Crystalline Solids_Crystollographic points directions and planes

# Crystalline Solids_Crystollographic points directions and planes

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Materials Science and Engineering MIME 1650 Lecture 4 1 1 Chapter 3 - MIME 1650 Materials Science and Engineering Lecture 4: Crystalline Structure and Miller Indices 2 Chapter 3 - LAB #1 THIS WEEK Print out lab #1 handout before your lab session 0 ANNOUNCEMENTS

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Materials Science and Engineering MIME 1650 Lecture 4 2 3 Chapter 3 - 3.7 Crystal Systems There are seven different possible combinations of the lattice parameters Each combination is a distinct crystal system The seven crystal systems are Cubic Rhombohedral Monoclinic Triclinic Tetragonal Hexagonal Orthogonal Unit cell geometry can be completely defined by six parameters known as lattice parameters Three edge lengths a, b, c Three interaxial angles α, β, γ 4 Chapter 3 - 7 crystal systems α β γ a ≠ b ≠ c Triclinic α = γ = 90 o β a ≠ b ≠ c Monoclinic α = β = γ = 90 o a ≠ b ≠ c Orthorhombic α = β = γ ≠ 90 o a = b = c Rhombohedral α = β = γ = 90 o a = b ≠ c Tetragonal α = β = 90 o , γ = 120 o a = b ≠ c Hexagonal α = β = γ = 90 o a = b = c Cubic Unit cell Interaxial angles Axial relationships Crystal system
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Crystalline Solids_Crystollographic points directions and planes

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