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Collaborative Research for Earth and Applied Materials (CREAM)
News and updates:
29. 01/15/2019, Zhongxun Cui joined CREAM.
Zhongxun will work as a graduate student at HPSTAR in the summer of 2019. He arrived earlier to work on his undergraduate thesis project. He can be found in room A319.
28. 01/11/2019, Article "Altered chemistry of oxygen and iron under deep Earth conditions" was published by Nature Communications.
The work continues our investigation on the iron superoxide. We clarify the magnetic and electronic structure in the pyrite-FeO2Hx. Liu, J., Hu, Q.*, Bi, W., Yang, L., Xiao, Y., Chow, P., Meng, Y., Prakapenka, V. B., Mao, H.-K.* and Mao, W. L.* Nat. Commun. 10, 153 (2019).
27. 12/09/2018, Article "Structural Controlled Oxygen Conentration Change in Fe2O3 and FeO2" was published by Inorganic Chemistry.
The work discoveries two competing transition pathways originated from perovskite-type Fe2O3. Using first-principles simulation and x-ray diffraction experiments, the transition to FeO2 was found to prevail at high-pressure and temperature conditions. Congratulations Shengcai and Jin! Zhu, S., Liu, J., Hu, Q.*, Mao, W. L., Meng, Y., Zhang, D., Mao, H. K. and Zhu, Q.* Inorg. Chem. (2018).
26. 10/26/2018, Dr. Hu was at the National Youth Geoscience Conference in Nanjing.
The geoscience meeting was organized by Nanjing University. Qingyang contributed a talk named "Iron oxides under deep lower mntle conditions".
25. 10/22/2018, Dr. Hu was at the Annual Meeting of Chinese Geoscience Union in Beijing.
The annual meeting organized by Chinese Geoscience Union provided the perfect plaform for geoscientists from all fields. Qingyang joined sessions about high-pressure mineral physics and spoke about groups' recent progress on hydrogen-bearing FeO2.
24. 09/24/2018, Dr. Hu was at the IUCr workshop of high pressure crystallography in Tianjin.
The meeting was held by Chinese union of crystallography and the session on sciences at the extreme conditions was led by Dr. Changqing Jin of CAS. Qingyang was in the session and shared progress in the mechansim of synthsizing high-pressure superoxide.
23. 09/01/2018, Co-authored paper "Metal‐to‐Semiconductor Transition and Electronic Dimensionality Reduction of Ca2N Electride under Pressure" was published by Advanced Science.
The project was led by Dr. Huiyang Gou of HPSTAR. The work studied the interesting pressure-induced effcts on the electride of Ca2N. Adv. Sci. 5, 1800666 (2018). [pdf]
22. 08/24/2018, Dr. Hu was at the 17th High Pressure Meeting of China in Changchun, Jilin.
The meeting was held by Chinese High-Pressure community every two years. Qingyang was in the high-pressure Earth science session and talked about synthesis of oxygen-rich materials in deep Earth's interior.
21. 07/20/2018, Co-authored paper "Isothermal pressure-derived metastable states in 2D hybrid perovskites showing enduring bandgap narrowing" was published by PNAS.
The work was led by Dr. Gang liu of HPSTAR. It reported a metastable phase during the decompression of 2D organic-inorganic hydrbid perovskite. Proc. Nat. Acad. Sci. U.S.A. 115, 8076-8081 (2018).
20. 05/16/2018, Dr. Hu was in Wuhan University of Technology, Hubei.
Qingyang also gave a presentation to introduce their recent research on FeO2 and FeO2Hx.
19. 05/08/2018, Dr. Hu contributed a seminar presentation at University of Science and Technology of China, Anhui.
The title of the talk is "Oxygen rich phase in Earth's deep mantle."
18. 04/27/2018, Dr. Hu was at the seminar in the Department of Physics and Astronomy, University of Nevada Las Vegas.
Qingyang gave a seminar presentation at the Uiveristy of Nevada Las Vegas with title "Earth's Oxygen rich phases".
17. 04/24/2018, Dr. Hu participated a colloquium at the Depatment of Earth Sciences, Nanjing University.
The colloquium at Nanjing University called on discussions of new advances in lower mantle chemistry, including the production of oxygen-rich domains from hydrous minerals, deep Earth's oxygen cycles and related hypothesis about Earth's geological events.
16. 04/20/2018, Dr. Hu was at Institute of Geology and Geophysics, Chinese Academy of Science
The visit was for a on-going collaboration with the group led by Dr. Liwen Deng on the deep Earth oxygen-rich mineral project. A talk was given at the same time.
15. 04/19/2018, Dr. Hu gave a talk at the Geology Seminar at Peking University.
The name of the talk was "Oxygen rich phases in Earth's deep mantle", introducing our recent progress in deep Earth chemistry.
14. 03/14/2018, Dr. Hu contributed a talk at the Deep Volatiles, Energy and Environments Summits at Shanghai.
The talk summarized our recent progress on deep mantle chemistry.
13. 12/15/2017, Dr. Hu contributed a talk at the American Geophysical Union Fall Meeting at New Orleans, LA, U.S.A.
The talk was about our theoreical work on the dehydrogenation of FeOOH at high pressure. The original work could be found here. [pdf]
12. 12/08/2017, Co-authored paper "Revealing the formation mechanism of ultrahard nanotwinned diamond from onion carbon" was published by Carbon.
The project was led by Dr. Huiyang Gou. The work conducts comprehensive studies on the formation mechanism and pressure-temperature effects on nanotiwned diamond. Carbon. 129, 159-167 (2018). [pdf]
11. 11/23/2017, "Hydrogen-bearingiron peroxide and the origin of ultralow-velocity zones" was published by Nature.
The article by Jin and co-authors raised new geoscience application of the pyriteFeO2Hx phase. The pyrite-phase is accumulating at the lowermost mantle through water and iron reaction. The slow seismic velocity travelling in FeO2Hx makes it a direct candidate to explain the mysterous ultra-low veocity zones. Liu, J., Hu, Q., Kim, D. Y., Wu, Z., Wang, W., Xiao, Y., Paul, C., Meng, Y., Prakapenka, V. B., Mao, H.-K. and Mao, W. L. Nature, 551, 494-497 (2017). [pdf]
Highligh by Sign of the Times, EurekAlert! and CIW
10. 11/14/2017, Dr. Hu contributed a talk at the 1st HYU-HPSTAR-CIS workshop at Jeju, South Korea
The talk summarized our group's recent research on the mantle oxygen reservior and volatile cyclings (like O and H) in Earth's interiors.
9. 10/03/2017, Co-authored paper "Two-Regimes of Bandgap Redshift and Partial Ambient Retention in Pressure Treated Two-dimensional Perovskites" was published by ACS Energy Letters.
The project was led by Dr. Liu Gang. The work presented the pressure effects on bandgap of 2D organic-inorganic perovskites. ACS Energy Lett. 2. 2518-2524 (2017). [pdf]
8. 09/27/2017, Dr. Hu contributed a poster at the 5th High Power Laser workshop at SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
The poster was about the dehydrogenation mechanism of FeO2Hx as in our JACS paper.
7. 09/08/2017, "When Water Meets Iron at Earth's Core-Mantle Boundary" is published by National Science Review.
In this work, Dr. Ho-kwang Mao established various chemical reactions between any iron-oxides and water at core-mantle boundary condtions. The formation of py-phase from water and the inexhaustive core iron leaves a giant mantle oxygen reservior and will lead to the long-term chemical instability of the earth. H.-K. Mao, Q. Hu, L. Yang, J. Liu, D. Y. Kim, Y. Meng, L. Zhang, V. B. Prakapenka, W. Yang and W. L. Mao. Natl. Sci. Rev. 4, 870-878 (2017). [pdf]
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6. 08/22/2017, "Hydrogen Bond Symmetrization Breakdown and Dehydrogenation Mechanism of FeO2H at High Pressure" is published by JACS.
The work combined simulation and experiment to report the transition and dehydrogenation mechanism of FeO2H under high pressure. Work was led by HPSTAR postdoc Shengcai Zhu, congratulation! S. Zhu, Q. Hu*, W. L. Mao, H.-K. Mao, H. W. Sheng. J. Am. Chem. Soc. 139, 12129-12132 (2017). [pdf]
Spotlight by JACS
5. 08/21/2017, an invited talk "Formation of FeO2 at high pressure and Earth's oxygen cycling" was presented at AIRAPT 26, Beijing.
The talk was given by Dr. Wenge Yang, who shows our previous work on the synthesis of FeO2 at Earth's mantle condition and how it can influence the cycling of elements in Earth's interiors.
4. 05/24/2017, Co-authored paper "Structural evolution behavior of manganese monophosphide under high pressure: experimental and theoretical study" was published by JPCM.
This was a collaboration work with Dr. Zhenghai Yu and Dr. Lin Wang at HPSTAR. The paper reported the structural evolution of MnP up to near megabar pressure. J. Phys. Condens. Matter, 29, 254002 (2017). [pdf]
3. 03/31/2017, "Stability limits and transformation pathways of α-quartz under high pressure" was published by PRB.
In this work, the authors reported two distinct high-pressure transition mechanism for quartz silica. In experiments, quartz followed a thermal activated pathway to a Si-O six-coordinated phase. Simulation predicted under low-tempearture condition, quartz transits to a metastable structure with oxygen body-center cubic lattice induced by phonon instability. Q. Hu, J-F. Shu, W. G. Yang, C. Park, M. W. Chen, T. Fujita, H.-K. Mao, H. W. Sheng. Phys. Rev. B 95 104112 (2017). [pdf]
2. 03/13/ 2017 Dr. Hu contributed a talk "Discovery of pyrite-structured FeO2 at high pressure" at American Physical Society March Meeting, New Orleans, LA.
In this talk, we showed recent experiment and simulation results on how hydrogen and oxygen elements are seperated and cycled in Earth's interiors.
1. 02/01/2017, "Dehydrogenation of goethite in Earth’s deep lower mantle." was published by PNAS.
In this study, the authors quantified the hydrogen content in FeO2Hx and introduced a new factor, the molecule hydrogen, will influence redox behaviors at the bottom of Earth's mantle. Q. Hu, D. Y. Kim, J. Liu, Y. Meng, L. Yang, D. Zhang, W. L. Mao, H.-K. Mao. Proc. Nat. Acad. Sci. U.S.A. 114, 1498-1501 (2017). [pdf]
Highligh by Nature Review Chemistry
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