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Samarium hexaboride (SmB6) is an intermediate-valence compound where samarium is present both as Sm2+ and Sm3+ ions at the ratio 3:7.It belongs to a class of Kondo insulators.
S 1155 (OTTO) Samarium boride, 99.9% Cas 12008-30-9 - used in optical glass to absorb infrared light.