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1. Phase Stability and Thermal Equation of State of Iron Carbide Fe 3 C to 245 GPa

   https://doi.org/10.1029/2019GL084545  

   Hu, Xiaojun ; Fei, Yingwei ; Yang, Jing ; Cai, Yang ; Ye, Shijia ; Qi, Meilan ; Liu, Fusheng ; Zhang, Mingjian ( October 2019 , Geophysical Research Letters)

   We conducted shock wave experiments on iron carbide Fe₃C up to a Hugoniot pressure of 245 GPa. The correlation between the particle velocity (u_p) and shock wave velocity (u_s) can be fitted into a linear relationship,u_s= 4.627(±0.073) + 1.614(±0.028)u_p. The density‐pressure relationship is consistent with a single‐phase compression without decomposition. The inference is further supported by the comparison of the observed Hugoniot density with the calculated Hugoniot curves of possible decomposition products. The new Hugoniot data combined with the reported 300‐K isothermal compression data yielded a Grüneisen parameter ofγ= 2.23(7.982/ρ)^0.29. The thermal equation of state of Fe₃C is further used to calculate the density profile of Fe₃C along the Earth's adiabatic geotherm. The density of Fe₃C was found to be too low (by ~5%) to match the observed density in the Earth's inner core, and Fe₃C is unlikely a dominant component of the inner core.

    

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2. Origin and consequences of non-stoichiometry in iron carbide Fe7C3

   https://doi.org/10.2138/am-2019-6672  

   Zhu, Feng ; Li, Jie ; Walker, David ; Liu, Jiachao ; Lai, Xiaojing ; Zhang, Dongzhou ( March 2019 , American Mineralogist)
3. Superhalogens Among 3 d -Metal Compounds: M F 4 , M F 6 , M F 12 , and M F 18 ( M = Sc–Zn)

   https://doi.org/10.1021/acs.jpca.1c02884  

   Gutsev, Gennady L. ; Tibbetts, Katharine M. ; Gutsev, Lavrenty G. ; Ramachandran, Bala R. ( May 2021 , The Journal of Physical Chemistry A)
4. M–M Bond-Stretching Energy Landscapes for M 2 (dimen) 4 2+ (M = Rh, Ir; dimen = 1,8-Diisocyanomenthane) Complexes

   https://doi.org/10.1021/ic300716q  

   Hunter, Bryan M. ; Villahermosa, Randy M. ; Exstrom, Christopher L. ; Hill, Michael G. ; Mann, Kent R. ; Gray, Harry B. ( June 2012 , Inorganic Chemistry)
5. Advancing Local Distance Discrimination of Explosions and Earthquakes With Joint P/S and M L ‐M C Classification

   https://doi.org/10.1029/2021GL095721  

   Wang, Ruijia ; Schmandt, Brandon ; Holt, Monique ; Koper, Keith ( November 2021 , Geophysical Research Letters)

   Classification of local‐distance, low‐magnitude seismic events is challenging because signals can be numerous and difficult to characterize with approaches developed for larger magnitude events observed at greater distances. Yet, accurate classification is important to studies of earthquake processes and detection of potential underground nuclear tests. Here, we combine two classification metrics: the three‐component ratio of high‐frequency P/S amplitudes and the difference between local and coda duration magnitudes (M_L‐M_C). The metrics use different parts of the high‐frequency wavefield and exhibit complementary sensitivity for classification ofM∼ 0.5–4 natural earthquakes and borehole explosions, which are the best analog for underground nuclear explosions. Using means from bootstrap resampling across four diverse geologic settings, joint classification achieves >94.4% true positives and <8.4% false positives when using≥8 seismographs within 200 km of the source. This high performance is obtained without local site corrections, indicating that the method may be transportable for local event classification.

    

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