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The crystal system of unit cell dimensio...

The crystal system of unit cell dimensions a=0.387, b=0.387 and c=0.504 nm and `alpha=beta=90^@` and `gamma=120^@` is

A

Triclinic

B

Orthorhombic

C

Cubic

D

Hexagonal

Text Solution

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The correct Answer is:
D
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The crystal system of a compound with unit cell dimensions a=0.387,b=0.387 and c=0.504 and alpha=beta=90^(@) and gamma=120^(@) is

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The crystal system of a compound with unit cell dimensions a = 0.388 , b = 0.388 and c = 0.506 nm and alpha = beta = 90^@ and gamma = 120^@ is

Tetragonal crystal system has the unit cell dimensions:

Tetragonal crystal system has the following unit cell dimensions :

Rhombohedral crystal system has the following unit cell dimensions :

The unit cell with crystallographic dimensions , a= b nec " and " alpha = beta=gamma = 90^0

Pick up the correct statement: (a) The crystal of AgBr does not have Schottky defect (b) The crystal system having crystal parameters, a = b != c, alpha= beta= 90^(@), gamma= 120^(@) is for a hexagonal unit cell (c) Ionic compounds having Frenkel defect, generally show a low radius ratio value. (d) The coordination number of Na^(+) ion in NaCl is 4

Assertion (A) : Graphite is an example of tetragonal crystal system. Reason (R ) : For a tetragonal system, a = b != c and alpha = beta = 90^(@), gamma = 120^(@) .

Example of unit cell with crystallographic dimensions a!=b!=c, alpha=beta=gamma=90^(@) is :

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