Universität zu Köln

McCammon, Catherine ORCID: 0000-0001-5680-9106, Caracas, Razvan, Glazyrin, Konstantin, Potapkin, Vasily, Kantor, Anastasia, Sinmyo, Ryosuke ORCID: 0000-0001-5799-3400, Prescher, Clemens, Kupenko, Ilya ORCID: 0000-0003-3783-8360, Chumakov, Aleksandr and Dubrovinsky, Leonid ORCID: 0000-0002-3717-7585 (2016). Sound velocities of bridgmanite from density of states determined by nuclear inelastic scattering and first-principles calculations. Prog. Earth Planet. Sci., 3. NEW YORK: SPRINGER. ISSN 2197-4284

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Abstract

Sound velocities of bridgmanite measured in the laboratory are a key to deciphering the composition of the lower mantle. Here, we report Debye sound velocities determined using nuclear inelastic scattering (NIS) for one majorite composition (Mg0.82Fe0.18SiO3) and five bridgmanite compositions (Mg0.82Fe0.18SiO3, Mg0.86Fe0.14Si0.98Al0.02O3, Mg0.88Fe0.12SiO3, Mg0.6Fe0.4Si0.63Al0.37O3, Mg0.83Fe0.15Si0.98Al0.04O3) measured in a diamond anvil cell at pressures up to 89 GPa at room temperature. Debye sound velocities for majorite determined from NIS are consistent with literature data from Brillouin scattering and ultrasonics, while Debye sound velocities for bridgmanite are significantly lower than literature values from the same methods. We calculated partial and total density of states (DOS) for MgSiO3 and FeSiO3 bridgmanite using density functional theory and demonstrate that Debye sound velocities calculated from the reduced DOS using the same approach as for the experimental data (i.e., the limit of D(E)/E-2 as energy goes to zero) give the same sound velocities for each phase irrespective of which partial DOS is used. In addition, we show that Debye sound velocities calculated using this approach are consistent with values obtained from the calculation of the full elastic tensor. Comparison of the calculated DOS with the one obtained from NIS indicates that the experimental DOS has enhanced intensity at low energies that leads to a different slope of the DOS and hence a lower sound velocity. This effect is present in all of the bridgmanite samples examined in this study.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code McCammon, Catherine UNSPECIFIED orcid.org/0000-0001-5680-9106 UNSPECIFIED Caracas, Razvan UNSPECIFIED UNSPECIFIED UNSPECIFIED Glazyrin, Konstantin UNSPECIFIED UNSPECIFIED UNSPECIFIED Potapkin, Vasily UNSPECIFIED UNSPECIFIED UNSPECIFIED Kantor, Anastasia UNSPECIFIED UNSPECIFIED UNSPECIFIED Sinmyo, Ryosuke UNSPECIFIED orcid.org/0000-0001-5799-3400 UNSPECIFIED Prescher, Clemens UNSPECIFIED UNSPECIFIED UNSPECIFIED Kupenko, Ilya UNSPECIFIED orcid.org/0000-0003-3783-8360 UNSPECIFIED Chumakov, Aleksandr UNSPECIFIED UNSPECIFIED UNSPECIFIED Dubrovinsky, Leonid UNSPECIFIED orcid.org/0000-0002-3717-7585 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-278250
DOI:	10.1186/s40645-016-0089-2
Journal or Publication Title:	Prog. Earth Planet. Sci.
Volume:	3
Date:	2016
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	2197-4284
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELASTIC-WAVE VELOCITY; IRON OXIDATION-STATE; SOLID-SOLUTION; SILICATE PEROVSKITE; LOWER-MANTLE; TRANSITION; MAJORITE; PRESSURE; SPECTROSCOPY; (MG,FE)O Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27825