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High Pressure Research Vol. 25, No. 2, June 2005, 107118
 

Summary: High Pressure Research
Vol. 25, No. 2, June 2005, 107­118
A new belt-type apparatus for neutron-based rheological
measurements at gigapascal pressures
DAVID P. DOBSON*, JULIAN MECKLENBURGH, DARIO ALFE§,
IAN G. WOOD and MARK R. DAYMOND¶
Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
School of Earth, Atmospheric and Environmental Sciences, The University of Manchester,
Oxford Road, Manchester, M13 9PL, UK
§Department of Physics and Astronomy, University College London, Gower Street, London,
WC1E 6BT, UK
¶ISIS, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, OX11 0QX, UK
Department of Mechanical and Materials Engineering, Queens University, Kingston, Ontario, Canada
(Received 15 March 2005; revised 14 April 2005; in final form 18 April 2005)
We have developed a new solid-media apparatus for performing rheological investigations at multi-
gigapascal pressures. The pressure cell consists of a simple belt design and fits in a modified 250 tonne
Paris­Edinburgh press. Elastic strains are measured by neutron diffraction, on the ENGIN-X experi-
mental station at ISIS. Stresses are estimated from the measured strains in combination with published
values of the elastic moduli. As an exemplair of the method, we present data from initial deformation
experiments on pyrope garnet at 1.5 GPa and 873 K. Data collection times are as short as 60 min and

  

Source: Alfè, Dario - Departments of Earth Sciences & Physics and Astronomy, University College London

 

Collections: Physics; Geosciences