S U Cheema and M J A Smith 1971 J. Phys. C: Solid State Phys. 4 1231 doi:10.1088/0022-3719/4/10/031
S U Cheema and M J A Smith
Show affiliationsEuropium added to silver chloride under a nonoxidizing atmosphere enters the lattice substitutionally in the divalent state. A single silver ion vacancy is associated with each europium ion in a nearest cation position at 93 K and leads to an electron resonance which shows orthorhombic symmetry. At room temperature most of the vacancies are dissociated and the predominant spectrum arises from Eu2+ in a field of octahedral symmetry. The temperature variation in the width of lines which constitute the outer fine structure components of the spectrum gives an activation energy of 0.22+or-0.05 eV for the vacancy motion. In heavily doped specimens a single line spectrum is observed from aggregated europium. Eu2+ is found to sensitize silver chloride in the bulk. At room temperature irradiation with blue light produces a reduction in the number of Eu2+ ions and an optical absorption peak at 550 nm due to silver colloid, Irradiation with red light bleaches the colloid band and restores the original number of Eu2+ ions.
Issue 10 (30 July 1971)
S U Cheema and M J A Smith 1971 J. Phys. C: Solid State Phys. 4 1231
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