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प्रश्न
How will you distinguish between the following pair of terms?
Tetrahedral and octahedral voids
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उत्तर
| Tetrahedral void | Octahedral void | |
| 1. | The tetrahedral void is the name given to the vacant space formed by the touching of four spheres, as shown in the figure. |
Octahedral voids are formed by the combination of voids of two triangular layers of atoms when one triangular layer is placed above another, as shown in the figure. |
| 2. | A tetrahedral void is surrounded by 4 atoms arranged at the corners of a tetrahedron. | An octahedral void is surrounded by 4 atoms arranged at the corners of an octahedron. |
| 3. | Found in close-packed structures like fcc and hcp. | Only present in close-packed structures. |
| 4. | Smaller in size compared to octahedral voids. | Larger in size than tetrahedral voids. |
| 5. | Number of tetrahedral voids = 2 × number of atoms in the lattice | Number of octahedral voids = equal to number of atoms in the lattice |
संबंधित प्रश्न
If the radius of the octahedral void is r and the radius of the atoms in close packing is R, derive the relation between r and R.
The unit cell of a substance has cations A+ at the corners of the unit cell and the anions B− at the center. The simplest formula of the substance is ____________.
A compound is formed by two elements A and B. The element B forms cubic close packing and atoms of A occupy `1/3"rd"` of tetrahedral voids. The formula of this compound is ____________.
If AgI crystallises in zinc blende structure with I– ions at lattice points. What fraction of tetrahedral voids is occupied by Ag+ ions?
In which of the following crystals alternate tetrahedral voids are occupied?
The number of octahedral voids present in a lattice is A. The number of closed packed articles, the number of tetrahedral voids generated is B the number of closed packed particles:
In the hexagonal close-packed structure of a metallic lattice, the number of nearest neighbours of a metallic atom is ____________.
The coordination number of Y will be in the XY types of crystal:
The number of tetrahedral voids per unit cell in NaCl crystal is:
(i) 4
(ii) 8
(iii) twice the number of octahedral voids.
(iv) four times the number of octahedral voids.
Show that in a cubic close packed structure, eight tetrahedral voids are present per unit cell.
