27-788
Defects in Crystals
Fall 2017
Tues. & Thurs. 3:30 5:20, Porter Hall 125C
Gregory S. Rohrer
Wean Hall 3327, 268-2696, [email protected]
Note: if you are contacting me by email (which is preferred), use your cmu domain email
address. Mail from othe
27-201/211 Structure of Materials
Class 12
Scattering & the Structure Factor
1
Announcements
Homework 06 posted, due Friday, October 16
No usual office hours (Thursday/Friday)
Lab 03 posted two submissions
- Planning notebook due October 30
- Final Notebo
27-201/211 Structure of Materials
Class 18
Special and General Positions in Point Groups
1
Announcements
Homework #8 due Friday, November 20, 4:30 PM
No class Tuesday, November 17
2
Review
Point symmetry arrangements around a point
Sketch derivation and e
27-201/211 Structure of Materials
Class 1
Introduction, Administrivia, Crystal Systems, Bravais Lattices, Unit Cells
1
Objectives
Two parts to todays class:
- Administrative Part 1) Introduce myself and MSE
2) Learning MSE @ CMU
3) Course intro
1) Impleme
27-201/211 Structure of Materials
Class 19
Combinations of Symmetry Elements with Translations
Brief Introduction to Space Groups
1
Announcements
Homework #09 due Friday, 4:30 PM
Paper copy
OR
Electronic (e-mail to [email protected])
OR
Hybrid
Lab #04 due Th
27-201/211 Structure of Materials
Class 21
Metallic Structures: Classifications & Properties
1
Announcements
Lab 04 info posted on Blackboard, groups assigned
Final Exam info posted on Blackboard
No exam during the scheduled finals period. No additional h
27-201/211 Structure of Materials
Class 15
Combinations of Symmetry Operations The Point Groups
1
Announcements
Lab 03 notes
Due Monday November 16, 4:30 PM
Some updated notes on BB
Samples available
Note Cr and Fe form changes, only need to do one
Homewo
27-201/211 Structure of Materials
Class 16
Combinations of Symmetry Operations The Point Groups II
1
Announcements
Lab 03 Scheduling up
2
Review
Defined the fundamental symmetry operations
1.
Translations
2.
Rotations (only 1,2,3,4,6-folds possible)
3.
Re
27-201/211 Structure of Materials
Class 14
The Fundamental Symmetry Operations
1
Announcements
Midterm exam grades
Lab 03 planning
2
Outline / Objectives
Define symmetry, symmetry operation
Definition of a symmetry operation (as a coordinate transformatio
27-201/211 Structure of Materials
Class 17
Point Groups III
1
Announcements
Homework 7 due this afternoon
Lab 03 due Friday: If there are questions, let me know. One
question to address in your discussion could be how would you
verify the material is actu
27-201/211 Structure of Materials
Class 20
Examples with Space Groups
1
Announcements
We need to have Lab 04, arrangements finalized, look for e-mail
instructions today or tomorrow
Homework 09 = Final Exam, will consist of:
Problems from todays class, SG
27-201/211 Structure of Materials
Class 13
Specialized Diffraction Topics Real peaks, Peak broadening, thin films
1
Review
Spent this first half of the class defining and characterizing crystal
structures
Last time we defined the structure factor by first
27-201/211 Structure of Materials
Class 06
Diffracted Intensity Calculations
Additional Examples Structure factors with multi-atom motifs, non-cubic
patterns, real diffraction peaks
1
Review
Powder diffraction equal numbers of crystallites oriented for di
27-201/211 Structure of Materials
Class 2
Crystallographic Directions & Planes
1
Announcements
1. Academic Development
2. Lab 01 Friday, September 4th
Meet at the fountain in front of the Carnegie Museum of Natural History at
2:15 PM, the museum is at the
27-201/211 Structure of Materials
Class 10
The Reciprocal Lattice and Diffraction
1
Announcements
Homework 05 posted, due Friday
Dont panic!
2
Review
1
1
1
cos
The Reciprocal Space Basis, way of representing the
periodicity of cfw_hkl planes
27-201/211 Structure of Materials
Class 09
The Reciprocal Lattice
1
Announcements
Lab 02 due Friday, 4:30 PM
HW 4 due Friday at 4:30 PM
2
Review
Weve been working with lattices in terms of physical distances
Basis vectors have magnitude [length] and are t
27-201/211 Structure of Materials
Class 11
Lab Reports and Writing
1
Announcements
Homework 05 due Friday, 4:30 PM
Usual office hours this week, though I need to leave 4:45 PM
Thursday, so come a little early if necessary
2
The Monoclinc Metric Tensor
3
T
27-201/211 Structure of Materials
Class 07
Basis vectors, the metric tensor, distance & angle calculations
1
Announcements
Slight tweak to schedule of classes on Blackboard
Homework 03 due this Friday, September 25, at 4:30 PM
Office hours today 3-5 PM (W
27-201/211 Structure of Materials
Class 05
Powder Diffraction
Indexing XRD Patterns
The Structure Factor
1
Announcements
Lab 2 samples available
Homework 3 posted, due Sept. 25
No Friday session get your pictures taken!
Office hours today
Working in lab g
27-201/211 Structure of Materials
Class 03
Introduction to CrystalMaker
1
Review
Defined crystal structure = lattice + basis
Use symmetry to distinguish between the crystal systems
Explored application of centering to form lattices (nets in 2D)
Define
27-201/211 Structure of Materials
Class 08
Distance & angle calculations
1
Announcements
XRD intensity calcs, T factor use 280 K
Sign the x-ray logbook near the Rigaku
2
Review
SOM Chapter 4
3
Outline / Objectives
Calculate the metric tensor for any cryst
Thermodynamics of Materials
27215
Fall, 2014
Problem Set 7, Due Wednesday, October 29
1. Dene the following terms or provide short answers:
(a) Given a single component system, which phase is the stable phase at xed
temperature and pressure? ,
(b) Given a
27 -215 Thermodynamics of Materials
Fall, 2014
Problem Set #6
Due: Wednesday, October 22
l. Gaskell 5.1 and 5.2 done together.
2. Gaskell 5.3 and 5.4 done together.
3. Derive the expressions for dV, dS, dU, dH, dA and dG when the independent variables are
27-201/211 Structure of Materials
Class 22
Ceramic Structures: Classifications & Properties
1
Announcements
Office hours today
Office hours in lab tomorrow, I may be a late due to PhD qualifier
Lab 04 projects assigned
SAC Holiday Party
2
Review
Defined t
27-201/211 Structure of Materials
Class 23
The Free Electron Theory of Solids
1
Announcements
Final Exam Due Date: Thursday, December 17, 11:30 AM
Lab 04 Due Date: Sunday, December 20, 2015, 11:59 PM
Office Hours as usual Thursday and Friday afternoon
Not