DEFECT CENTERS INDUCED BY EVAPORATION OF ALKALI AND ALKALINE-EARTH METALS ON MAGNESIUM-OXIDE - AN EPR STUDY

被引：58

作者：

GIAMELLO, E

FERRERO, A

COLUCCIA, S

ZECCHINA, A

机构：

[1] Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Università di Torino, 10125 Torino

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1991年 / 95卷 / 23期

关键词：

D O I：

10.1021/j100176a064

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Defect centers created at the surface of polycrystalline, high-area magnesium oxide by evaporation of lithium and magnesium have been investigated by EPR. Both paramagnetic F(s)+ and diamagnetic F(s) centers, respectively consisting of one and two electrons trapped in surface ionic vacancies, are formed. The first type of center is preferentially formed with lithium, whereas the second prevails with magnesium. A fraction of the surface sites acting as surface electron traps is anion vacancies existing at the surface of activated MgO and a second fraction consists of "reconstructed sites" involving cations derived from the metal ionization.

引用

页码：9385 / 9391

页数：7