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510 results on '"Wagner, F. E."'

72. Archaeometry at the PGAA facility of MLZ - Prompt gamma-ray neutron activation analysis and neutron tomography

Author

Kluge, E. J., Stieghorst, C., Wagner, F. E., Gebhard, R., Revay, Zs., Jolie, J., Kluge, E. J., Stieghorst, C., Wagner, F. E., Gebhard, R., Revay, Zs., and Jolie, J.

Abstract

Instrumental neutron techniques such as Prompt Gamma-ray Activation Analysis and Neutron Tomography and their combination, are effective methods to obtain chemical compositions with good detection limits and visualize internal structures within a sample. As non-destructive analysis methods, they are especially suitable for the investigation of cultural heritage objects and are therefore attractive for the field of archaeometry. This article reports on the investigation of two ring-like Celtic burial gifts from the Bavarian region using these methods. In contrast to our initial presumption, the two rings were not made in the same way. Our results clearly show completely different compositions and internal structures.

Published
2018

75. Mössbauer studies of metal-hydrogen systems

Author

Wagner, F. E., Wortmann, G., Amelinckx, S., editor, Chebotayev, V. P., editor, Gomer, R., editor, Ibach, H., editor, Letokhov, V. S., editor, Lotsch, H. K. V., editor, Queisser, H. J., editor, Schäfer, F. P., editor, Seeger, A., editor, Shimoda, K., editor, Tamir, T., editor, Welford, W. T., editor, Wijn, H. P. J., editor, Alefeld, Georg, editor, and Völkl, Johann, editor

Published
1978
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76. New Ruthenium Complexes for the Treatment of Cancer

Author

Keppler, B. K., Henn, M., Juhl, U. M., Berger, M. R., Niebl, R., Wagner, F. E., Baulieu, Etienne, editor, Forman, Donald T., editor, Ingelman-Sundberg, Magnus, editor, Jaenicke, Lothar, editor, Kellen, John A., editor, Nagai, Yoshitaka, editor, Springer, Georg F., editor, Träger, Lothar, editor, Will-Shahab, Liane, editor, and Wittliff, James L., editor

Published
1989
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80. Magnetic Studies on New Mixed-Valence Phosphates Zn2+Fe23+(P2O7)2 and Zn0.52+Cu0.52+Fe23+(P2O7)2.

Author

Oulmekki, A., Elghadraoui, E. H., Lamsaf, H., Fausto, R., Wagner, F. E., and Costa, B. F. O.

Subjects
PYROPHOSPHATES, PHOSPHATES, MOSSBAUER spectroscopy, MAGNETOMETERS
Abstract

Structural studies of Zn2+Fe 2 3 + (P2O7)2 and Cu0.5Zn0.5Fe2(P2O7)2 were made using powder X-ray diffraction and refined by Rietveld method. Both phosphates crystallize in an orthorhombic structure with Pnma space group. Magnetometry measurements showed that below TN = 5.6 (1), Zn2+Fe 2 3 + (P2O7)2 becomes antiferromagnetic and the TN = 14 K is attributed to Cu0.5Zn0.5Fe2(P2O7)2. Mössbauer studies at room temperature and low temperature were performed in both samples. [ABSTRACT FROM AUTHOR]

Published
2019
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82. Magnetism of ternary compounds RE6Fe13X; RE=Pr, Nd; X=Cu, Ag, Au, Zn, Cd, and Hg.

Author

Weitzer, F., Leithe-Jasper, A., Rogl, P., Hiebl, K., Rainbacher, A., Wiesinger, G., Steiner, W., Friedl, J., and Wagner, F. E.

Subjects
MAGNETISM, METALS, CRYSTALS
Abstract

Presents a study which observed the magnetism of ternary compounds RE[sub6]Fe[sub16]X (X=Cu, Ag, Au, Zn, Cd, Hg). Details on the experiment; Information on the compound formation and structural chemistry; Refinement of the crystal structure of Nd[sub6]Fe[sub13]Au.

Published
1994
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83. Study of tin amalgam mirrors by 119 Sn Mössbauer spectroscopy and other analytical methods

Author

Lerf, A., Wagner, F. E., Herrera, L. K., Justo, Ángel, Muñoz-Páez, Adela, Pérez-Rodríguez, José Luis, Lerf, A., Wagner, F. E., Herrera, L. K., Justo, Ángel, Muñoz-Páez, Adela, and Pérez-Rodríguez, José Luis

Abstract

From the beginning of the 16 until the end of the 19 century the most widely used mirrors consisted of a pane of glass backed with a reflecting layer of tin-mercury amalgam. They were made by sliding the glass pane over a tin foil covered with liquid mercury. After removal of the superfluous mercury, tin amalgam formed slowly at ambient temperature and yielded a reflecting layer adhering to the surface of the glass. Such mirrors often deteriorate in the course of time by oxidation of the tin in the amalgam to stannous or stannic oxide. Sn Mössbauer spectroscopy, scanning electron microscopy, micro-XRF and X-ray diffraction have been used to study this deterioration process. The studied specimens were a modern mirror made for the reconstruction of the Green Vault in Dresden in the early 2000s, two rather well preserved German mirrors from the 17 and 19 centuries and several strongly deteriorated specimens of Baroque mirrors from the south of Spain. The modern mirror consists mainly of a SnHg amalgam with only 2 % of SnO. The older German mirrors showed more pronounced oxidation, containing 12 and 15 % of SnO, which did not noticeably impair their reflectivity. In the samples from the Spanish mirrors at best a few percent of metallic phase was left. The majority of the tin had oxidised to SnO, but between 8 and 20 % of the tin was present as SnO. X-ray diffraction yielded similar results and micro-XRF mapping using synchrotron radiation for excitation gave information on the distribution of Sn and Hg in the reflecting layer of the mirrors.

Published
2016

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