Interface-mediated sp 2- sp 3 interconversion in ultrahard diamond-graphite nanocomposites with supertoughness

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10487236" target="_blank" >RIV/00216208:11320/24:10487236 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27740/24:10255850

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5h7mEpQaA_" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5h7mEpQaA_</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.110.134107" target="_blank" >10.1103/PhysRevB.110.134107</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Interface-mediated sp 2- sp 3 interconversion in ultrahard diamond-graphite nanocomposites with supertoughness

Popis výsledku v původním jazyce

Recently synthesized diamond-graphite nanocomposites, consisting of diamond and graphite nanodomains interlocked via coherent interfaces (termed gradia), exhibit an impressive combination of ultrahigh hardness and superior toughness [Luo et al., Nature (London) 607, 486 (2022)]. This extraordinary finding challenges the prevailing understanding of the widespread trade-off relationship in strong covalent solids, while the toughening mechanism of gradia remains mysterious. Here, we unveil an sp 2- sp 3 interconversion mechanism, where the graphitization or the bond failures are effectively suppressed through layer-by-layer migration of the interfaces towards diamond (or graphite) domains, which originates from the sequential metallization starting from the diamond atomic layers adjacent to the interface with weakened sp 3 hybridization and the associated inverse process, i.e., metal-semiconductor transition of graphite domain (sp2 to sp 3 hybridization). These interface- mediated continuous changes in the localized bonding pattern greatly promote the strain-energy dissipation, leading to a profound tolerance for large strains. Moreover, a size-dependent toughening is demonstrated, attributed to detrimental graphitization and interfacial bond breakage that occur under critically small sp 2 / sp 3 thickness. These findings provide guidance for the experimentally rational design of gradia, and the toughening mechanisms arising from interface-induced electronic structure transition also sheds light on the toughening of other hard but brittle materials through heterophase junctions.

Název v anglickém jazyce

Interface-mediated sp 2- sp 3 interconversion in ultrahard diamond-graphite nanocomposites with supertoughness

Popis výsledku anglicky

Recently synthesized diamond-graphite nanocomposites, consisting of diamond and graphite nanodomains interlocked via coherent interfaces (termed gradia), exhibit an impressive combination of ultrahigh hardness and superior toughness [Luo et al., Nature (London) 607, 486 (2022)]. This extraordinary finding challenges the prevailing understanding of the widespread trade-off relationship in strong covalent solids, while the toughening mechanism of gradia remains mysterious. Here, we unveil an sp 2- sp 3 interconversion mechanism, where the graphitization or the bond failures are effectively suppressed through layer-by-layer migration of the interfaces towards diamond (or graphite) domains, which originates from the sequential metallization starting from the diamond atomic layers adjacent to the interface with weakened sp 3 hybridization and the associated inverse process, i.e., metal-semiconductor transition of graphite domain (sp2 to sp 3 hybridization). These interface- mediated continuous changes in the localized bonding pattern greatly promote the strain-energy dissipation, leading to a profound tolerance for large strains. Moreover, a size-dependent toughening is demonstrated, attributed to detrimental graphitization and interfacial bond breakage that occur under critically small sp 2 / sp 3 thickness. These findings provide guidance for the experimentally rational design of gradia, and the toughening mechanisms arising from interface-induced electronic structure transition also sheds light on the toughening of other hard but brittle materials through heterophase junctions.

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

Physical Review B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

110

Číslo periodika v rámci svazku

13

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

134107

Kód UT WoS článku

001340495100003

EID výsledku v databázi Scopus

2-s2.0-85209224043