Engineering Materials
Sulphur in steel

Lowers the toughness and transverse ductility
Reduces the grain size
Decreases tensile strength and hardness
Acts as deoxidiser

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Engineering Materials
The unit cells

All of these
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
Have the same orientation and their similar faces are parallel

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