Keyword: «scanning tunneling microscopy»

To improve and develop new technologies for the extraction of fine gold, it is necessary to find out the form of the location and chemical state of gold in concentrator minerals. For the first time, complex chemical and ion-plasma etching of a sulfide matrix in an oxygen and argon medium was used to open nanoscale gold. As a result of chemical etching, loose iron chloride salts and other unstable compounds are formed on the surface of sulfides, which are partially removed by ultrasonic cleaning. Ion-plasma etching in an oxygen and argon medium removes the products of the chemical reaction and conducts a finer etching of sulfides. It is shown that noble metals with their high electrical conductivity ionization caused by irradiation with charged particles is very quickly neutralized by conduction electrons, and this process does not lead to any noticeable changes in their electrophysical properties, providing selective etching of the sulfide matrix. A study of the morphology and localization of nanozolot in sulfides by scanning tunneling, atomic force microscopy was carried out. It is established that nanoscale gold inclusions are distributed throughout the volume of the host sulfides in a native form. The deformation structures of the enclosing sulfides and their relationship with gold emissions are investigated.

Developing a wide range of methods for analyzing and diagnosing the properties of materials of various dimensions, including the submicron structure of metals and alloys, is a key challenge in modern materials science. A key area of research for these methods is increasing the resolution of equipment. One such promising method for studying material properties is probe microscopy, which allows for the analysis and observation of the surface of material samples in three-dimensional coordinates. In this study, scanning tunneling microscopy was used to examine fractures of rail steel specimens tested for impact strength.

Impact tests of rail steel samples used on railways in the extreme climatic conditions of Central Yakutia, and morphological analysis of fracture surfaces using scanning tunnel microscopy of damaged surfaces revealed features of the morphology of the microstructure of deformed sections of the rail.