Paramagnetic Resonance of Nickel Ions in Double-Nitrate Crystals

It is shown that there are two paramagnetic complexes for divalent nickel ions in the double-nitrate crystals. One, which has not been previously described, has a very large-zero field splitting: D = 2.25±0.10 cm—1 for 1% nickel in La2Zn3 (NO3)12·24H2O at 77°K, and it is shown that this complex is due to ions in the same site as that which produces the more anisotropic cobalt spectrum—the Y-ion site. The interaction between cerium ions and nickel ions in the other divalent site—the X-ion site—is shown to be different from the interaction of cerium and cobalt in the same site. The origin of the difference is explained qualitatively.

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