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In this paper, using a scanning electron microscope (SEM) and atomic analysis, the location map of microcomposites formed on the surface of n-Si, p-Si, n-Si and p-Si samples was studied. Force microscope (AFM) research devices. The atomic fractions of inclusions of carbon, oxygen and lutetium formed on the surface of the samples were studied. Also, using the ASM device, the sizes, relief and topographic appearance of defects formed on the surface of the samples were determined. In silicon samples doped with Lu, a decrease in the size of surface defects and the formation of nano-sized structures were found, which makes it possible to obtain materials with a more perfect crystal structure. Using a ZEISS GeminiSEM 300 scanning electron microscope, the structural structure, chemical composition and images of their arrangement of n-Si, p-Si, n-Si and p-Si samples were obtained. In this case, the electron accelerating voltage was 20 kV, and the pressure in the sample chamber was (10-3 mmHg). Research results show that the structural structure of microand nanocomposites formed in silicon mainly depends on the diffusion time and cooling rate of the samples after diffusion annealing. [ABSTRACT FROM AUTHOR]

The phase relations in the La2O3-Lu2O3-Er2O3 ternary system at 1500 and 1600 °C were studied in the whole concentration range by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Oxides of La, Lu, and Er (99.99 %) were used as starting substances. The samples were prepared with a concentration step of 1-5 mol. %. The oxides were dissolved in HNO3 (1:1) followed by evaporation of the solutions and decomposition of nitrates at 800 °C for 2 hours. The samples were heat treated at 1500 °C (for 70 h), and 1600 °C (for 10 h) in air. The phase composition of the test samples studied by X-ray diffraction (XRD, DRON-3), microstructural phase and electron microprobe X-ray (Superprobe-733, JEOL, Japan, Palo Alto, CA) analyses. Solid solutions based on various polymorphic forms of original oxides and ordered LaLuO3 (LaErO3) phases were detected in the system. No new phases were found in the system. The isothermal cross-sections of the La2O3-Lu2O3-Er2O3 phase diagram at 1500 and 1600 °C are characterized by the presence of three single-phase (A-La2O3, R, C-Lu2O3 (Er2O3)) and two two-phase (C+ R, A + R) regions. The system forms continuous series of solid solutions based on the cubic modification of CLu2O3(Er2O3) and the ordered perovskite-type phase (R-phase). Solubility limits are determined and concentration dependences of periods also lattice parameters of the unit cell of phases formed in the system are constructed. The range of homogeneity of solid solutions based on the R-phase extends from 46 to 54 mol % La2O3 at 1500 C and from ~48 to 54 mol % La2O3 at 1600 C. Lutetium and erbium oxides form an continuous series of C-REE oxide solid solutions. [ABSTRACT FROM AUTHOR]

Spectral-luminescent characteristics of Eu(III) complexes with modified diethylenetriaminepentaacetic acid and silica xerogel based on it are studied. It was established that the inorganic matrix leads to elimination of nonradiative energy losses and increase in Eu(III) fluorescent signal.