4.1: Unit Cells (Problems)
- Page ID
- 98699
PROBLEM \(\PageIndex{1}\)
Describe the crystal structure of iron, which crystallizes with two equivalent metal atoms in a cubic unit cell.
- Answer
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The structure of this low-temperature form of iron (below 910 °C) is body-centered cubic. There is one-eighth atom at each of the eight corners of the cube and one atom in the center of the cube.
PROBLEM \(\PageIndex{2}\)
Describe the crystal structure of Pt, which crystallizes with four equivalent metal atoms in a cubic unit cell.
- Answer
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This structure of platinum is a face-centered cubic. There is one-eighth atom at each of the eight corners of the cube and one-half atom on each of the six faces of the cube.
PROBLEM \(\PageIndex{3}\)
What is the coordination number of a chromium atom in the body-centered cubic structure of chromium?
- Answer
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eight
PROBLEM \(\PageIndex{4}\)
What is the coordination number of an aluminum atom in the face-centered cubic structure of aluminum?
- Answer
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12
Contributors
Paul Flowers (University of North Carolina - Pembroke), Klaus Theopold (University of Delaware) and Richard Langley (Stephen F. Austin State University) with contributing authors. Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution License 4.0 license. Download for free at http://cnx.org/contents/85abf193-2bd...a7ac8df6@9.110).
- Adelaide Clark, Oregon Institute of Technology