Abstract
Stepwise amorphization of a low-level doped α-Al2O3 single crystal yielded powders without changes of the concentration and chemical nature of the dopants. Kind and degree of disturbances could be unambiguously monitored by the allowed and forbidden transitions of the Fe3+-cw-EPR in X-band using a Bruker bimodal cavity. Based on simulations diagonalizing the spin Hamiltonian forS = 5/2 it was possible to discriminate between regions as well as samples of structural order and disorder. The spectral pattern of the allowed and forbidden transitions of Fe3+ ions together with the field-position-dependent saturation behaviour (4.2 K) allowed us to differentiate between crystalline and amorphous components or regions of a sample.
Similar content being viewed by others
References
Weil J.A., Bolton J.R., Wertz J.E.: Electron Paramagnetic Resonance — Elementary Theory and Practical Applications. New York: J. Wiley & Sons 1994.
Pilbrow J.R.: Transition Ion Electron Paramagnetic Resonance. New York: Clarendon Press 1990.
Altschuler S.A., Kosyrev B.M.: Electron Paramagnetic Resonance. Moscow: Phys.-Math. Lit. 1961;
Abragam A., Bleaney B.: Electron Paramagnetic Resonance of Transition Ions. Oxford: Clarendon Press 1970.
Stösser R., Nofz M.: Glastech. Ber. Glass Sci. Technol.67, 156 (1994)
Nofz M., Stösser R., Popp P. in: Proc. of the 2nd Conf. of the Europ. Soc. of Glass Science and Technology, pp. 187–192, 523–526. Venice, Italy, 21–24 June 1993. Venice: Stazione Sperimentale del Vetro 1993.
Shaik S., Filatov M., Schröder D., Schwarz H.: Chem. Eur. J.4(2) 193 (1998).
Wiesner R., Rathmann J., Holzhütter H.-G., Stösser R., Mader K., Nolting H., Kühn H.: FEBS Lett.383, 229 (1996)
Stösser R., Scholz G.: Appl. Magn. Reson.12, 167 (1997)
Wassermann K., Palm R., Lunk H.-J., Fuchs J., Steinfeldt N., Stösser R.: Inorg. Chem.34, 5029 (1995)
Stösser R., Scholz G., Nofz M., Grande T., Aasland S.: Ber. Bunsenges. Phys. Chem.100, 1588 (1996)
Scholz G., Stösser R., Grande T., Aasland S.: Ber. Bunsenges. Phys. Chem.101, 1291 (1997)
Backs D., Stösser R., Lieberenz M.: Phys. Status Solidi B131, 291 (1985)
Ernst R.: Ph.D. Thesis, Ernst-Moritz-Arndt Universität Greifswald, Greifswald, Germany 1990; Stösser R., Bartoll J., Schirrmeister L., Ernst R., Lück R.: Appl. Radiat. Isot.47, 1489 (1996)
Lück R.: Thesis B., Academy of Sciences, Berlin, Germany 1989.
Stösser R., Nofz M., Gessner W., Schröter Ch., Kranz G.: J. Solid State Chem.81, 152 (1989)
Stösser R., Brenneis R., Ebert I.: J. Mater. Sci.25, 223 (1990)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Stösser, R., Scholz, G. Fe3+ ions in amorphous solids: EPR on mechanically and chemically amorphized Al2O3 . Appl. Magn. Reson. 15, 449–468 (1998). https://doi.org/10.1007/BF03162028
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF03162028