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1

Digitale Medien

The evolution of sputtered iron nitride thin films under thermal treatment (1991)

Mosca, D. H. ; Teixeira, S. R. ; Dionisio, P. H. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 261-267

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The thermal evolution of reactively sputtered iron nitride thin films has been investigated by x-ray diffraction, Mössbauer conversion electron spectroscopy, transmission electron microscopy, and magnetic measurements. The results show that, independently of the original nitrogen content of the films, a similar composition of the end products after the 500 °C annealings is reached, being all composed of α-Fe plus γ'-Fe4N in a wide range of relative proportions. The magnetic characteristics, however, are different depending on the nitrogen content of the as-deposited films.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.347761

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2

Digitale Medien

Comparative study of intermetallic phases formed by direct ion implantation and radiation enhanced diffusion of tin in two kinds of steel (1985)

Dionisio, P. H. ; de Barros, B. A. S. ; Baumvol, I. J. R.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 58 (1985), S. 773-778

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The surface layers of high-carbon and stainless steel samples, treated by both direct ion implantation of Sn+ ions and radiation enhanced diffusion of tin, are analyzed by means of Rutherford backscattering and 119Sn and 57Fe conversion electron Mössbauer spectroscopy. The intermetallic phases formed in the treated surfaces are determined and their thermal evolution is established. The compositions and phase transformations observed in the surfaces of the samples treated by both direct ion implantation and radiation-enhanced diffusion are very similar, and this similarity indicates that these two treatment processes are essentially equivalent for practical applications.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.336195

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3

Digitale Medien

Compositional and magnetic properties of iron nitride thin films (1990)

Mosca, D. H. ; Dionisio, P. H. ; Schreiner, W. H. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 67 (1990), S. 7514-7519

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The compositional and magnetic properties of iron-nitride thin films deposited by dc reactive magnetron sputtering under various nitrogen partial pressure conditions have been investigated by x-ray diffraction, Mössbauer and Auger electron spectroscopy as well as magnetic measurements. The x-ray diffraction patterns indicate a mixed phase composition. 57Fe Mössbauer spectroscopy shows that part of the nitrogen atoms are randomly distributed on interstitial sites with the formation of nonstoichiometric compounds. The excessive width of the Mössbauer lines indicates the degree of disorder of the different iron nitride precipitates. The nitrogen concentration as a function of depth is obtained by sputter-etched Auger electron spectroscopy. Furthermore, the ferromagnetic films show moderate saturation magnetization and coercivities at room temperature as compared with pure iron thin films.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.345812

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4

Digitale Medien

Mössbauer study of hydrogenated amorphous germanium-tin thin-film alloys (1989)

Chambouleyron, I. ; Marques, F. C. ; Dionisio, P. H. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 66 (1989), S. 2083-2090

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: This work reports on the structure of defects around Sn atoms in amorphous germanium-tin alloys deposited by the rf sputtering of compound targets. The influence of atomic hydrogen on the structure of such defects is reported for the first time. The samples were analyzed by Rutherford backscattering spectrometry and conversion electron Mössbauer spectroscopy. The main conclusion of this research is that, besides the known substitutional position of Sn atoms in the a-Ge network, a new Sn bonding configuration appears, which may be at the origin of the degradation of the optoelectronic properties of the alloy found experimentally. This new configuration is an octahedrally coordinated Sn atom resulting from the trapping of Ge vacancies by Sn atoms, the energetically favored final site being the tin atom in the center of the Ge relaxed divacancy.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.344301

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5

Digitale Medien

Thermal evolution and aging of Co-sputtered iron-tin thin films (1991)

Dionisio, P. H. ; Vasquez, A. ; Hallouche, B. ; [weitere]

Springer

Hyperfine interactions 67 (1991), S. 493-499

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ISSN: 1572-9540

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The composition, structure, magnetic properties and stability of iron-tin thin films produced by co-evaporation with de magnetron sputtering are studied. Rutherford backscattering. Auger electron spectroscopy. X-ray diffraction and conversion electron Mössbauer spectroscopy indicate the formation of a homogeneous solid solution of tin in iron with a concentration well above the limit of equilibrium solid solubility. Measurements with a vibrating-sample magnetometer show that the films present saturation magnetization and remanence similar to those of pure iron, but a much smaller coercivity. Thermal treatment or aging lead to second-phase precipitation, which is accompanied by a growth of coercivity and remanence.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02398190

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6

Digitale Medien

Thermal evolution and stability of a tin nitride obtained by reactive sputtering (1994)

Lima, R. S. ; Dionísio, P. H. ; Moro, J. T. ; [weitere]

Springer

Hyperfine interactions 83 (1994), S. 315-319

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ISSN: 1572-9540

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Tin nitride obtained by reactive magnetron sputtering was annealed at several temperatures to study the thermal evolution and stability of the compound. X-ray diffraction, thermal effusion and conversion electron Mössbauer spectrometry were used to characterize the events. The nitride has different stabilities, depending on the ambient conditions under which the annealings are performed. Apparently only one crystallographic phase of the nitride is present before it disproportionates.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02074292

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