Zelinska M. Synthesis, crystal structure and properties of the ternary pnictides in the systems Er-{Ni, Pd}-{P, As, Sb} and the related with them

The isothermal section of phase diagram Er-{Ni, Pd}-{P, As} systems at 800 °C and Er-Pd-Sb system at 700 °C have been constructed based on the X-ray phase, crystal structure and EDS methods for the first time. Diagram of the phase equlibria of Er-Ni-Sb system has been refined in the region 0.50-1.0 mol. part. Er at 800 °C. LTM of Er5Sb3 was synthesized for the first time and its crystal structure has refined by full profile Rietveld's method SG Р63/mmc, ST Mn5Si3. The existence of the HTM Er5Sb3 (?-Yb5Sb3 type) has been confirmed. The transition temperature (~1190 °C) was determined by the differential thermal analysis. 20 new ternary pnictides have been synthesized for the first time. Crystal structure of 7 new ternary compounds have been investigated completely (5 of them belong to the own structure types): Er6Ni20P13, Er12Ni30P21, Er0.76Pd7.24P, Er0.94Pd1.91Sb, Er3Pd8Sb4; new ternary arsenide Er13Ni25As19 crystallizes in ST Tm13Ni25As19, and ternary antimonide Er5NixSb3-x (x = 0,48) belongs to ?-Yb5Sb3 type. The comparative analysis of interaction of the components and the crystal structures of ternary compounds in Ln-{Ni, Pd}-{P, As, Sb} systems (Ln - rare-earth metal of yttrium group) was perfomed. Electrical properties for compound Er3Pd8Sb4 and magnetic properties for the ternary pnictides Er12Ni30P21, Er3Pd20P6, Er5Pd2Sb, ErPdSb and Ln3Pd8Sb4 (Ln = Gd, Tb, Ho, Er) have been investigated. All of them are paramagnetics and their susceptibilities follow the Curie-Weiss law.