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Dynamic Effects in a New Substitutional Center of Trivalent Iron in Quartz
Author(s) -
Stegger P.,
Lehmann G.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221510206
Subject(s) - electron paramagnetic resonance , triclinic crystal system , monoclinic crystal system , hyperfine structure , center (category theory) , chemistry , quartz , ion , paramagnetism , spectral line , crystallography , nuclear magnetic resonance , materials science , atomic physics , crystal structure , condensed matter physics , physics , organic chemistry , astronomy , composite material
After exchange of Li against Na in a natural quartz of high quality by electrolysis at higher temperatures a new center of Fe 3+ with monoclinic site symmetry at room temperature is detected by electron paramagnetic resonance (EPR). At temperatures below 200 K the linewidths of the EPR spectra increase considerably, and at about 60 K a signal of a triclinic center with a well‐resolved quartet hyperfine splitting appears instead. Thus the charge‐compensating Na ion evidently changes rapidly between two equivalent positions at higher temperatures. An estimate of the activation energy for this hopping process is obtained from the temperature dependence of the linewidths for the monoclinic spectrum.