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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
November 05, 2020 • 02:49 am
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30 points
30 points
- IIT JAM
- Geology (GG)
119. a family of direction is represented by: a (hkl) c. (hkl b. uvw>
119. A family of direction is represented by: A (hkl) C. (hkl B. uvw> D. [uvw] (BHU-2014) atomic diameter of an RRC cmstal it
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Sajan sarthak Best Answer
A set of directions related by symmetry operations of the lattice or the crystal is called a family of directions. A family is a symmetry related set. A family of directions is represented (Miller Index notation) as: < u v w > . Note the brackets are important
[hkl] and {hkl} are same sir?
No gurmeet,zone symbol ([UVW]) The symbol which defines the position of the zone axis of a crystal with respect to the crystallographic reference axes of the mineral. It is enclosed in square brackets to indicate that it refers to a line and not a plane.
crystallography there are conventions as to how the indices of planes and directions are written. When referring to a specific plane, "round" brackets are used: (hkl) When referring to a set of planes related by symmetry, then "curly" brackets are used: {hkl}
sir do we have any example. as e.g for cubic it is - (111).
but when { hkl } can use
like if you denote {111} it defines octahedron form in Isometric system.. but in that octahedron if we take any single face we denote by ( 111)