L. O. Romanko, O. O. Bochechka, O. I. Chernienko, O. V. Kush
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Dielectric Properties of Synthetic Diamond Polycrystals
The temperature and frequency dependences of the dielectric properties, electrical conductivity, and complex impedance of polycrystalline samples sintered from synthetic diamond powder under a pressure of 8 GPa with different temperatures are studied. The sample obtained at a higher temperature has a higher electrical conductivity which arises from conduction along intergrain boundaries, a higher value of dielectric constant, and a stronger dispersion due to the distributed capacitance that occurs during the formation of charge carrier depleted layers at the interface of media with different conductivity. The analysis of complex impedance by the method of equivalent circuits showed that intergrain boundaries exert a dominant influence on these polycrystalline samples at room temperature.
期刊介绍：
Journal of Superhard Materials presents up-to-date results of basic and applied research on production, properties, and applications of superhard materials and related tools. It publishes the results of fundamental research on physicochemical processes of forming and growth of single-crystal, polycrystalline, and dispersed materials, diamond and diamond-like films; developments of methods for spontaneous and controlled synthesis of superhard materials and methods for static, explosive and epitaxial synthesis. The focus of the journal is large single crystals of synthetic diamonds; elite grinding powders and micron powders of synthetic diamonds and cubic boron nitride; polycrystalline and composite superhard materials based on diamond and cubic boron nitride; diamond and carbide tools for highly efficient metal-working, boring, stone-working, coal mining and geological exploration; articles of ceramic; polishing pastes for high-precision optics; precision lathes for diamond turning; technologies of precise machining of metals, glass, and ceramics. The journal covers all fundamental and technological aspects of synthesis, characterization, properties, devices and applications of these materials. The journal welcomes manuscripts from all countries in the English language.
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