Questions
Game: Identify the planes
Quick questions
You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!
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Which one of the following statements about the (
4 ) and (2 1) planes is false? -
Does the [1
2] direction lie in the (30 ) plane? -
When writing the index for a set of symmetrically related planes, which type of brackets should be used?
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Which of the <110> type directions lie in the (112) plane?
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What is the common direction between the (1
) and ( 33) planes? -
Which set of planes in a cubic-close-packed structure (such as copper) is close packed?
Open-ended questions
The following questions are not provided with answers, but intended to provide food for thought and points for further discussion with other students and teachers.
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Practice sketching some lattice planes. Make sure you can draw the {100}, {110} and {111} type planes in a cubic system.
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Draw the trace of all the (
21) planes intersecting a block 2 × 2 × 2 block of orthorhombic (a ≠ b ≠ c, α = β = γ = 90°) unit cells. -
Sketch the arrangement of the lattice points on a {111} type plane in a face centred cubic lattice. Do the same for a {110} type plane in a body centred cubic lattice. Compare your drawings. Why do you think the {110} type planes are often described as the "most close packed" planes in bcc?