Melting of Copper and Nickel at high pressure: the role of d-electrons Page: 3 of 16
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Melting of copper and nickel at high pressure; the role of d-electrons
Stefanie Japel1, Reinhard Boehleri and Marvin Ross'
Max Planck Institut fur Chemie, Postfach 3060, D-55020 Mainz, Germany
Lawrence Livermore National Laboratory, University of California, Livermore,
PACS numbers: 61.25.Mv, 64.70.Dv
Melting curves of Cu and Ni were measured to 97 GPa (3800 K) and 60
GPa (2970 K), respectively, in the laser-heated diamond cell. The
measured melting temperatures of Cu are in good agreement with
recent theoretical calculations. The melting slope (dT/dP) of Cu, which
has a filled d-electron band, is about 2.5 times steeper than for Ni,
which with one less electron, has a partially unfilled d-electron band.
The relatively low melting slope obtained for Ni, measured using
identical experimental methods as for Cu, is consistent with our
previous measurements for other transition metals with partially filled
d-bands, which are in serious disagreement with theoretical estimates.
The present results confirm the key role d-shell electrons play in
determining the high pressure melting curves.
Measurements of melting curves for transition metals made in the megabar
pressure range, to temperatures of 3000 K to 4000 K, using a laser heated diamond-
anvil cell (DAC) have lead to the discovery of unusually low melting slopes
(dT/dP-0)[1-3]. These relatively flat curves have become controversial because they
are in considerable disagreement with theoretical calculations which predict that
melting temperatures of transition metals should rise with increasing pressure much
more sharply than those determined experimentally. The differences between the
measured and predicted melting temperatures are much larger than the maximum
experimental uncertainties associated with temperature measurement and the
detection of melting in the laser-heated diamond cell.
In order to understand the physical basis for the low melting slopes, a
theoretical model was developed in which the d-electron density of states
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Japel, S; Boehler, R & Ross, M. Melting of Copper and Nickel at high pressure: the role of d-electrons, article, April 11, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc900450/m1/3/: accessed February 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.