Diffuse X-ray Scattering and Models of Disorder

Richard Welberry, Professor Emeritus, Australian National University, Canberra, Australia

Following his PhD degree (1968-1970) in Kathleen Lonsdale's Chemical Crystallography Laboratory at University College, London and a Postdoctoral Fellowship at University College Cardiff, T. R. Welberry was appointed to the Research School of Chemistry at ANU in 1975 and subsequently became full
Professor and is now an Emeritus Professor. He was Co-editor of two IUCr Journals over a period of 15 years and is now Editor of International Tables for Crystallography Vol. C .

I EXPERIMENT
1. Measurement of diffuse scattering
II DISORDER MODELS
2. Disorder in one dimension
3. Particular disorder models
4. Displacements in one dimension
5. Disorder in higher dimensions
6. Displacements in two or three dimensions
7. Interactions between occupancies and displacements
III EXAMPLES OF REAL DISORDERED SYSTEMS I
8. 1,3-dibromo-2,5-diethyl-4,6-dimethylbenzene (Bemb2)
9. p-chloro-N-(p-methyl-benzylidene)aniline (MeCl)
10. Urea inclusion compounds
11. Mullite
12. Wüstite
13. Cubic stabilised zirconias
14. Automatic refinement of 1 a Monte Carlo model
15. Further applications of the automatic Monte Carlo 16 method
16. Disorder involving multi-site interactions
17. Strain effects in disordered 1 crystals
18. Miscellaneous examples
IV EXAMPLES OF REAL DISORDERED SYSTEMS II
19. Pentachloronitrobenzene, C₆C_l5NO₂
20. Polymorphs of Benzocaine, C₉H₁₁O₂N
21. A new refinement strategy
22. Polymorphism in Aspirin
23. Lead perovskite relaxors, PZN and PMN
24. Pair Distribution Functions (PDF, 3D-PDF and 3D-?PDF)