Abstract
Abstract Three new europium pnictides Eu2ZnP2, Eu2Zn2P3 and Eu2Cd2As3 have been synthesized and their structures were determined by single-crystal X-ray diffraction. Eu2ZnP2 is isotypic with Yb2CdSb2 (Cmc21 (No. 36); cell parameters a=4.1777(7) A, b=15.925(3) A, c=7.3008(12) A), while the latter two compounds crystallize with the Ba2Cd2Sb3 structure type (C2/m (No. 12); cell parameters a=15.653(5)/16.402(1) A, b=4.127(1)/4.445(4) A, c=11.552(4)/12.311(1) A and β=126.647(4)/126.515(7)° for Eu2Zn2P3 and Eu2Cd2As3, respectively). Magnetic susceptibility measurements in the interval 5–300 K confirm paramagnetic behavior and effective magnetic moments characteristic of Eu2+ ([Xe] 4f7) ground states. Temperature-dependent electrical conductivity measurements also prove that Eu2Cd2As3 is a semiconducting compound with a narrow band gap of 0.059 eV below 100 K. According to TG/DSC analyses, Eu2Cd2As3 starts to decompose at about 950 K.
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