CHARGE STATES AND ELECTRIC SURFACE RELIEF IN HEAVY METAL AZIDES

10.25712/ASTU.1811-1416.2022.02.001

Abstract

In the work using the methods of selective crystallization (decoration) and optical microspectrotomery, the observation of the Keldysh-Franz effect in filamentous crystals of heavy metal azides (b-PbN₆, AgN₃), the topography of the distribution of charge conditions, strong field domains (CHIP) was investigated, and the possible mechanisms of their formation were discussed. The use of decorating techniques at different levels of resolution detected using optical and electron microscopy made it possible to visualize an electrically active information structure in lead and silver azides, in which the processes occurring under the energy effects of radiation, electric field and temperature are localized. Paintings of decoration in the ATM NC made it possible for the first time to visualize complex elements of the electrical micro- and macro-relief and to establish a connection between the electric relief and the elastic voltage fields at dislocations or in the region of sliding bands. The existence of a diffusion-drift mechanism for the formation of chipboard associated with the separation of charged point defects (vacancies, internode atoms) in fields of elastic stresses created by structural defects (dislocations, sliding bands or embryos of a new phase) has been substantiated and proved. Based on the diffusion-drift mechanism of formation of the blast furnace electrical structure in NК b-PbN₆ around dislocations and sliding bands), the concentration of Pb⁺ or Pb²⁺ ions in the region of the spatial charge of the marginal dislocation and the magnitude of the electric field strength     E»10⁶ V/m in chipboard. The volumetric concentration of charged particles from the Debye-Hückel theory is estimated using the formula  in which L_D is the Debaev shielding length (determined experimentally), are estimated, gives a value of approximately 10²² m^-3, which corresponds to a surface charge density of     10¹⁴ m^-2 observed in the decoration paintings. The presence of chipboard confirms the ferroelectric nature of lead and silver azides.