filled.
Packing Efficiency calculation of packing efficiency- fcc/ccp, bcc, simple cubic.
Calculations Involving Unit Cell Dimensions Formula to calculate the density of the unit cell to be assumed- use the formula to calculate a, d, z, M, NA. Numerical problems.
Imperfections in Solids Point defects-types, a brief account of Frenkel and Schottky defects, metal excess defect and metal deficiency defect with examples.
Electrical Properties Classification into conductors, insulators and semiconductors – their comparison based on band theory of metals, n- type and p-type semiconductors – differences and examples.
Magnetic Properties Paramagnetism, diamagnetism and ferromagnetism, examples.