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CMY 716: Lecture 4 and 5 Comprehensive Exam Questions With Elaborated Answers. R235,14   Add to cart

Exam (elaborations)

CMY 716: Lecture 4 and 5 Comprehensive Exam Questions With Elaborated Answers.

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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 ...

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  • October 8, 2024
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  • Exam (elaborations)
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  • CMY
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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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