CBSE Class 12 Chemistry Notes – Chapter 1 DEFECTS IN CRYSTALS

An ideal crystal is a crystal which has the same unit cell containing the same lattice points throughout the whole of the crystal. At absolute zero, most of the ionic crystals show no defects. With the increase of temperature, chances of one or more of the lattice sites remaining unoccupied by the ions increase. This constitutes a defect. The number (n) of such defects per cm3 is given by the equation-

n = N x e-w/2RT

Where, N= total number of sites per cm3, w= work or energy required to produce a defect, T= absolute temperature, R = gas constant and e is base of natural logarithm.

What is absolute zero temperature?

Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in the substance. By international agreement, absolute zero is defined as precisely, 0 Kelvin on Kelvin scale and -273.15 degrees Celsius on the Celsius scale.

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