![]() ![]() FCC Structure HCP Structure BCC Structure Figure 3.3 3-7Ĩ Body Centered Cubic (BCC) Crystal Structure ![]() HCP is denser version of simple hexagonal crystal structure. I: “Structure,” Wiley, 1964, p.47.)ĩ0% of the metals have either Body Centered Cubic (BCC), Face Centered Cubic (FCC) or Hexagonal Close Packed (HCP) crystal structure. Wulff, “The Structure and Properties of Materials,” vol. Hexagonal a = b ≠ c α = β = 900 γ = 1200 Monoclinic a ≠ b ≠ c α = γ = 900 ≠ β Triclinic α ≠ β ≠ γ ≠ 900 Simple Base Centered Simple Figure 3.2 Simple 3-6 After W.G. Orthorhombic a ≠ b ≠ c α = β = γ = 900 Rhombohedral a =b = c α = β = γ ≠ 900 Simple Base Centered Body Centered Face Centered Figure 3.2 Simple 3-5 After W.G. The four basic types of unit cells are Simple Body Centered Face Centered Base Centered 3-3Ĥ Types of Unit Cells Cubic Unit Cell Tetragonal α = β = γ = 900Ī = b = c α = β = γ = 900 Tetragonal a =b ≠ c Body Centered Simple Figure 3.2 Face centered Simple Body Centered 3-4 After W.G. According to Bravais ( ) fourteen standard unit cells can describe all possible lattice networks. Only seven different types of unit cells are necessary to create all point lattices. Lattice constants Materials arranged in short range order are called amorphous materials Unit Cell 3-2 Space Lattice Unit cell is that block of atoms which repeats itself to form space lattice. An imaginary network of lines, with atoms at intersection of lines, representing the arrangement of atoms is called space lattice. Properties of solids depends upon crystal structure and bonding force. 1 Crystal and Amorphous Structure in MaterialsĬHAPTER 3 Crystal and Amorphous Structure in Materials 3-1Ītoms, arranged in repetitive 3-Dimensional pattern, in long range order (LRO) give rise to crystal structure. ![]()
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