| 1. |
- Kudryavtsev, Daniil, et al.
(author)
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High-pressure chemistry of propane
- 2020
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In: Minerals. - : MDPI. - 2075-163X.
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Journal article (peer-reviewed)abstract
- This study is a comprehensive research of the propane's high-pressure and high-pressure high temperature behaviour using diamond-anvill cell technique combined with vibrational spectroscopy. As we have found, propane while being exposed to the high pressures (5-40 GPa) could exhibit three solid-solid phase transitions. With the applyimg of laser heating technique, propane could react with the formation of various hydrocarbon compounds and carbon. At temperatures less than 900 K and in the range of pressures from 3 to 22 GPa propane remains stable.
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| 2. |
- Kudryavtsev, Daniil, et al.
(author)
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Raman and IR Spectroscopy Studies on Propane at Pressures of Up to 40 GPa
- 2017
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In: Journal of Physical Chemistry A. - : AMER CHEMICAL SOC. - 1089-5639 .- 1520-5215. ; 121:32, s. 6004-6011
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Journal article (peer-reviewed)abstract
- Raman and IR spectroscopy studies on propane were performed at pressures of up to 40 GPa at ambient temperatures using the diamond anvil cell technique. Propane undergoes three phase transitions at 6.4(5), 14.5(5), and 26.5(5) GPa in Raman spectroscopy and at 7.0(5), 14.0(5), and 27.0(5) GPa in IR spectroscopy. The phase transitions were identified using the Raman and IR splitting modes and the appearance or disappearance of peaks, which clearly corresponded to the changes in the frequencies of the modes as the pressure changed. Our results demonstrate the complex high-pressure behavior of solid propane.
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| 3. |
- Kudryavtsev, Daniil, et al.
(author)
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Raman high-pressure study of butane isomers up to 40 GPa
- 2018
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In: AIP Advances. - : American Institute of Physics (AIP). - 2158-3226. ; 8:11
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Journal article (peer-reviewed)abstract
- Raman spectroscopy studies on n and i-butane were performed at pressures of up to 40 GPa at ambient temperatures using the DAC technique. Normal butane undergoes two phase transitions at 1.9(5) GPa and 2.9(5) GPa and isobutane at 2.7(5) GPa and 3.5(5) GPa. These phase transitions were identified based on observations of the splitting Raman modes and the appearance or disappearance of particular Raman peaks. Our results demonstrate the complex, high-pressure behavior of butane isomers.
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| 4. |
- Kudryavtsev, Danil, et al.
(author)
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Raman Spectroscopy Study on Chemical Transformations of Propane at High Temperatures and High Pressures
- 2020
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In: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 10:1483
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Journal article (peer-reviewed)abstract
- This study is devoted to the detailed in situ Raman spectroscopy investigation of propane C3H8 in laserheated diamond anvil cells in the range of pressures from 3 to 22 GPa and temperatures from 900 to 3000 K. We show that propane, while being exposed to particular thermobaric conditions, could react, leading to the formation of hydrocarbons, both saturated and unsaturated as well as soot. Our results suggest that propane could be a precursor of heavy hydrocarbons and will produce more than just sooty material when subjected to extreme conditions. These results could clarify the issue of the presence of heavy hydrocarbons in the Earth’s upper mantle.
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| 5. |
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| 6. |
- Serovaiskii, Aleksandr, et al.
(author)
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Fate of Hydrocarbons in Iron-Bearing Mineral Environments during Subduction
- 2019
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In: Minerals. - : MDPI. - 2075-163X. ; 9:11
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Journal article (peer-reviewed)abstract
- Subducted sediments play a key role in the evolution of the continental crust and upper mantle. As part of the deep carbon cycle, hydrocarbons are accumulated in sediments of subduction zones and could eventually be transported with the slab below the crust, thus affecting processes in the deep Earth's interior. However, the behavior of hydrocarbons during subduction is poorly understood. We experimentally investigated the chemical interaction of model hydrocarbon mixtures or natural oil with ferrous iron-bearing silicates and oxides (representing possible rock-forming materials) at pressure-temperature conditions of the Earth's lower crust and upper mantle (up to 2000(+/- 100) K and 10(+/- 0.2) GPa), and characterized the run products using Raman and Mossbauer spectroscopies and X-ray diffraction. Our results demonstrate that complex hydrocarbons are stable on their own at thermobaric conditions corresponding to depths exceeding 50 km. We also found that chemical reactions between hydrocarbons and ferrous iron-bearing rocks during slab subduction lead to the formation of iron hydride and iron carbide. Iron hydride with relatively low melting temperature may form a liquid with negative buoyancy that could transport reduced iron and hydrogen to greater depths.
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| 7. |
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