QUANTUM-MECHANICAL STUDY OF INTERNAL STRUCTURAL TRANSFORMATIONS IN Pb-SUPERSATURATED Pb-Sn ALLOYS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00587874" target="_blank" >RIV/68081723:_____/24:00587874 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22310/24:43931334 RIV/00216224:14310/24:00138307 RIV/00216305:26620/23:PU152418

Result on the web

<a href="http://dx.doi.org/10.37904/nanocon.2023.4749" target="_blank" >http://dx.doi.org/10.37904/nanocon.2023.4749</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/nanocon.2023.4749" target="_blank" >10.37904/nanocon.2023.4749</a>

Result language

angličtina

Original language name

QUANTUM-MECHANICAL STUDY OF INTERNAL STRUCTURAL TRANSFORMATIONS IN Pb-SUPERSATURATED Pb-Sn ALLOYS

Original language description

Motivated by a decades-long controversy related to the crystal structure of Pb-supersaturated solid solutions of Pb in Sn, we have performed a quantum-mechanical study of these materials. Focusing on both body-centred-tetragonal beta-Sn and simple-hexagonal gamma-Sn structures, we have computed properties of two alloys with the chemical composition Pb5Sn11, i.e. 31.25 at. % Pb, which is close to the composition of the experimentally found alloy (30 at. % Pb). The 16-atom computational supercells were designed as multiples of the elemental beta- and gamma-Sn unit cells, where the Pb atoms were distributed according to the special quasi-random structure (SQS) concept. Full structural relaxations of both beta- and gamma-phase-based alloys resulted in very significant re-arrangements into structures which do not exhibit any apparent structural features typical for the original alloys, and are, therefore, difficult to classify. The formation energies of the beta- and gamma-phase-originating equilibrium phases are 50 meV/atom and 53 meV/atom, respectively. Therefore, they are not stable with respect to the decomposition into the elemental lead and tin. Moreover, our calculations of elastic constants of both phases revealed that they are close to mechanical instability. Our results indicate that the studied Pb-supersaturated Pb-Sn solid solutions may be prone to structural instability, transformations into different phases and decomposition. Our findings may contribute into the identification of the reason why the subsequent experimental studies did not reproduce the initial published data.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

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

Project

<a href="/en/project/GA22-05801S" target="_blank" >GA22-05801S: Causes and mechanisms of degradation of tin-based materials with a low content of alloying elements</a><br>

Continuities

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

Article name in the collection

NANOCON 2023 Conference Proceedings

ISBN

978-80-88365-15-0

ISSN

2694-930X

e-ISSN

—

Number of pages

7

Pages from-to

15-21

Publisher name

Tanger Ltd.

Place of publication

Ostrava

Event location

Brno

Event date

Oct 18, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001234125400002