Stoichiometry and morphology of MgO films grown reactively on Ag(100)

Wollschläger, J.; Viernow, J.; Tegenkamp, Christoph; Erdös, D.; Schröder, Klaus; Pfnür, H.

doi:10.1016/s0169-4332(98)00656-4

Cited by 84 publications

(62 citation statements)

References 14 publications

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“…No splitting of the O 1s and of the Mg(KLL) peaks has been observed that would be characteristic for metallic or non-stoichiometric components. 6 Therefore, we conclude that only stoichiometric MgO has been formed during our preparation.…”

Section: Resultsmentioning

confidence: 80%

“…Several studies have been carried out for magnesium oxide. [6][7][8][9] They form the basis for well defined studies of defect properties, so that a direct comparison with the wealth of theoretical results will be possible. In several theoretical papers [10][11][12][13] the properties of surface color centers F s on MgO have been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Formation of surface color centers at differently coordinated sites: MgO/Ag(1,1,19)

2003

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In order to find criteria for discrimination between surface color centers at terraces and steps, and bulk color centers, the characteristic losses of these centers have been investigated by electron energy loss spectroscopy on an epitaxial MgO film grown on a Ag ͑1,1,19͒ surface. This film contains a significantly higher step density compared with a film grown on Ag͑100͒. The generation of four distinct losses at 2.0, 2.4, 2.8, and 3.4 eV and a broad loss centered at 5.5 eV have been observed that are induced by electron bombardment of the MgO surface. The latter loss is attributed to bulk color centers (F b centers͒. By comparing the measured loss energies with experiments performed on MgO/Ag͑100͒ and with theoretical literature data, the observed losses at 2.0 and 2.8 eV can be consistently assigned to transitions of color centers located on step sites, whereas those at 2.4 and 3.4 eV are attributed to terrace sites. The kinetics of color center formation during electron bombardment, as well as the annihilation of F centers by simple exposure to O 2 gas at room temperature, was determined and compared for differently coordinated color centers. While all surface color centers follow the same kinetics, we show that the F b centers can only decay as long as the existence of surface color centers provides active sites for dissociating oxygen molecules. This corroborates the assignment of F b centers.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Formation of surface color centers at differently coordinated sites: MgO/Ag(1,1,19)

2003

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“…In order to grow a MgO layer on Ag(001), Wollschläger et al used a two-step process, Mg deposition followed by oxidation (i.e., post-oxidation), which was compared to the reactive oxidation method. 10 On the Ag(001) surface, the post-oxidized film shows small amount of non-stoichiometric species, which are reduced through additional annealing to 700 K. However, only the MgO film grown by reactive oxidation is well aligned while post-oxidation leads to three different kinds of rotational domains due to the hexagonal structure of the Mg film. 10 In the present study, the growth condition of MgO epitaxy on the Fe(001) surface has been searched through optimizing the growth conditions with in-situ scanning tunneling microscopy (STM).…”

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confidence: 99%

“…In order to get a more uniform Mg layer through reducing 2-ML MgO clusters and non-stoichiometric species, which might exist as on the Ag(001) surface, 10 the substrate was additionally annealed at 400 • C for 10 min. 10 Figure 2 image of the post-oxidized and additionally annealed Mg/Fe(001) substrate. For getting this image, a bias voltage as high as −5 V was needed, which means that the Fe(001) surface is covered with MgO layers.…”

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confidence: 99%

Growth of a crystalline and ultrathin MgO film on Fe(001)

Dugerjav¹,

Kim²,

Seo³

2011

AIP Advances

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The narrow temperature-window for obtaining a crystalline MgO film on Fe(001) has been found using in-situ STM. When Mg was deposited on Fe(001) at RT, post-oxidized at 300 °C, and additionally annealed at 400 °C, an ultrathin and crystalline MgO film was formed. It has been concluded that, in order to grow a high-quality and crystalline MgO film on Fe(001), it requires two steps, i.e., Mg film formation on the substrate at RT and subsequent annealing at the proper substrate temperature under O2 exposure for Mg atoms to be oxidized and crystallized at their deposited sites without being agglomerated

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“…Alternatively one can use thin, sufficiently conducting MgO films grown on different single crystals. 19,20 Sample heating and concomitant excitation of electrons into the conduction band can also be sufficient to overcome charging. 21 …”

Section: Insulating Samplesmentioning

confidence: 99%

UHV and Ambient Pressure XPS: Potentials for Mg, MgO, and Mg(OH)2 Surface Analysis

Head

Schnadt

2016

JOM

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The surface sensitivity of x-ray photoelectron spectroscopy (XPS) has positioned the technique as a routine analysis tool for chemical and electronic structure information. Samples ranging from ideal model systems to industrial materials can be analyzed. Instrumentational developments in the past two decades have popularized ambient pressure XPS, with pressures in the tens of mbar now commonplace. Here, we briefly review the technique, including a discussion of developments that allow data collection at higher pressures. We illustrate the information XPS can provide by using examples from the literature, including MgO studies. We hope to illustrate the possibilities of ambient pressure XPS to Mg, MgO, and Mg(OH) 2 systems, both in fundamental and applied studies.

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Stoichiometry and morphology of MgO films grown reactively on Ag(100)

Cited by 84 publications

References 14 publications

Formation of surface color centers at differently coordinated sites: MgO/Ag(1,1,19)

Formation of surface color centers at differently coordinated sites: MgO/Ag(1,1,19)

Growth of a crystalline and ultrathin MgO film on Fe(001)

UHV and Ambient Pressure XPS: Potentials for Mg, MgO, and Mg(OH)2 Surface Analysis

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