Bravias Lattices

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Bravias Lattices:

To represent the crystal structure, the three dimension arrangement of points is called ----.

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space lattice

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The French mathematician Bravias showed from geometrical consideration that there can be only --- different ways in which similar points can be arranged in ---space.

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• 14
  

• three dimensional
  

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• Thus the total number of all the --- basic crystal system is only 14.
  

• These are known as ---.
  

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• seven
  

• Bravias lattice
  

Front 4

Thus Bravias lattices are arrangement of points in three dimensional space in 14 different ways to explain the ----.

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crystal geometry of different types of substances

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• Draw schematics to show different types of Bravislattices in crystalline materials.
  

• Calculate the atomic packing factor(APF) of FCC and BCC crystal structure.
  

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???

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Bravis lattices are shown in Fig.

1. Cubic

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2. Tetrogonal

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3. Orthorhombic

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4. Monoclinic

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5. Sides equal

6. Unequal Slides

7. Unequal Slides-Unequal angles

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