Demchenko P. Phase equilibria and crystal structure of the compounds in the {Nd, Gd}-Zn-{Si, Ge, Sn, Pb} systems and some related systems

The object is interaction of the components in {Nd, Gd}-Zn-{Si, Ge, Sn, Pb}, Nd-Zn-Sb, Nd-Cd-Si systems. The aim is to characterize the interaction of the components in {Nd, Gd}-Zn-{Si, Ge, Sn, Pb} Nd-Zn-Sb, Nd-Cd-Si ternary systems, comparative analysis. Methods and equipment: pressing and hot-sintering (press П-10, muffle furnaces of resistance (СНОЛ, МП-2У); annealing for homogenization (СНОЛ, МП-2У); electric arc-melting (electric arc-melting furnace); X-ray phase and structural analyses (X-ray cameras: РКД-57.3, РКВ-86, РГНС-2, automatic diffractometers: ДРОН-2.0, ДРОН-3М, HZG-4a, Omni Powder Diffractometer, Philips PW 1100); local X-ray spectral analysis (МИМ-7, CAMEBAX-SX50); differential thermal analysis (ВДТА-1069). Results and newness: the isothermal sections of the phase diagrams of the {Nd, Gd}-Zn-{Si, Ge, Sn, Pb} and Nd-Zn-Sb (35-100 at. % Sb) systems at 600 °C were constructed for the first time. The existence of 15 new ternary compounds was established; for 12 of them the crystal structure was determined. The new compound Nd(Cd,Si)2 was found in the Nd-Cd-Si system; its crystal structure was determined by single-crystal method and its belonging to the new structure type was established. The full structural investigation for the binary compounds NdGe1.66 and GdSi2-x was carried out for the first time. The crystal-chemistry and comparative analyses of the interaction of the components in investigated and related systems was carried out. The fields are inorganic chemistry, crystal chemistry, science of materials.