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Sandeep Kumar posted an Question
April 28, 2020 • 16:54 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Which type of disorted voids present in hexagonal close packing in 3d? effect of schottky defect on conductance and dielectric constant of solid?

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    Dinesh khalmaniya 1 best-answer

    1. Voids literally mean gaps between the constituent particles. Voids in solid states mean the vacant space between the constituent particles in a closed packed structure. Close packing in solids can be generally done in three ways: 1D close packing, 2D close packing and 3D close packing. In 2 dimensional structures when the atoms are arranged in square close packing and hexagonal close packing, we see empty spaces left over between the atoms. These empty spaces are called voids and in the case of hexagonal packing, these voids are in triangular shapes and are known as the triangular voids. The size and distribution of voids in materials plays a role in determining In the close packed crystals (FCC, HCP) there are two types of voids - tetrahedral and octahedral voids (identical in both the structures as the voids are formed between two layers of atoms). If there are N atom pr unit cell the total tetra voids = 2N and Octahedral voids = N 2. the electrical conductivity depends on the no. of ions and as we know that in Schottky defects usually anions gets displaced from their original position resulting in increased electrical conductivity. In frenkel defect the cations are displaced to interstitial sites and thus conductivity remains same.

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