dr jeremy cockcroft
- Dr Jeremy Cockcroft
- Ex: 25802
- Senior Lecturer
- Dept of Chemistry
- Faculty of Maths & Physical Sciences
Despite the fact that many of my current teaching duties are now in the classical area of Inorganic Chemistry, my research interests are very wide and diverse, though invariably they revolve around either X-ray (or sometimes neutron) diffraction studies of powder samples under a variety of conditions.
I have studied polymorphism of organic molecules (particularly those of pharmaceutical interest), orientational order-disorder phase transitions in inorganic salts, magnetic phase transitions, structure solution by powder methods, solid-state kinetics, and I have even dabbled in protein crystallography. I am particularly interested in applying crystallography and diffraction methods to chemical problems. In particular, I find curiosity-driven experiments, and especially the serendipitous aspects of scientific research, highly stimulating and far more rewarding intellectually, than planned research based on delivery targets and short-term financial outcomes. Gant charts and their ilk are fine for managing complex projects, but do they encourage blue skies thinking? A few of my current interests are described in more detail below.
- In-Situ Crystallography
- Non-Ambient Crystallography
- Pharmaceutical Polymorphism
A detailed study of the variation in lattice parameter with temperature and dilution in holmium-doped hexachloro-elpasolite Cs2NaYCl6.
Thermal properties of Si136: Theoretical and experimental study of the type-II clathrate polymorph of Si
Characterization of the flow of anisotropic colloidal particles using energy-dispersive X-ray diffraction
An in situ study of crystallisation gradients during the hydrothermal/autoclave synthesis of zeolites
The site occupancy of Mg in the brownmillerite structure and its effect on hydration properties: an X-ray/neutron diffraction and EXAFS study
1985DPhilDoctor of PhilosophyTo be updated
The uncropped photo shows me standing next to the Stoe X-ray powder diffractometer with the small PSD mounted and looking at the newly-installed Oxford Instruments Cryojet. The latter is now used routinely for measuring samples cooled down to about 100 K and heated up to about 500 K. For very low temperature work down to about 5 K, we have aliquid-helium "orange" cryostat, similar in design to those used at ILL, Grenoble, and ISIS, RAL, but with clear mylar windows for use with a laboratory X-ray source, which has been installed and tested with much help from Martin Vickers and Mark Ellerby (in the Department of Physics at UCL). Our Stoe STADI-P instrument is used heavily as it gives more reliable intensity data, e.g. data suitable for structure refinement by the Rietveld method, than our older D500 Bragg-Brentano diffractometer. To complement the low-temperature facilities, a high-temperature furnaces has been developed in collaboration with G. Sankar.
In contrast to many academics, I am very much a "hands-on" academic who likes to participate actively in experiments and help out students and post-docs alike, both in our PXRD laboratory and at large-scale central facilities, e.g. the X-ray synchrotron and neutron sources. So look for me in the PXRD labs before trying out my office (and certainly avoid phoning me in the latter without prior warning as I'm unlikely to answer your call)!