lect14_reel4

lect14_reel4 - Incoming X-ray photon ejected e − 1...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Solid State Synthesis, Phase Solid State Synthesis, Phase Diagrams and Solid Solutions Diagrams and Solid Solutions Chemistry 123 Spring 2008 Dr. Woodward
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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  4
Background image of page 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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 4
X-ray Fluorescence X-ray Fluorescence
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Incoming X-ray photon ejected e − 1 Emitted photon 2 3 Principle Quantum # Subshells Electron Shell Label # of Electrons in Shell 1 1s K 2 2 2s, 2p L 8 3 3s, 3p, 3d M 18 4 4s, 4p, 4d, 4f N 32 Because the energy levels between different shells change from element to element (because the effective nuclear charge is changing) the energy of the secondary X-rays that are emitted are different for each element. By measuring the energies of the secondary X-rays we can determine which elements are present and their approximate ratios . keV (Energy) 8.04 8.63 keV 9.58 Zn K α Zn K β Cu K α U.S. Penny (2008) Zinc nitrate Zn K α 8.63 keV keV (Energy) Zn K β 5 6 7 8 9 10 11 12 Kα Kβ Lα Lβ Energy K shell n = 1 L shell n = 2 M shell n = 3 N shell n = 4...
View Full Document

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.

Page1 / 6

lect14_reel4 - Incoming X-ray photon ejected e − 1...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online