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Chemical properties of Samarium

Compounds of Samarium

The majority of the known compounds of samarium are salts derived from the basic oxide Sm2O3. They are pale yellow in colour and the absorption spectra of their solutions exhibit characteristic bands in the blue and violet. Two compounds of the type SmX2, however, are known, viz., the chloride and iodide.

The equivalent conductivities (λ) of samarium chloride and sulphate solutions at 25° C. indicate that the salts are derived from a fairly strong triacid base (v = litres per gram-equivalent): -

SmCl3v=32.5965.18130.36260.72521.441042.9
λ=107.2112.5120.8126.1131.3135.9
Sm2(SO4)3v=31.3562.70125.40250.80501.601003.2
λ=31.1743.4951.5961.3972.7689.24


The compounds of samarium have been described mainly by Cleve, whose samaria was contaminated with a little europia.

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