Which premitive unit cell has unequal edge lengths (\(a \ne b \ne c\)) and all axial angles different from \(90^\circ\)?
Show Hint
- Hexagonal
- Tetragonal
- Triclinic
- Monoclinic
The Correct Option is C
Solution and Explanation
Hexagonal: \(a=b\ne c\), \(\alpha=\beta=90^\circ\), \(\gamma=120^\circ\).
Tetragonal: \(a=b\ne c\), all angles \(90^\circ\).
Monoclinic: \(a\ne b\ne c\), \(\alpha=\gamma=90^\circ\), \(\beta\ne 90^\circ\).
Triclinic: \(a\ne b\ne c\), \(\alpha\ne\beta\ne\gamma\ne 90^\circ\).
Answer: (3) Triclinic
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