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Write Brief Answer · Q5

Q.Explain briefly seven types of unit cell.

Tamil Nadu DgeTextbookSubjectiveImportance★★★★★
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Step 1. Cubic: a=b=ca=b=c; α=β=γ=90∘\alpha=\beta=\gamma=90^\circ -- the most symmetric system (e.g. NaCl, diamond).

Step 2. Tetragonal: a=b≠ca=b\neq c; α=β=γ=90∘\alpha=\beta=\gamma=90^\circ -- one axis stretched relative to the other two equal axes.

Step 3. Orthorhombic: a≠b≠ca\neq b\neq c; α=β=γ=90∘\alpha=\beta=\gamma=90^\circ -- three unequal axes, all still at right angles.

Step 4. Hexagonal: a=b≠ca=b\neq c; α=β=90∘,γ=120∘\alpha=\beta=90^\circ, \gamma=120^\circ -- two equal axes at 120 degrees, with the third axis perpendicular.

Step 5. Monoclinic: a≠b≠ca\neq b\neq c; α=γ=90∘,β≠90∘\alpha=\gamma=90^\circ, \beta\neq90^\circ -- three unequal axes, with only one angle tilted away from 90 degrees (e.g. monoclinic sulphur).

Step 6. Triclinic: a≠b≠ca\neq b\neq c; α≠β≠γ≠90∘\alpha\neq\beta\neq\gamma\neq90^\circ -- the least symmetric system, all three axes and all three angles unequal. …

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