Problem 1. Consider a crystal with HCP structure, having an ideal c/a ratio. Complete parts (a)-(c)...

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Chemistry

Problem 1. Consider a crystal with HCP structure, having anideal c/a ratio. Complete parts (a)-(c) below.

(a) (1.0 pt max) Demonstrate that the ideal c/a ratio equals 26/3.

(b)(0.5 pt max) Find the volumeof one unit cell for a given a value.

(c) (0.5 pt max) Demonstrate thatthe atomic packing factor for this crystal structure is 2/6.

Hints: (a) The c/a ratio isconsidered ideal when the distance from some atom to its nearestneighbors within the same hexagonally-packed layer equals thedistance to its nearest neighbors belonging to a differentlayer.

(b) The volume of a prism is theproduct of the area of its base face and the height. Use the c/aratio found in part (a).

(c) Find the relationship betweenthe lattice constant a and the atomic radius R to calculate the APFvalue. Use the unit cell volume found in part (b)

Answer & Explanation Solved by verified expert
3.7 Ratings (667 Votes)
a The ideal axialratio ca for a hexagonal closepacked crystal structurecan be calculated by considering noninteracting    See Answer
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