ENTC 206 Notes 5 Crystalline Structure

ENTC 206 Notes 5 Crystalline Structure - ENTC 206...

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ENTC 206 Crystalline Structure Chapter 3
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Solid – Molecular, Amorphous Solid - Crystalline Four physical states of matter: Solid , Liquid , Gas , and Plasma Gas Liquid Plasma Lamp The sun blasts plasma throughout the solar system
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Structure Components of Solid Materials Atoms – Smallest particle of an element Molecules ( ) – Smallest unit of matter (elements or compounds) that can exist by itself and retain all its chemical properties Gas : N 2 , C 2 H 4 ; Liquid : H 2 SO 4 ; Solid : proteins, polymers Crystals ( ionic bonds, metallic bonds ) – Homogeneous portion of matter that has a definite, orderly atomic structure; e.g., ceramics and metals Phases –A homogeneous part of a heterogeneous material that is separated from other parts by a distinguishable boundary – A phase has same atomic arrangement, composition, and properties throughout Protein molecule P1 P2 P3
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Crystalline Solids TEM Image of gallium nitride (GaN) STM image of individual platinum (Pt) and nickel atoms (from IBM) • The atoms of the material are arranged in a regular and repeating manner. Nickel (110) Platinum (111)
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Non dense, random packing • Dense, ordered packing Dense, ordered packed structures tend to have lower potential energies. Energy and Packing
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This note was uploaded on 04/06/2008 for the course ENTC 206 taught by Professor Fang during the Spring '08 term at Texas A&M.

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ENTC 206 Notes 5 Crystalline Structure - ENTC 206...

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