Why end Centred tetragonal is not possible?

Why end Centred tetragonal is not possible?

It is because face centered tetragonal lattice is redundant. To be recognized as unique lattice it should be unique and it should be in line with symmetry requirements of the crystal system. Violation of either disqualifies the given array of points as a unique lattice.

Why end Centred cubic unit cell is not possible?

In order to have end centered closed packing structure unit cell must possess vectors a≠b≠c, which is absent in case of cubic unit cell due to this cubic unit cell cannot possess end-centred closed packing. The highest symmetry possible for an end centered unit cell is tetragonal.

What is the difference between face Centred and end Centred unit cell?

A Face-centred unit cell the constituent particles are present at the corners and one at the centre of each face. An End-centred unit cell contains particles at the corners and one at the centre of any two opposite faces.

Is tetragonal FCC?

C-centred cubic does not exist it is reclassified into simple tetragonal. FCC remains (i.e. it is not classified as BCT) FCC has cubic symmetry (with three 4-folds rotation axes along the <111>). Face Centred Tetragonal (FCT) is reclassified as Body Centred Tetragonal (BCT) smaller reference unit cell.

Which is example of tetragonal system?

Graphite is an example of tetragonal crystal system.

What is the difference between face Centred and end-Centred unit cell?

How face-centered cubic cell formed?

A face-centered cubic unit cell structure consists of atoms arranged in a cube where each corner of the cube has a fraction of an atom with six additional full atoms positioned at the center of each cube face. The atoms at the corner of the cube are shared with eight other unit cells.

What does tetragonal mean in chemistry?

noting or pertaining to a system of crystallization in which all three axes are at right angles to one another, two being equal in length and the third being of a different length.

How many letters points are there in face Centred tetragonal?

(b) In face centred tetragonal, the number of lattice points is also the same i.e., 8 + 6 = 14.