Influence of cationic ordering on the lattice dynamics of monoclinic Cu5Sn2S7 and cubic Cu5Sn2S6.65Cl0.35 sulfides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00601618" target="_blank" >RIV/68378271:_____/24:00601618 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1021/acs.jpcc.4c03489" target="_blank" >https://doi.org/10.1021/acs.jpcc.4c03489</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.4c03489" target="_blank" >10.1021/acs.jpcc.4c03489</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of cationic ordering on the lattice dynamics of monoclinic Cu5Sn2S7 and cubic Cu5Sn2S6.65Cl0.35 sulfides

Popis výsledku v původním jazyce

Cu2SnS3 is the parent compound of a series of phases in the Cu2+xSn1–xS3 section (0≤x≤0.15) of the ternary Cu–Sn–S phase diagram, the crystal structure of which can be controlled by varying the synthesis process and/or through a fine-tuning of the chemical composition. We investigate the lattice dynamics of the monoclinic ordered Cu5Sn2S7 and cubic disordered Cu5Sn2S6.65Cl0.35 compounds by temperature-dependent powder inelastic neutron scattering (INS) and heat capacity measurements. We show that the significant lowering of the lattice thermal conductivity in cubic Cu5Sn2S6.65Cl0.35 is due to a reduced phonon mean free path tied to the increased level of disorder in the unit cell. These results highlight how the stabilization of highly symmetric, yet strongly disordered crystal structures akin to those observed in high-entropy alloys, can lead to a drastic reduction in the heat transport, offering an effective approach to design high-performance thermoelectric sulfides.

Název v anglickém jazyce

Influence of cationic ordering on the lattice dynamics of monoclinic Cu5Sn2S7 and cubic Cu5Sn2S6.65Cl0.35 sulfides

Popis výsledku anglicky

Cu2SnS3 is the parent compound of a series of phases in the Cu2+xSn1–xS3 section (0≤x≤0.15) of the ternary Cu–Sn–S phase diagram, the crystal structure of which can be controlled by varying the synthesis process and/or through a fine-tuning of the chemical composition. We investigate the lattice dynamics of the monoclinic ordered Cu5Sn2S7 and cubic disordered Cu5Sn2S6.65Cl0.35 compounds by temperature-dependent powder inelastic neutron scattering (INS) and heat capacity measurements. We show that the significant lowering of the lattice thermal conductivity in cubic Cu5Sn2S6.65Cl0.35 is due to a reduced phonon mean free path tied to the increased level of disorder in the unit cell. These results highlight how the stabilization of highly symmetric, yet strongly disordered crystal structures akin to those observed in high-entropy alloys, can lead to a drastic reduction in the heat transport, offering an effective approach to design high-performance thermoelectric sulfides.

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

—

Návaznosti

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

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Svazek periodika

128

Číslo periodika v rámci svazku

33

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

14075-14084

Kód UT WoS článku

001287550300001

EID výsledku v databázi Scopus

2-s2.0-85201056735