Which of the following is a close packed plane for the HCP crystal?
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A.
(10Ī1)
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B.
(Ī010)
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C.
(1Ī01)
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D.
(0001)
Correct Answer:
D. (0001)
Explanation:
In the hexagonal close-packed (HCP) crystal structure, the close-packed planes are the (0001) planes, also known as the basal planes. These planes represent the layers where atoms are most densely arranged in a hexagonal pattern, following an ABAB stacking sequence. While the options provided—(10-11), (-1010), and (1-101)—refer to other crystallographic planes within the hexagonal system, they do not possess the maximum atomic packing density required to be classified as close-packed planes. Therefore, the correct answer is D, as none of the specific Miller-Bravais indices listed in options A, B, or C represent the primary close-packed basal plane.
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