For the first time, using modern analytical methods studied phase and impurity composition of the cathode alloys Pt-Ba, obtained by industrial technology. The concentration of harmful impurities (C, Zn, Ba, Cu) in objects of study does not exceed the standards for these materials. Transmission electron microscopy and X-ray analysis confirmed the previously observed biphasic alloys Pt-Ba, from which one phase - intermetallic compound (Pt5Ba), second - platinum (matrix), wherein the intermetallic compound is very unevenly distributed in the matrix. It is found that in the alloys of Pt-Ba Pt grains - small (a few hundred nm) and grain Pt5Ba - large (make several microns) and more sophisticated. Inside there are grains Pt5Ba voltage. Processing methods are proposed to improve the homogeneity of the alloy.
Keywords: alloyed metal cathodes, Pt-Ba, emission properties, transmission electron microscopy, X-ray analysis, impurity composition, the coefficient of secondary electron emission
The paper discussed the mechanism of formation of polycrystalline hexagonal barium ferrite. The influence of alloying elements on the location of Fe3 hexagonal block R, on the border of hexagonal and spinel blocks (RS). It is shown that the presence of weakly diamagnetic ions or dopants in these positions provides specific properties of hexagonal ferrites and their practical use.
Keywords: hexaferrite barium, dopant, magnetic properties, the mechanism of formation, anisotropy, polycrystalline, magnetization, Mossbauer spectroscopy, the coercive force, Curie temperature