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
Expertsmind.com offers Performing Numeric Computation matlab assignment help MATLAB contains numbers, precise, and technological innovation features to support all common tech

numericals

THE INVERTER ('NOT' GATE) Figure shows the symbol for an inverter, where the output will produce the complement of the input. This device is often employed when the complement

A project has a first cost of $2000. There is another cost at the end of year 1 of $500 and the income for year 3 until 6 year is $1000 per year. If the compounding is quarterly, c

Testing After Install After installation of a propeller, the engine must be ground run in order to check the propeller for correct function and operation.  Aircraft propeller in


What''s the principles of surveying?

function ismember - set operations: The function ismember receives two vectors as input arguments, and returns a logical vector which is of similar length as the first argumen

HYBRID IC: Hybrid IC's are formed by utilizing various combinations of monolithic, thin-film and thick film techniques and may in certain circumstances contain discrete semicon

I want to make a model on kinematics need help.