Principal of geometry and Some Applications of Crystal

Principal of geometry and Some Applications of Crystal Structure in Materials Karimat El-Sayed Physics Departement, Faculty of Science, Ain Shams University

Whatis … Materials. Science : investigationoftherelationshipsthatexistbetween the structure and properties ofmaterials. Materials. Engineering : designingmaterialsthathavespecificproperties onthe basis ofstructure/propertyrelationships. Primarilyconcernedwithstudyof : Metals/Alloys Ceramics/Glasses Polymers* Biological. Materials Composites “ Condensed Phases ” Mechanical Electrical Thermal Magnetic Optical“ Structure ” “ Properties ”Main. Idea :

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What. Do. We. Meanby‘Structure’? Many levels ofstructure : Macroscale Microscale Nanoscale Atomic(Å) Mostphysicalpropertiesofamaterialaredirectlyrelated tothe typesandarrangementsofbondsinthematerial. Descriptionsofmaterialstructurebeginatthe atomiclevel. Broadrangeoflengthscales…

ELECTRO MAGNETIC SPECTRUM

Optical Microscope and x-Ray Diffraction Image

UNIT CELL

PLANES AND DIRECTIONS

Title the 111 plane

Mirror

THREE FOLD AXIS

TETRAGONAL

TETRAGONAL

DIFFERENT FORM OF HEXAGONAL

STRUCTURE SHOWING THE SIX FOLD SYMMETRY

The Arrangement of Atoms in Three Dimensions

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INTERSTITIAL SPACES