ME222_Lecture_3_5_Chandraprakash.pdf

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Nature and Properties of Materials ME 222A Dr. Chandraprakash Mechanical Engineering IIT Kanpur Lecture 3-5: Basics of Crystallography
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Arrangement of atoms/molecules Material structure Complete Order eg. Solids Partial or short order ( m m) Eg. Solids, liquid crystals Very short (nm) or no order material flows Eg. Liquids, gases, plasma - Crystalline_polycrystalline_amorphous2.svg.png
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Polycrystal
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Polycrystalline and amorphous Polymers
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Polycrystalline and amorphous Polymers
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Characteristics of crystalline solids Long range order Defined geometry Symmetry Anisotropic Well-defined properties such as melting points (temperature dependent properties) and elastic moduli unlike polymers glass transition temperature
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Definitions Lattice : Array of points in space where every point has an identical environment Defines periodicity of crystal Basis or Motif : A single or group of atoms identical in composition and orientation in space Defines what is to be repeated Crystal : Array of atoms in space.
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