1999
DOI: 10.1021/jp984132e
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Surface Defect Sites Formed on Partially and Fully Dehydrated MgO:  An EPR/ENDOR Study

Abstract: EPR and ENDOR spectroscopy have been used to investigate a variety of trapped electron centers on the surface of polycrystalline MgO. The oxide was dehydrated under vacuum at different temperatures (673-1123 K) and UV irradiated under H 2 . The dehydration process results in the formation of surface anion vacancies, which subsequently act as excess electron traps (forming color centers). A variety of such color centers have been identified. At high activation temperatures (1123 K), surface F S + (H) color cent… Show more

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Cited by 69 publications
(68 citation statements)
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“…The electron-trapped center at a site of anion vacancy is well-known as an F center (also known as a color center), which has been widely researched in MgO, [25] ZnO, [26] CaO [27] .…”
Section: Full Papermentioning
confidence: 99%
“…The electron-trapped center at a site of anion vacancy is well-known as an F center (also known as a color center), which has been widely researched in MgO, [25] ZnO, [26] CaO [27] .…”
Section: Full Papermentioning
confidence: 99%
“…Electron donation from the F S center cause a heterolytical dissociation to form a pair of H À ion and OH À groups when the surface is exposed to H 2 gas, while O 2 À ion is formed on Mg cation site when exposed to O 2 gas. 61 The one-electron paramagnetic state is also stabilized when combined with OH À groups formed nearby. This color center, termed F S þ (H) center, is created by exposure to H 2 gas and subsequent UV-irradiation.…”
Section: Stability Of Each Speciesmentioning
confidence: 99%
“…[16] In the realm of magnetic resonance spectroscopy on MgO surfaces, a way to overcome the problem of overlapping signals of electron traps is the detailed address of hyperfine coupling effects induced by the magnetic-dipole interaction between the electron spin of colour-centre electrons and the nuclear spin of neighbouring 25 Mg cations (I = 5/2) and protons (I = 1/2). The successful combination of EPR and electron nuclear double-resonance (ENDOR) [17] spectroscopy revealed a welldefined heterogeneity of trapped-electron species on activated alkaline-earth-metal oxides (MgO, CaO and SrO). [18] Among these trapped species, the (e À )(H + ) was common to all studied oxides.…”
Section: Introductionmentioning
confidence: 99%