Structure and transport properties of FeS at planetary core conditions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F24%3A43972932" target="_blank" >RIV/49777513:23640/24:43972932 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.epsl.2024.118959" target="_blank" >https://doi.org/10.1016/j.epsl.2024.118959</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.epsl.2024.118959" target="_blank" >10.1016/j.epsl.2024.118959</a>

Result language
angličtina
Original language name
Structure and transport properties of FeS at planetary core conditions
Original language description
The thermal conductivity of iron and its alloys are critically important to understand conductive heat flow and dynamo action within planetary cores, however the effect of sulfur alloying is poorly understood. We have measured and computed the thermal conductivity of FeS at high pressures and temperatures using experimental techniques and first-principles calculations. Experimental conditions range from 19-116 GPa and up to 3000 K. Computations ranged from 20-150 GPa and up to 4000 K. Over this range of conditions, theory shows that FeS is in a low to intermediate spin state with finite moments at least up to 40 GPa. We obtain thermal conductivity kappa from 15 W m(-1) K-1 at 1000 K to 69 W m(-1) K-1 at 4000 K from first-principles calculations, and values of 14(5)-20(10) W/m/K from experimental measurements at temperatures above 1500 K and high pressures. In both cases the effect of structure and pressure is small. We find that FeS is metallic, but a poor metal at the conditions investigated. As a result, sulfur-rich core compositions are compatible with available observational constraints on the cessation time of the Martian dynamo.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/EH22_008%2F0004572" target="_blank" >EH22_008/0004572: Quantum materials for applications in sustainable technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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