EUROPIUM(II) SELENIDE: Crystal Structure

EUROPIUM(II) SELENIDE consists of the elemental system Eu-Se forming black (or brown) cubic conjugated crystals with the space group Fm3m, cell parameter a = 0.6185 nm and Z = 4. It is ferromagnetic at the Curie temperature of 7 K. It has been shown to have a high degree of ferrimagnetism.

Synthesis, Structural, and Optical Characterization of a New Europium(II) Tin Selenide, Eu8(Sn4Se14)(Se3)2 with a (Sn4Se14)12– Building Block

A new phase in europium-tin-chalcogenide chemistry has been prepared using the reactive flux method: Eu8(Sn4Se14)(Se3)2. The compound crystallizes in the orthorhombic space group P21212 with cell parameters a = 11.990(2) Å, b = 16.425(4) Å, c = 8.543(1) Å, and Z = 2. Eu8(Sn4Se14)(Se3)2 is a three dimensional structure with EuII cations linked together with an unusual (Sn4Se14)12– anionic unit and (Se3)2– chains. UV-VIS-NIR band-gap analysis shows that these black metallic crystals are likely semiconductors with an optical band-gap of 1.07 eV.