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| Types of Voids |
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| A simple triangular void in a crystal is surrounded by four spheres. |
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| fig 2.11 - A unit cell of simple cubic packing |
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| fig 2.11 - (a) Tetrahedral void |
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| Octahedral void |
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| A double triangular void surrounded by six spheres. |
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| fig 2.11 - (b) Octahedral void |
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| Radius Ratio |
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| If R = Radius of the sphere in the closed packed arrangement. |
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| r = Radius of the void. |
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