Hong Yang is currently a PhD student in Geological Science working with Wendy L. Mao. He joined Mao’s lab at Stanford University in 2018, after finishing his Master’s Degree at HPSTAR, Shanghai, where he was supervised by Jung-Fu Lin. His Master’s thesis focused on the experimental determination of iron isotopic fractionation behavior of lower mantle phases using the Synchrotron X-ray technique NRIXS. Before that, he was an undergraduate majoring in Geochemistry at the University of Science and Technology of China. There he performed the quality assessment of bottled drinking water and water from Lake Chao under Fang Huang’s supervision.
Hong’s research interests include the chemical (especially isotopic) evolution of the Earth and other planetary bodies; structure and sound velocities of iron-alloys at high pressure; pressure-induced electronic, magnetic, elastic and structural transitions in materials; as well as high pressure photon science. His recent research was published on Earth Planet. Sci. Lett. 506, 113-122 (2019), entitled “Iron isotopic fractionation in mineral phases from Earth’s lower mantle: Did terrestrial magma ocean crystallization fractionate iron isotopes?”.
Education & Certifications
Master of Science, Center for High Pressure Science and Technology Advanced Research (HPSTAR), Condensed Matter Physics (2018)
Bachelor of Natural Science, University of Science and Technology of China, Geochemistry (2015)
Hong loves outdoor activities off the beaten path. He was the president of Students’ Nature Preservation Association at USTC in 2014 and organized activities including lake water sampling and bird watching. He enjoys travel to national parks, geological parks and nature preserves. He is also a fan of Chinese history with special interest in the study of the “Silk Road”, Dunhuang Caves and the Hsi Hsia empire. His favorite musicians are Yanni, Mayday, Jay Chou, Leehom Wang, Fish Leong and Hebe Tien.
High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide
2021; 14 (13)
Simultaneous high-pressure Brillouin spectroscopy and powder X-ray diffraction of cerium dioxide powders are presented at room temperature to a pressure of 45 GPa. Micro- and nanocrystalline powders are studied and the density, acoustic velocities and elastic moduli determined. In contrast to recent reports of anomalous compressibility and strength in nanocrystalline cerium dioxide, the acoustic velocities are found to be insensitive to grain size and enhanced strength is not observed in nanocrystalline CeO2. Discrepancies in the bulk moduli derived from Brillouin and powder X-ray diffraction studies suggest that the properties of CeO2 are sensitive to the hydrostaticity of its environment. Our Brillouin data give the shear modulus, G0 = 63 (3) GPa, and adiabatic bulk modulus, KS0 = 142 (9) GPa, which is considerably lower than the isothermal bulk modulus, KT0∼ 230 GPa, determined by high-pressure X-ray diffraction experiments.
View details for DOI 10.3390/ma14133683
View details for Web of Science ID 000670971500001
View details for PubMedID 34279253
- Noble gas incorporation into silicate glasses: implications for planetary volatile storage GEOCHEMICAL PERSPECTIVES LETTERS 2021; 17: 1-5
- Iron force constants of bridgmanite at high pressure: Implications for iron isotope fractionation in the deep mantle GEOCHIMICA ET COSMOCHIMICA ACTA 2021; 294: 215–31
- Iron isotopic fractionation in mineral phases from Earth's lower mantle: Did terrestrial magma ocean crystallization fractionate iron isotopes? (vol 506, 113, 2019) EARTH AND PLANETARY SCIENCE LETTERS 2019; 524
Carbon isotopic signatures of super-deep diamonds mediated by iron redox chemistry
Geochemical Perspectives Letters
2019; 10: 51-55
View details for DOI 10.7185/geochemlet.1915
Iron isotopic fractionation between silicate mantle and metallic core at high pressure
The +0.1‰ elevated (56)Fe/(54)Fe ratio of terrestrial basalts relative to chondrites was proposed to be a fingerprint of core-mantle segregation. However, the extent of iron isotopic fractionation between molten metal and silicate under high pressure-temperature conditions is poorly known. Here we show that iron forms chemical bonds of similar strengths in basaltic glasses and iron-rich alloys, even at high pressure. From the measured mean force constants of iron bonds, we calculate an equilibrium iron isotope fractionation between silicate and iron under core formation conditions in Earth of ∼0-0.02‰, which is small relative to the +0.1‰ shift of terrestrial basalts. This result is unaffected by small amounts of nickel and candidate core-forming light elements, as the isotopic shifts associated with such alloying are small. This study suggests that the variability in iron isotopic composition in planetary objects cannot be due to core formation.
View details for DOI 10.1038/ncomms14377
View details for Web of Science ID 000394455700001
View details for PubMedID 28216664