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DOI	10.1029/2020JB020074
	Equation of State of TiN at High Pressures and Temperatures: A Possible Host for Nitrogen in Planetary Mantles
	Daviau K.; Fischer R.A.; Brennan M.C.; Dong J.; Suer T.-A.; Couper S.; Meng Y.; Prakapenka V.B.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	Nitrogen, the most abundant element in Earth's atmosphere, is also a primary component of solid nitride minerals found in meteorites and on Earth's surface. If they remain stable to high pressures and temperatures, these nitrides may also be important reservoirs of nitrogen in planetary interiors. We used synchrotron X-ray diffraction to measure the thermal equation of state and phase stability of titanium nitride (TiN) in a laser-heated diamond anvil cell at pressures up to ∼70 GPa and temperatures up to ∼2,500 K. TiN maintains the cubic B1 (NaCl-type) crystal structure over the entire pressure and temperature range explored. It has K0 = 274 (4) GPa, K0′ = 3.9 (2), and γ0 = 1.39 (4) for a fixed V0 = 76.516 (30) Å3 (based on experimental measurements), q = 1, and θ0 = 579 K. Additionally, we collected Raman spectra of TiN up to ∼60 GPa, where we find that the transverse acoustic (TA), longitudinal acoustic (LA), and transverse optical phonon modes exhibit mode Grüneisen parameters of 1.66(17), 0.54(15), and 0.93 (4), respectively. Based on our equation of state, TiN has a density of ∼5.6–6.4 g/cm3 at Earth's lower mantle conditions, significantly more dense than both the mantle of the Earth and the estimated densities of the mantles of other terrestrial planets, but less dense than planetary cores. We find that TiN remains stable against physical decomposition at the pressures and temperatures found within Earth's mantle, making it a plausible reservoir for deep planetary nitrogen if chemical conditions allow its formation. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	deep-earth nitrogen; diamond anvil cell; high pressure; nitrides; thermal equation of state; TiN
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187355
作者单位	Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Now at School of Science, University of Waikato, Tauranga, New Zealand; Now at Toi-Ohomai Institute of Technology, Tauranga, New Zealand; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States; HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, IL, United States; Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, United States
推荐引用方式 GB/T 7714	Daviau K.,Fischer R.A.,Brennan M.C.,et al. Equation of State of TiN at High Pressures and Temperatures: A Possible Host for Nitrogen in Planetary Mantles[J],2021,126(2).
APA	Daviau K..,Fischer R.A..,Brennan M.C..,Dong J..,Suer T.-A..,...&Prakapenka V.B..(2021).Equation of State of TiN at High Pressures and Temperatures: A Possible Host for Nitrogen in Planetary Mantles.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Daviau K.,et al."Equation of State of TiN at High Pressures and Temperatures: A Possible Host for Nitrogen in Planetary Mantles".Journal of Geophysical Research: Solid Earth 126.2(2021).