Stability and metastability of clusters in a reactive atmosphere: Theoretical evidence for unexpected stoichiometries of MgMO x

Saswata Bhattacharya, Sergey V. Levchenko, Luca M. Ghiringhelli, Matthias Scheffler

Результат исследований: Вклад в журналСтатьярецензирование

65 Цитирования (Scopus)

Аннотация

By applying a genetic algorithm and ab initio atomistic thermodynamics, we identify the stable and metastable compositions and structures of Mg MOx clusters at realistic temperatures and oxygen pressures. We find that small clusters (M 5) are in thermodynamic equilibrium when x>M. The nonstoichiometric clusters exhibit peculiar magnetic behavior, suggesting the possibility of tuning magnetic properties by changing environmental pressure and temperature conditions. Furthermore, we show that density-functional theory with a hybrid exchange-correlation functional is needed for predicting accurate phase diagrams of metal-oxide clusters. Neither a (sophisticated) force field nor density-functional theory with (semi)local exchange-correlation functionals is sufficient for even a qualitative prediction. Published by American Physical Society. Published by the American Physical Society under the terms of the http://creativecommons.org/licenses/by/ 3.0/ Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Язык оригиналаАнглийский
Номер статьи135501
ЖурналPhysical Review Letters
Том111
Номер выпуска13
DOI
СостояниеОпубликовано - 25 сент. 2013
Опубликовано для внешнего пользованияДа

Fingerprint

Подробные сведения о темах исследования «Stability and metastability of clusters in a reactive atmosphere: Theoretical evidence for unexpected stoichiometries of MgMO x». Вместе они формируют уникальный семантический отпечаток (fingerprint).

Цитировать