lect14_reel4_2pg

Lect14_reel4_2pg - Solid State Synthesis Phase Diagrams and Solid Solutions Chemistry 123 Spring 2008 Dr Woodward Solid State Reactions Example

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1 Solid State Synthesis, Phase Solid State Synthesis, Phase Diagrams and Solid Solutions Diagrams and Solid Solutions Chemistry 123 Spring 2008 Dr. Woodward Solid State Reactions Solid State Reactions Micron Sized Powders (Starting Materials) Example: MgO(s) + MoO 3 (s) MgMoO 4 1 Grind 2 Heat 3 Repeat Grind & Heat 4
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2 Two Component Phase Diagram Two Component Phase Diagram Mole % ZnS 0 25 50 75 100 Liquid 2-phase region MgS(ss ) + ZnS(ss ) MgS (ss) + Liquid ZnS (ss) + Liquid MgS (ss) ZnS (ss) Temperature ( ° C) Pure ZnS Pure MgS A B C Eutectic Point D Mole % (ss) + (ss) (ss) + (ss) + (ss) Pure Pure Rock salt type Mg 1-x Zn x S Zinc Blende type Zn 1-x Mg x S Microscopic View Region A Region B Region C Microscopic View Microscopic View Homogeneous Solid Solution Mg 0.8 Zn 0.2 S Homogeneous Solid Solution Mg 0.1 Zn 0.9 S Two phase (heterogeneous) mixture Mg 0.8 Zn 0.2 S + Mg 0.1 Zn 0.9 S How can we analyze materials to determine their composition and heterogeneity.
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3 X-ray Fluorescence ray Fluorescence Incoming X-ray
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This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Spring '08 term at Ohio State.

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Lect14_reel4_2pg - Solid State Synthesis Phase Diagrams and Solid Solutions Chemistry 123 Spring 2008 Dr Woodward Solid State Reactions Example

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