Prerequisites for understanding defects in crystals

    Hello EveryOne, So about crystal defects, I am not sure if I can complete the chapter by this weekend or not. I had to go through a lot of old question papers to clearly understand what all must be studied to complete the portion of this chapter. All I can tell you is, the notes from study material is not sufficient at all. 

    The prerequisites  for studying the material in the study material are as follows as per me:

1. What are crystalline structures? What is lattice? What is unit cell?
2. Study about the 7 crystal systems. Study about the 14 Bravias lattices
3. Understand the concept of Miller indices. Find miller indice for a given plane. Sketch a plane when miller indices are given.
4. Understand about crystal directions. Find crystal directions when miller indices are given.
5. Find out the relation between radius of atom and parameter of lattice in a Bravias lattice. Find out the no. of atoms in a given lattice. Find out the no. of atoms in sq. mm. of cube
6. Find out Atomic Packing Factor. Know how to calculate the density of cube using Avagordo's Number.

    Yeah, I must say I made some progress in this chapter anyway. I know a little about everything I listed above and practiced some problems on the same.

     A note about questions from these topics in old papers. The questions are given here. Do try to solve them.

1. Calculate volume of FCC unit cell in terms of atomic radius. (W-05)
2. Show that Atomic Packing Factor of FCC unit cell is greater than the Atomic Packing Factor of BCC unit cell. (W-05)
3. Calculate the Atomic Packing Factor of a FCC unit cell. (W-06)
4. If lattice parameter of alpha iron is 286 pm, find out the atomic radius (W-06).

    There is a lot more to study including types of defects and the effects of these defects on the structure intensive properties of crystalline materials .... Everything happens at a pace. All we can do is, improve the pace. Thats what I intend to do this time.

Don't forget to grab a copy of Material Science and Engineering book, which is essential for preparing for AMIE, Material Science.

Shall keep you posted

with warm regards

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