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Distinguish between (i) Hexagonal and monoclinic unit cells. (ii) Face-centred and end-centred unit cells. |
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Answer» Solution : For hexagonal unit cell, a =B `ne`C,`alpha=BETA=90^@, gamma= 120^@` For monoclinic unit cell, `a ne b ne c , alpha = gamma = 90^@,beta ne =90^@` (ii) A face-centred unit cell has ONE constituent particle present at the centre of each face in addition to the particles present at the CORNERS . An end-face centred has one constituent particle each at the centre of any two opposite faces in addition to the particles present at the corners |
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