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The high-pressure, high-temperature phase diagram of cerium
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- Munro, Keith (författare)
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom
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- Daisenberger, Dominik (författare)
- Diamond Light Source Ltd., Harwell Science and Innovation Campus, Fermi Ave, Didcot, OX11 0DE, United Kingdom
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- MacLeod, Simon (författare)
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom; Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, United Kingdom; Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11 0FA, United Kingdom
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- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom Diamond Light Source Ltd, Harwell Science and Innovation Campus, Fermi Ave, Didcot, OX11 0DE, United Kingdom (creator_code:org_t)
- Institute of Physics (IOP), 2020
- 2020
- Engelska.
- Ingår i: Journal of Physics. - : Institute of Physics (IOP). - 0953-8984 .- 1361-648X. ; 32:33
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- We present an experimental study of the high-pressure, high-temperature behaviour of cerium up to ~22 GPa and 820 K using angle-dispersive x-ray diffraction and external resistive heating. Studies above 820 K were prevented by chemical reactions between the samples and the diamond anvils of the pressure cells. We unambiguously measure the stability region of the orthorhombic oC4 phase and find it reaches its apex at 7.1 GPa and 650 K. We locate the α-cF4–oC4–tI2 triple point at 6.1 GPa and 640 K, 1 GPa below the location of the apex of the oC4 phase, and 1–2 GPa lower than previously reported. We find the α-cF4 → tI2 phase boundary to have a positive gradient of 280 K (GPa)−1, less steep than the 670 K (GPa)−1 reported previously, and find the oC4 → tI2 phase boundary to lie at higher temperatures than previously found. We also find variations as large as 2–3 GPa in the transition pressures at which the oC4 → tI2 transition takes place at a given temperature, the reasons for which remain unclear. Finally, we find no evidence that the α-cF4 → tI2 is not second order at all temperatures up to 820 K.
Ämnesord
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- high pressure
- phase diagram
- cerium
- Experimentell fysik
- Experimental Physics
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