Drozdova A. Concentration phase transitions in polycrystalline bismuth-antimony solid solutions

Object: the phenomena accompanying concentration phase transitions of percolating type and transitions in gapless state in solid solutions. The purpose: revealing and research of features of concentration phase transitions in polycrystalline solid solutions Bi-Sb by studying of dependences of crystal structure, mechanical, acoustic, electrophysical, galvanomagnetic and thermoelectric properties from structure of a solid solution. Methods: electron microprobe analysis, X-ray photoelectron spectroscopy, the x-ray fluorescent analysis and X-ray diffractometry. Results: for the first time in solid solutions Bi-Sb on dependences of properties on structure in the range of concentration 2.5 - 3.5at.% Sb abnormal growth of electroconductivity, magnetoresistance, mobility of a charge carriers, factor of absorption of ultrasound and parameter of a crystal lattice, reduction of Zeeback factor size, width of diffraction lines, longitudinal speed of ultrasound and a critical magnetic field which divides areas of weak and strong magnetic fields, change of character of dependence of microhardness from structure and from loading size on indenter was observed. The revealed concentration anomalies of properties are considered, as the display of the critical phenomena accompanying electronic phase transition in a gapless state. It is come out assumptions, that transition in a gapless state is accompanied by processes of impurity antimony atoms. Field of application: physics of a solid state, the physics of phase transitions