Magnetic properties of Crystals :- Each electron in an atom behaves like a magnet. It’s magnetic moment originates from two types of motions are orbital motion around the nucleus and spin around its own axis. Magnitude of magnetic moment is very small and is measured in the unit called Bohr magneton μB. It is equal…
Conductors:- The solids with conductivities ranging between 10⁴ to 10⁷ ohm⁻¹ m⁻¹ are called conductors. Examples. – Metals like Iron, Copper, Sodium etc. Insulators :- Semiconductors :- These are the solids with conductivities in the intermediate range from 10⁻⁶ to 10⁴ ohm⁻¹ m⁻¹· Examples. – Silicon and Germenium shows this behaviour called intrinsic semiconductor. Types…
A solid consists of an aggregation of large number of small crystals, these small crystals have defects in them which are called defects in crystals. The defects in crystals are basically irregularities in the arrangement of constituent particles. Types of defects in crystals :- The defects in crystals are of mainly two types:- ( a…
Atomic radius :- Thus, the edge length or side of the cube a and the atomic radius of each particle r are related as a = 2 r r = a / 2 In ∆ EFD, b² = a² + a² = 2a b = √2 a Now in ∆ AFD c² = a² +…
In Crystals, the constituent particles are close packed and leaving the minimum vacant space. In such a situation, the entropy of crystalline material becomes minimum. Let us consider the constituent particles as identical hard spheres and build up three dimensional structure in following three steps – Close Packing in one Dimension :- There is only…
W. H. Miller in 1839 represented the planes of a crystal by a set of three integers h, k and l, called the Miller indices. To obtained the Miller indices for any crystal plane, the ratios of the intercepts made by the unit plane to those made by the given plane or its parallel plane…
Theoretical Density :- Knowing the unit cell dimensions, the theoretical density d of a cubic crystal can be calculated from the equation d = Z M / N V where Z is the number of atoms in the unit cell, M is the molar mass, V is the volume of the unit cell and N…
Crystal Lattice :- If the three dimensional arrangement of constituent particles like atoms, molecules or ions in a crystal is represented diagrammatically, in which each particle is depicted as a point, the arrangement is called crystal lattice. In 1848, Auguste Bravais showed with the help of geometrical calculations that there are 14 possible three dimensional…
Solid state :- Types of Solid :- On the basis of the nature of order present in the arrangement of their constituent particles, Solid or solid state can be classified as Crystalline and Amorphous. Crystalline Solid :- A crystalline solid state usually consists of a large number of small crystals, each of them having a…
