1. Thermal stability of nonmagnetic Cd and In impurities in Fe3O4.
- Author
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Sato, W., Ida, T., Komatsuda, S., Fujisawa, T., Takenaka, S., and Ohkubo, Y.
- Subjects
MAGNETITE ,METAL inclusions ,CADMIUM ,INDIUM ,THERMAL stability ,HIGH temperatures ,DENSITY functional theory - Abstract
Magnetite (Fe
3 O4 ) was doped with radioactive111m Cd and111 In ions as impurities, and their residence sites and thermal stability were investigated by means of time-differential perturbed angular correlation (TDPAC) spectroscopy. Well-defined TDPAC spectra unequivocally show their sites: Cd ions are stably located only in the tetrahedral A site in all the temperature range of the present observation (77 K-873 K); In ions also specifically occupy the A site at low temperature, but at high temperature part of them select the B site in a reversible fashion. The energy difference between the A and B sites for the accommodation of In was experimentally determined to be 0.119 (9) eV by assuming a Boltzmann distribution for the populations of the111 In probe in the respective sites. The element-dependent thermal stabilities observed for Cd and In were well corroborated by density functional theory calculations. The successful observation of thermally activated site-tosite displacement of impurity In ions in Fe3 O4 is reported. [ABSTRACT FROM AUTHOR]- Published
- 2016
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