MATERIAL SCIENCE 0.0 / 5 ? OtherEngineeringOtherNone Created by: Subha00Created on: 28-06-22 08:41 CUBIC UNIT CELL Interaxial length: a = b = c Interaxial angle: alpha = beta = gamma = 90 degrees 1 of 13 TETRAGONAL a = b not equal to c alpha = beta = gamma = 90 degrees 2 of 13 ORTHORHOMBIC a not equal to b not equal to c alpha = beta = gamma = 90 degrees 3 of 13 MONOCLINIC a not equal to b not equal to c alpha = gamma = 90 degrees not equal to beta 4 of 13 TRICLINIC a not equal to b not equal to c alpha not equal to beta not equal to gamma 5 of 13 HEXAGONAL a = b not equal to c alpha = beta = 90, gamma =120 6 of 13 Rhombohedral (TRIGONAL) a = b = c alpha = beta = gamma not equal to 90 7 of 13 BRAVAIS LATTICES 14 different 3D configurations into which atoms can be arrange in different crystals. 8 of 13 BRAVAIS LATTICES OF CUBIC STRUCTURE SIMPLE CUBIC BODY CENTERED CUBIC FACE CENTERED CUBIC 9 of 13 WHAT IS ATOMIC PACKING FACTOR (APF) Ratio of volume of effective number of atoms to the volume of unit cell. 10 of 13 Example of Simple cubic unit cell alpha - polonium 11 of 13 Why is simple cubic unit cell highly unstable? As approximately 50% of it is empty. 12 of 13 Examples of BCC (Body centered cubic) Molybdenum, Tantalum, Vanadium, Tungsten, Chromium, alpha - iron 13 of 13
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