Highly mobile oxygen holes in magnesium oxide

Autor:	Minoru M. Freund, Friedemann Freund, Francois Batllo
Rok vydání:	1989
Předmět:	chemistry.chemical_classification Electron mobility Materials science Magnesium Analytical chemistry General Physics and Astronomy chemistry.chemical_element Dielectric Space charge Surface conductivity chemistry Vacancy defect Surface charge Inorganic compound
Zdroj:	Physical Review Letters. 63:2096-2099
ISSN:	0031-9007
DOI:	10.1103/physrevlett.63.2096
Popis:	High-purity MgO exhibits an unexpected giant anomaly of the apparent static dielectric constant and a positive surface charge of the order of 5 x 10 to the 21st/cu cm in the top 15 nm. It is postulated that the MgO matrix contains traces of peroxy defects, O2(2-), associated with Mg(2+) vacancies. Above approximately 400 C the O2(2-) dissociates to vacancy bound O(-) and highly mobile O(-) states, which diffuse to the surface, giving rise to a high surface conductivity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9dfc6e2cb0d106e77c98c08a2fbf7df https://doi.org/10.1103/physrevlett.63.2096 Zobrazit plný text záznamu