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Buried (Fe1 −x Co x )Si2 layers with variable band gap formed by ion beam synthesis (1996)

Panknin, D. ; Wieser, E. ; Skorupa, W. ; [et al.]

Springer

Applied physics 62 (1996), S. 155-162

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ISSN: 1432-0630

Keywords: 68.55 ; 73.60 ; 78.65

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract Buried layers of (Fe1 −x Co x )Si2 were prepared by sequent implantation of iron and cobalt into (100) silicon. The depth distributions of iron and cobalt and the atomic concentration ratio silicon/metal were determined by Auger Electron Spectroscopy (AES) and Rutherford Backscattering Spectrometry (RBS). The phase composition and the microstructure of the silicide layer were studied by X-ray diffraction and electron microscopy. The band gap energy was evaluated from Infrared (IR) reflection and transmission experiments. The semiconductingβ-FeSi2 structure remains stable up to a cobalt fraction ofx = 0.2 if the iron silicide is stabilized by an intermediate annealing between iron and cobalt implantation. With increasing cobalt content, the electrical resistivity as well as the energy of the direct band gap of the (Fe1 −x Co x )Si2 layer decrease. In this way, a band gap tuning between 0.84 and 0.70 eV is possible. The gap energy is found to vary quadratically with the Co content in the composition range 0 〈x 〈 0.15.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01575713

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Fe(III)-Komplexe mit „gemischter“ Koordinationssphäre aus Oxalat- und Phenolat-Liganden (1979)

Roewer, G. ; Kempe, G. ; Kretschmer, K. ; [et al.]

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 75-85

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ISSN: 0021-8383

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Fe(III)-Complexes with Mixed Ligands Consisting of Oxalate and Phenolate LigandsThe formation of mixed-ligand complexes between iron(III) ion, potassium oxalate and potassium salts of salicylic acid, sulfosalicylic acid, catechol, sodium 3,5-sulfocatechol („tiron“) and tetrachlorocatechol, respectively, has been investigated. There were obtained solid products with the approximate composition K3[Fe(C2O4)3-xLx] · n H2O (L = phenolat; x = 1; 2). For the synthesis of the above compounds ligand exchange reactions as well as addition-technique of oxalic acid followed by potassium phenolat to Fe2O3 · aq has been used. Through spectroscopic examination of the obtained products was found, that Fe3+-ion is simultaneously coordinated by oxalat and phenolat. Probably the products consist of at least two components as Fe(III) was found in two different bond states.

Additional Material: 2 Ill.