Molten barium titanate: a high-pressure liquid silicate analogue

Alderman, O. L. G.; Benmore, C. J.; Neuefeind, J.; Tamalonis, A.; Weber, R.

doi:10.1088/1361-648X/ab0939

Molten barium titanate: a high-pressure liquid silicate analogue

Journal Article · Fri Mar 15 00:00:00 EDT 2019 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/ab0939· OSTI ID:1558227

^[1]; Benmore, C. J. ^[2]; Neuefeind, J. ^[3]; Tamalonis, A. ^[1]; Weber, R. ^[4]

Materials Development, Inc., Arlington Heights, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Materials Development, Inc., Arlington Heights, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)

The structure of molten BaTiO₃ has been calculated using laser heating, aerodynamic levitation and a combination of neutron diffraction with Ti isotope substitution, x-ray diffraction and spectroscopy. All measurements indicate a Ti-O coordination of n_TiO = 4.4(2), far lower than the perovskite or hexagonal crystalline forms. Yet, n_TiO > 4 suggests structural analogy with molten silicates at high pressures. We introduce methodology for ascertaining such analogies and demonstrate similarity with molten CaSiO₃ at upper mantle pressures circa 5 GPa. While some topological differences exist, we postulate that planetary melt analogues provide rich insight into important processes relevant to hot exoplanets and Earth's early history.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357; SC0015241; SC0018601

OSTI ID:: 1558227

Alternate ID(s):: OSTI ID: 23008986

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 20 Vol. 31; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Molten barium titanate: a high-pressure liquid silicate analogue

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