Formation of New Glass-Ceramic Materials with Controllable Dielectric and Magnetic Properties

Abstract

Materials with strong susceptibility with respect to the electromagnetic field, namely, ferroelectric (FE) and ferromagnetic (FM) materials are of great interest for modern electronics. On the basis of ferroelectrics, devices such as varicades, delay lines, phase shifters, etc. are being actively developed. Ferromagnets (primarily ferrites) serve as the basis for directional couplers, circulators, valves, filters, phased antenna arrays, etc. Today, the most common method of creating functional composites, combining dielectric and magnetic properties, is the introduction of classical ferroelectrics, such as triglycine sulfate, Siegnette salt (KNaC4H4O6∙4H2O), sodium nitrite, etc. in iron-containing matrices. The relevance of this approach is due to the fact that when a ferroelectric is introduced into the FM matrix, it becomes possible to create composite multiferroic materials with two types of ordering (electric and magnetic). In this paper, we study the possibilities of creating glass-ceramic multiferroic materials based on Siegnette salt and barium titanate, introduced in the pore space of ferromagnetic glass, formed by ion exchange between alkaline glass cations and salt melt. For obtaining porous glass-ceramic materials by the method of ion exchange, potassium iron-containing silicate glasses are used in the work. 15K2O·20Fe2O3·55SiO2, mol. % (KFeSi).

Crystallization Kinetics and Structure Refinement of CaTiO3 Glass-Ceramics Produced by Melt-Quenching Technique

“…In the last decades there has been a considerable increase of demand for glass-ceramic materials aimed at electronic applications, with an emphasis on the development of perovskite glass-ceramics [11][12][13][14] . These are produced to obtain materials that provide both high dielectric constant or specific opto-electronic properties, and characteristics of most glassceramics, such as high mechanical resistance, impermeability and transparency.…”