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Old 19th November 2016, 06:31 PM
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Default Crystal Structure VTU

Hii sir, I wants to get the Notes on the Engineering Physics Unit 7 Crystal Structure of the VTU University ?
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Old 19th November 2016, 07:12 PM
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Default Re: Crystal Structure VTU

As you Asking for the Notes on the Engineering Physics Unit 7 Crystal Structure of the VTU University is given below

Solids are of two types: Amorphous and crystalline. In amorphous solids, there is no order in the arrangement of their constituent atoms (molecules). Hence no definite structure could be assigned to them.

A substance is said to be crystalline when the arrangement of the units (atoms, molecules or ions) of matter inside it is regular and periodic.

Space lattice:
An array of points which describe the three dimensional arrangement of particles (atoms, molecules or ions) in a crystal structure is called space lattice. Here environment about each point should be identical.

Basis:
A crystal structure is formed by associating with every lattice point a unit assembly of atoms or molecules identical in composition. This unit assembly is called basis.

A crystal structure is formed by the addition of a basis to every lattice point.
i.e., lattice + Basis = crystal structure.
Thus the crystal structure is real and the crystal lattice is imaginary.

Bravais lattice:
For a crystal lattice, if each lattice point substitutes for an identical set of one or more atoms, then the lattice points become equivalent and the lattice is called Bravais lattice. On the other hand, if some of the lattice points are non-equivalent, then it is said to be a non-Bravais lattice.

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