Structure and transport properties of FeS at planetary core conditions

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Structure and transport properties of FeS at planetary core conditions

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Structure and transport properties of FeS at planetary core conditions

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/EH22_008%2F0004572" target="_blank" >EH22_008/0004572: Kvantové materiály pro aplikace v udržitelných technologiích</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Earth and Planetary Science Letters

ISSN

0012-821X

e-ISSN

1385-013X

Svazek periodika

646

Číslo periodika v rámci svazku

NOV 15 2024

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

001309447300001

EID výsledku v databázi Scopus

2-s2.0-85203005708