If light from a continuous spectrum source is passed through an interferometer, and the resulting horizontal interference fringes are projected onto a vertically arranged slit of a spectrograph, then each interference fringe will be spread into a spectrum ...

The identity of X-ray photographs of plastically deformed annealed and unannealed crystals indicates that elastic changes in the orientation of neighboring sections of a plastically deformed unannealed crystal play an insignificant role in the formation of tails on the photographs. The investigation of the nature of rotation led to a detailed study of tails on X-ray photographs, since the reorientation of individual sites in a deformed crystal is most reliably established by means of X-ray photographs. From a crystal whose lattice is distorted, X-ray photographs with blurred and split spots are obtained, and asterisms and bridges between bright spots appear.

Micas are an extensive group of minerals characterized by perfect {001} cleavage, i.e. the ability to easily split into very thin sheets with a flat surface parallel to the face of the third pinacoid. Muscovite and phlogopite have the most important industrial value. Micas have high electrical characteristics, incombustibility and great mechanical strength, they are also thermally and chemically stable, and are not very hygroscopic. Micas crystallize in a monoclinic system, approaching hexagonal forms. Under the influence of mechanical effects, mica deform, lose their properties and become unsuitable for industrial purposes, so, of course, the study of deformed mica is paid much attention.

Passivation of metals in the process of corrosion occurs by adsorption of oxygen and other elements and compounds (adsorption passivation) and by the formation of surface films representing chemical compounds of metals (phase passivation). Adsorption passivation can be considered as the first stage of phase passivation.