Annette Kleppe


Senior Beamline Scientist 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

Techniques and Disciplines

Other Specialist Areas

  • High-pressure
  • diamond-anvil cell

Latest Publications

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  1. Research Expertise
  2. Publications 2016-2020
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 2016-2020 - +

Selected publications

Rumsey, M.S., Welch, M.D., Spratt, J., Kleppe, A.K. (2020) Grguricite, CaCr2(CO3)2(OH)4.4H2O, a new alumohydrocalcite analogue, Mineralogical Magazine, doi 10.1180/mgm.2020.66

Najorka, J., Kleppe, A.K., Welch M.D. (2019) The effect of pressure and composition on Cu-bearing hydroxide perovskite (2019) Physics and Chemistry of Minerals doi 10.1007/s00269-019-01047-9

Anzellini, S., et al. (2018) Laser-heating system for high-pressure X-ray diffraction at the Extreme Conditions beamline I15 at Diamond Light Source, Journal of Synchrotron Radiation, doi 10.1107/S1600577518013383.

Rumsey, M.S., Welch, M.D., Mo, F., Kleppe, A.K., Spratt, J., Kampf, A.R., Raanes, M.P. (2017) Millsite CuTeO3·2H2O: a new polymorph of teineite from Gråurdfjellet, Oppdal, Norway, Mineralogical Magazine, doi 10.1180/minmag.2017.081.057

Rumsey, M.S., Welch, M.D., Kleppe, A.K., and Spratt, J. (2017) Siidraite, Pb2Cu(OH)2I3, from Broken Hill, New South Wales, Australia: the third halocuprate(I) mineral, European Journal of Mineralogy, doi 10.1127/ejm/2017/0029-2676

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, 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, doi 10.1016/j.jssc.2016.03.005

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