Crystallographic notation, Other Engineering

Q. What do you understand by crystallographic notation of atomic planes/Explain with the help of examples.

Ans.Crystallographic Notation

1. Crystal Symmetry:                   2: Miller Indices

1. Crystal Symmetry: The symmetry of a crystal indicates that in a lattice if the parts of an ideal crystal are interchange, the various direction are geometrically equivalent. The unit atomic groups also have like properties just like the original crystal. Symmetry of a crystal form is determined by the position of similar faces, diagonals etc.

    (a)Symmetry plane: If we cut the crystal along the plane which divides it into two similar halves so that one half is the reflection of the other half, such a plane is called plane of symmetry.

     (b)Centre of symmetry: It is point in a crystal which is equidistant from all the faces of the crystal. If a line is a drawn from this, it shows a reflection through a point instead of a reflection in a plane.

A crystal may have one or more axis or plane of symmetry is only one.

Symmetry Axis: The axis of symmetry is the imaginary line-passing through the centre of the crystal, about which the crystal may be rotated so that, it presents an identical appearance more than once in the course of rotation.

2. Miller indicates                                                                                                                 

     Some characteristics of miller indicate are:

  1. A plane which is parallel to any one of coordinate's axes has an intercept of infinity and thus, the miller index for that axis is zero.
  2. Miller indices do not only define a particular plain but a set of parallel plane.
  3. Only the ratio of indices is important.
  4. if (h,k,l)are the miller indices of a plane, then the plane cuts the axes into a/h,b/h and c/l equal segment respectively.
  5. All the parallel equidistant planes have the same miller indices, therefore the miller indices define a set of parallel planes.
  6. A plane parallel to one of the coordinate axes has an intercept of infinity.
Posted Date: 8/1/2012 8:51:03 AM | Location : United States







Related Discussions:- Crystallographic notation, Assignment Help, Ask Question on Crystallographic notation, Get Answer, Expert's Help, Crystallographic notation Discussions

Write discussion on Crystallographic notation
Your posts are moderated
Related Questions
Essentially, the strategy of CFD is to replace the continuous problem domain with a discrete domain using a grid domain with a discrete domain using a grid. In a continuous doma

can liquid reciever determine amount f refrigerant charged into the system

Turbine cooling  Airflow: Figure illustrates the turbine cooling airflow of a typical gas turbine engine. The outward flow of cooling air is controlled by air seals of multi-g

Exhaust Jet Mixing: Figure shows that the noise from the exhaust jet is the main contributor to the total noise generated by a low by-pass ratio turbo-fan. For a turbo-jet the

NOR Gate: Figure shows a further example of a 2 input digital gate, again consisting of two NPN transistors, TR1 and TR2, in a different configuration. When input A and input

2. Write a MATLAB program to perform discounted reward value iteration. Show me the MATLAB code and also an output from your code for solving the problem provided in the data above


general energy equation, non- flow energy equation, steady flow equation, joule''s law

how can we find local attraction correction?

Q. 1 A 50 cm diameter pipeline in the Arctic Carries hot oil at 30 0C and exposed to a coefficient surrounding temperature of -20 0C. Special powder insulation 5 cm thick surround