CMY 716: Lecture 4 and 5 Comprehensive Exam Questions With Elaborated Answers.
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Course
CMY
Institution
CMY
What is a space group? - correct answer a group of symmetry operations which leave the infinitely extended, regularly repeating pattern of a crystal unchanged
Draw the space groups P1 bar, P2, Pm and give equivalent positions - correct answer ...
CMY 716: Lecture 4 and 5
What is a space group? - correct answer a group of symmetry operations which
leave the infinitely extended, regularly repeating pattern of a crystal unchanged
Draw the space groups P1 bar, P2, Pm and give equivalent positions - correct answer
pg. 26
Draw the space groups P2 subscript 1, P2/m, C2, C222, P222, P4 subscript 1 and give equivalent
positions - correct answer London
Draw the space groups P2 subscript 1/m, P2 subscript 1/c and P2/c and give equivalent positions -
correct answer London
Draw the space groups Cm and Cc and give equivalent positions - correct answer
London
What are equivalent positions? - correct answer The objects (the motifs) related by
symmetry within the unit cell take up what are called general equivalent positions
What are special positions? - correct answer 1. Positions that coincide with a
symmetry element.
2. e.g. (0,0,0) coincides with an inversion centre.
3. ONLY special positions for inversion, rotation, lattice conditions, mirrors and NOT screw axes
- because screw axes have a translational component.
NB! Exercise 1 and 2! - correct answer Handouts
What are Miller indices used for? - correct answer Used to distinguish between
different directions in a plane
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