H
Holger Hellwig
Researcher at University of Illinois at Urbana–Champaign
Publications - 7
Citations - 335
Holger Hellwig is an academic researcher from University of Illinois at Urbana–Champaign. The author has contributed to research in topics: Stishovite & Raman spectroscopy. The author has an hindex of 7, co-authored 7 publications receiving 307 citations. Previous affiliations of Holger Hellwig include Carnegie Institution for Science.
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Journal ArticleDOI
The post-stishovite phase transition in hydrous alumina-bearing SiO2 in the lower mantle of the earth
D. L. Lakshtanov,Stanislav V. Sinogeikin,Stanislav V. Sinogeikin,Konstantin D. Litasov,Vitali B. Prakapenka,Holger Hellwig,Jingyun Wang,Carmen Sanches-Valle,Jean-Philippe Perrillat,Bin Chen,Maddury Somayazulu,Jie Li,Eiji Ohtani,Jay D. Bass +13 more
TL;DR: The results suggest that the rutile–CaCl2 transition in natural stishovite (with 5 wt % Al2O3) should occur at ≈30 GPa or ≈1-000-km depth at mantle temperatures, and the major changes in elastic properties across this transition could make it visible in seismic profiles and may be responsible for seismic reflectors observed at 1,000- to 1,400- km depth.
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Sound velocity of MgSiO3 perovskite to Mbar pressure
Motohiko Murakami,Motohiko Murakami,Stanislav V. Sinogeikin,Holger Hellwig,Jay D. Bass,Jie Li +5 more
TL;DR: In this article, the authors showed that the elastic wave velocities for a nearadiabatic lower mantle with a bulk composition dominated by magnesium silicate perovskite are consistent with the average lower mantle seismic velocity structure.
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Thermoelastic properties of (Mg0.64Fe0.36)O ferropericlase based on in situ X-ray diffraction to 26.7 GPa and 2173 K
Wim van Westrenen,Jie Li,Jie Li,Yingwei Fei,Mark R. Frank,Mark R. Frank,Holger Hellwig,Holger Hellwig,Tetsu Komabayashi,Kenji Mibe,Kenji Mibe,William G. Minarik,William G. Minarik,James A. Van Orman,James A. Van Orman,Heather C. Watson,Heather C. Watson,Ken-ichi Funakoshi,Max W. Schmidt +18 more
TL;DR: In this article, the volume of polycrystalline (Mg 0.64 Fe 0.36 )O ferropericlase (FP) was determined through in situ energy-dispersive synchrotron X-ray diffraction in a multianvil press, using gold and MgO as pressure markers.
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Polymorphic phase transition in Superhydrous Phase B
TL;DR: In this article, the authors synthesized superhydrous phase B (shy-B) at 22 GPa and two different temperatures: 1200°C (LT) and 1400°C(HT) using a multi-anvil apparatus.
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Effect of Al3+ and H+ on the elastic properties of stishovite
D. L. Lakshtanov,Konstantin D. Litasov,Stanislav V. Sinogeikin,Stanislav V. Sinogeikin,Holger Hellwig,Jie Li,Eiji Ohtani,Jay D. Bass +7 more
TL;DR: In this paper, X-ray diffraction and compositional data suggest that the incorporation mechanism of Al 3+ into stishovite involves the formation of oxygen vacancies, in addition to the incorporation H + in the structure.