Abstract
The paramagnetic resonance absorption spectra of trivalent iron in double nitrate crystals have been identified and fitted by two spin Hamiltonians which correspond to the two sites into which the iron enters these crystals. The two sites appear to be the same as those occupied by trivalent chromium ions. The spin-Hamiltonian constants are reported for lanthanum zinc and cerium zinc double nitrates at temperatures of 4.2°, 77°, and 193°K. The hyperfine interaction constant for 57Fe in either site is (10.9±0.3)×10−4 cm−1 which is very close to the value anticipated for a hydrated complex.
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