Space Lattice and Basis in Crystal Structure
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Questions and Answers

What is the lattice used to describe?

  • The structure of ionic crystals
  • The defects in non-ionic crystals
  • The arrangement of points in space (correct)
  • The arrangement of atoms in a crystal

    • What is the term for the smallest group of atoms with the overall symmetry of a crystal?

  • Primitive unit cell
  • Lattice
  • Defect
  • Unit cell (correct)

    • What is the definition of Packing Fraction (P.F) in a unit cell?

  • Fraction of space occupied by atoms in a unit cell (correct)
  • Regular arrangement of points in space
  • Number of lattice points per unit cell
  • Number of atoms per unit cell

    • Which term refers to the three sides of the unit cell?

    <p>Primitives</p> Signup and view all the answers

    What is the basis of a crystal structure?

    <p>Group of atoms in a fixed arrangement</p> Signup and view all the answers

    What are OX, OY, OZ referred to as in crystallography?

    <p>Lattice parameters</p> Signup and view all the answers

    Which branch of science focuses mainly on the internal structure of crystals?

    <p>Crystallography</p> Signup and view all the answers

    What is the distinguishing feature of a single crystal compared to a polycrystalline solid?

    <p>Repeats periodicity over its whole volume</p> Signup and view all the answers

    Which type of crystal is characterized by comprising many individual grains that can be thought of as single crystals?

    <p>Polycrystalline solid</p> Signup and view all the answers

    In crystallography, what information does crystal structure provide?

    <p>Pattern of atoms/molecules within a material</p> Signup and view all the answers

    Which type of crystal has the interest primarily focused on its external shape?

    <p>Crystalline</p> Signup and view all the answers

    What distinguishes single crystals from polycrystalline solids in terms of their periodicity?

    <p>Single crystals repeat periodicity over their whole volume</p> Signup and view all the answers

    What is the term used to describe the angle between the sides a and c in a crystallographic structure?

    <p>β</p> Signup and view all the answers

    How many fundamentally different types of unit cells are there based on their relative edge lengths and angles?

    <p>7</p> Signup and view all the answers

    Who devised a system known as Miller indices to specify planes in a crystal?

    <p>W.H. Miller</p> Signup and view all the answers

    How many Bravais lattices are there in total, combining primitive and non-primitive types?

    <p>14</p> Signup and view all the answers

    In which lattice structure does the condition 'a≠ b ≠ c' hold true?

    <p>Triclinic</p> Signup and view all the answers

    What does the term 'anisotropic' refer to in relation to physical properties of crystalline solids?

    <p>Dependence on directions within the crystal</p> Signup and view all the answers

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