Difference Between Tetrahedral and Octahedral Voids

Tetrahedral void is a simple triangular void in a crystal and is surrounded by four spheres arranged tetrahedrally around it. On the other hand, an octahedral void is a double triangular void with one triangle vertex upwards and the other triangle vertex downwards and is surrounded by six spheres.

1. What are tetrahedral and octahedral voids?
2. Which void is bigger octahedral or tetrahedral?
3. How will you distinguish between the following pairs of terms tetrahedral and octahedral voids?
4. How are tetrahedral and octahedral voids are formed?
5. Where are octahedral voids located?
6. Which is the largest void in solid state?
7. How octahedral voids are formed?
8. How many tetrahedral voids are there in BCC?
9. How will you distinguish between HCP and CCP?
10. How do you distinguish between crystal lattice and unit cell?
11. How do you distinguish between hexagonal close packing and cubic close packing structures?

What are tetrahedral and octahedral voids?

A simple triangular void 'c' which is surrounded by four spheres is called as tetrahedral void. The double triangular void like 'd' which is surrounded by six spheres is called as octahedral void.

Which void is bigger octahedral or tetrahedral?

No. The octahedral voids are bigger in size than tetrahedral one.

How will you distinguish between the following pairs of terms tetrahedral and octahedral voids?

(iii) Tetrahedral void : The void between three spheres in direct contact capped by fourth sphere is called tetrahedral void. The coordination number of tetrahedral void is 4. Octahedral void : Th void between three spheres in direct contact capped by three more spheres in direct contact is called octahedral void.

How are tetrahedral and octahedral voids are formed?

These are the voids. As you see that tetrahedral voids are triangular in shape. When two such voids combine, from two different layers they form an octahedral void. So when the tetrahedral void of the first layer and the tetrahedral void of the second layer align together, they form an octahedral void.

Where are octahedral voids located?

Other than the body center there is one of the octahedral voids at the center of each of the 12 edges Which is surrounded by 6 atoms, four belonging to the same unit cell and two belonging to two other adjacent unit cells.

Which is the largest void in solid state?

Hence, the largest void is cubic void.

How octahedral voids are formed?

The atom in the octahedral void is in contact with six atoms placed at six corners of an octahedron. This void is formed when two sets of equilateral triangles pointing in the opposite direction with six spheres. ... If the number of close-packed spheres is N, then the number of octahedral voids is N.

How many tetrahedral voids are there in BCC?

A BCC has 6 octahedral holes and 12 tetrahedral holes. At each face of the bcc, there is one octahedral hole. There is also an octahedral hole on each edge.

How will you distinguish between HCP and CCP?

HCP and CCP structures both consist of layers of closest packed planes of atoms. Atoms in both structures have coordination numbers of 12. However the HCP structure contains only two types of planes, with an alternating .. ... A CCP structure contains three types of planes, with an alternating ..

How do you distinguish between crystal lattice and unit cell?

Unlike crystal lattice, a unit cell has a definite volume and a specific number of points. Therefore a crystal lattice and unit cell coexist in a three-dimensional representation of atoms, ions or molecules in a crystal.

How do you distinguish between hexagonal close packing and cubic close packing structures?

The hexagonal close packing is denoted as HCP. This arrangement has two layers of spheres in one repeating unit. The key difference between hexagonal close packing and cubic close packing is that, a unit cell of hexagonal close packing has 6 spheres whereas a unit cell of cubic close packing has 4 spheres.