Gurmeet Singh posted an Question
November 04, 2020 • 21:19 pm 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

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    [hkl] and {hkl} are same sir?

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    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.

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    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}

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    sir do we have any example. as e.g for cubic it is - (111).

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    but when { hkl } can use

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    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)

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    Rahul kumar best-answer

    Answer: indicates the family of direction. [uvw] indicates zone axis. (hkl) and {hkl} indicates the face i.e. a plane.

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    [ uvw] and < uvw > are same things.?

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    [uvw] indicates zone axis i.e. a single direction. Family of direction is indicated by symbol.

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