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Defects in Crystals

© H. Föll

Winter Term 2012

Hyperscripts of AMAT:
General Information

Index
All Information concerning the Seminar will - in time - be found here
Contacts:
Iris Hölken: ih@tf.uni-kiel.de
Sandra Nöhren: sn@tf.uni-kiel.de
     
The Seminar / Mini Conference
Group Date
First Part    Friday, Jan 25th 2013, "Aquarium"
1 Thermodynamics of Point Defects in Ionic Crystals described by Mass Action Law Muhammad Omer Farooq
Muhammad Taha Sultan
25. 01.13
1.00 p.m.
Explain the extension of the mass actio law to defects. Discuss shortly the problems with notation (Schottky, Kröger-Vink)    
Give a simple example for the application to ionic crystals    
  All necessary information can be found in the hyperscript.    
2 Ionic Sensors Patrick Hayes
Egle Vasiliauskaite
25.01.13
1.30 p.m.
Describe the basic principle using the oxygen sensor as example    
Give a more complex example involving Brouwer diagrams    
  Information can be found in the hyperscript + plenty of easy to find literature    
3   Positron Annihilation Techniques Alexander Denissenko
Avula Venkata Sridhar Reddy
25.01.13
2.00 p.m.
How it is done?    
Derivation of basic equations·     
Extension of the techniques (angle correlation, application to non-crystals, …)    
  Prof. Rätzke is an expert and might be approached
Link 1
   
4   Point defects in iron and steel Stefanie Schlüter
Grit Köppel
25.01.13
2.30 p.m.
Present and discuss the available data for vacancies and self interstitial in bcc and fcc iron (ferrite and austenite).    
Discuss the influence of phase changes including magnetization on diffusion.    
Discuss diffusion limited processes during phase change.    
(Present and discuss the available data for carbon interstitials in bcc and fcc iron (ferrite and austenite). Consequences for the processing of steel.)    
  Information will be provided    
5   Dislocations and Plastic Deformation in Hexagonal Crystals Jan Jakobeit
Chima Obobi Kalu
25.01.13
3.00 p.m.
Describe the specialities of plastic deformation in hex. crystals as a function of the crystal and defect symmetry    
Give examples, discuss the technical importance.    
       
Second Part       Friday, Feb. 1st 2013, "Aquarium"
6   Dislocations and Plastic Deformation in bcc Crystals
Chen Rui
Qaisar Latif
Mozammal Manzoor
01.02.13
1.00 p.m.
Describe the specialities of plastic deformation in bcc crystals. Consider glide systems, the role of screw dislocations    
Consider low temperature deformation; twinning as a deformation mode    
Applications, state of the art, outlook    
       
7   Defects in Quasicrystals (Nobel Prize 2011)
Jannis Lemke
Tahsin Raman
01.02.13
1.30 p.m.
History, general background for periodic tilings in 2 Dimensions    
Quasicrystal as projections from 6-dim. crystals    
Point defects and diffusion, Phasons and quasi-dislocations, State of the art and problems    
       
8   Intrinsic gettering in silicon Alexander Hinz
Alexander Omelcenko
01.02.13
2.00 p.m.
The problem and the solution    
How it is done· Examples    
Limits, use in, e.g., solar cells.    
       
9 Critical thickness for epitaxial layers· Sebastian Mangelsen
Michael Poschmann
01.02.13
2.30 p.m.
Derive and discuss basic equations·    
Discuss ways to overcome problem, give examples    
       
10 GaN epitaxy Till Jurgeleit
Arne Kudropp
01.02.13
3.00 p.m.
Describe necessity, problems and existing solutions    
Discuss modern development (GaN on Si)    
  Link 1