Gd/sup 3 +/ EPR probe of the determination of the valence states
The theory of the Gd/sup 3 +/ probe EPR technique is reviewed. This technique was employed to investigate at 9.2 GHz the Gd/sup 3 +/ EPR in 0.1 at. percent GdS in TmS, 1 at. percent GdTe in TmTe, and 1 at. percent GdSe in TmSe. From the temperature dependence of the Gd/sup 3 +/ EPR linewidth, it is concluded that Tm in TmS is trivalent with a singlet-ground-state. The temperature variation of the Gd/sup 3 +/ linewidth in TmTe was interpreted in terms of the ''delocalization'' of the extra electron ''localized'' around Gd/sup 3 +/. From the linewidth and g-value data, it is shown that Tm in TmTe is divalent. The linewidth and the g-value of the Gd/sup 3 +/ resonance in TmSe were found to be independent of temperature. These striking results were explained in terms of the ''motional narrowing'' effect attributed to the interconfigurational fluctuations of Tm in TmSe.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7318356
- Report Number(s):
- LA-UR-76-2475; CONF-761150-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ATOMIC IONS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
ELECTRON SPIN RESONANCE
ELECTRONIC STRUCTURE
ENERGY LEVELS
FLUCTUATIONS
GADOLINIUM IONS
GROUND STATES
GYROMAGNETIC RATIO
IONS
KINETICS
LINE WIDTHS
MAGNETIC RESONANCE
RARE EARTH COMPOUNDS
RESONANCE
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TELLURIDES
TELLURIUM COMPOUNDS
TEMPERATURE DEPENDENCE
THULIUM COMPOUNDS
THULIUM SELENIDES
THULIUM SULFIDES
THULIUM TELLURIDES
VALENCE
VARIATIONS