The Tetragonal Crystal System Minimally Requires One Four-Fold Rotation Axis

question 22

Multiple Choice

The tetragonal crystal system minimally requires one four-fold rotation axis. Which of the following conditions on unit-cell edges and angles would satisfy this?

• A) a=b=c, a=b=g=90°
• B) a=b¹c, a=b=g=90°
• C) a=b=c, a=b=g¹90°
• D) a and b
• E) a and c

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