Annette Kleppe


Beamline Scientist for I15
Annette Kleppe is a Beamline Scientist on the Extreme Conditions beamline. Annette joined Diamond in October 2006 from the Department of Earth Sciences, University of Oxford.

Tel: +44 (0) 1235 778672

Key Research Area

Other Specialist Areas

  • High-pressure
  • diamond-anvil cell

Latest Publications

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  1. Research Expertise
  2. Publications
Research Expertise -

Current Research Interests

My research interests span the fields of high-pressure high-temperature Earth and Planetary Science. My aim is to contribute to our understanding of the structure, composition, formation, and evolution of the Earth’s and planetary interiors by investigating experimentally the physical and chemical properties of geological (silicates, oxides and iron alloyed with light elements) and planetary materials (gases, ices and their compounds).

Currently my work is focussing on molecular solids in particular on rare-gas -hydrogen compounds. The study of hydrogen-rich binary mixtures is particularly attractive because they are of interest to planetary science and astronomy, are potentially relevant technologically for hydrogen storage, and, last but not least, bear the tantalising prospect to observe the pressure-induced insulator-metal transition in hydrogen at a lower pressure than required for bulk H2. At the moment I am investigating Xe-H2 and Kr-H2 van der Waals compounds under high-pressures and -temperatures in the diamond-anvil cell with single-crystal as well as powder synchrotron X-ray diffraction and micro-Raman spectroscopy. Complex phase behaviour as a function of composition, pressure and temperature with the formation of different stoichiometric phases is observed. Interesting structural diversity occurs as a function of rare-gas.

Another interesting research activity I'm currently involved in is the characterisation of new minerals in collaboration with Mark Welch and Mike Rumsey, Natural History Museum, London.

My current role at Diamond entails:

  • Operation and development of the beamline and peripheral laboratories
  • User support
  • Research
Publications - +


Welch, M.D. and Kleppe, A.K. (2016) Polymorphism of the hydroxide perovskite Ga(OH)3 and possible proton-driven transformational behaviour, Physics and Chemistry of Minerals, 43 (7), 515-526
DOI: 10.1007/s00269-016-0812-y

Welch, M.D., Rumsey, M.S., and Kleppe, A.K. (2016) A naturally-occurring new lead-based halocuprate(I), Journal of Solid State Chemistry, 238, 9-14
DOI: 10.1016/j.jssc.2016.03.005

Casati, N., Kleppe, A.K., Jephcoat A.P., and Macchi. P. (2016) Putting pressure on aromaticity along with in-situ experimental electron density of a molecular crystal, Nature Communications
doi: 10.1038/ncomms10901

Kleppe, A.K., Amboage M., and Jephcoat A.P. (2014) New high-pressure van der Waals compound Kr(H2)4 discovered in the krypton-hydrogen binary system, Scientific Reports
doi: 10.1038/srep04989