VOL 99, No. 2 (2026)

Glasses in the TeO2–ZnO system doped with Er3+, Yb3+, Nd3+ were studied. The influence of the synthesis atmosphere on the properties was determined. The photoluminescence intensity, absorption, refractive index, and impurity purity of the glasses were experimentally determined. The stability of the spectral-luminescent properties to the tropical climate conditions of Southeast Asia was studied.

Some ceramic materials formed by sintering layered green bodies formed the compacted powders of the basic potassium polytitanate and this one modified with Mn compound are produced and investigated. Using impedance spectroscopy, the electrical properties of the resulting multilayer ceramic materials are studied in the range up to 1 MHz. It is recognized that the frequency dependence of the electrical properties of capacitor structures formed by multiple layers of varied highly polarizable dielectrics differs significantly from those obtained with monolayer dielectrics. Possible applications of multilayer ceramic structures with high permittivity as dielectrics and electrochemically active materials are analyzed.

The work is devoted to the production of iron oxide from industrial waste for its further use in the production of ceramics, catalysts and sorbents. It is proposed to use iron-containing waste from the Zavolzhsky Chemical Plant of the Ivanovo region as a starting material. The raw materials were subjected to heat treatment at temperatures of 300, 500 and 1000 ?. The possibility of removing some of the impurities by calcination of the feedstock is shown. The obtained samples were cleaned of residual impurities with various acids. Fe2O3 and Fe3O4 was obtained by precipitation from solution. The phase composition and textural characteristics of iron (III) oxide samples obtained by X-ray phase analysis, scanning electron microscopy, energy dispersion analysis, and low-temperature nitrogen adsorption/desorption are shown. The work experimentally confirmed the possibility of obtaining iron oxide from iron-containing waste in order to use it as an intermediate for the production of catalysts, sorbents and ceramics.

This study presents aspects of developing a technology for producing granulated mineral fertilizer based on phosphate foam glass. It has been established that phosphate foam glasses, with their slow solubility and ability to improve soil physical properties, are promising fertilizers for agricultural crops. A raw material mixture for melting phosphate glass was developed, comprising monopotassium phosphate, apatite concentrate from the Khibiny deposit, and orthophosphoric acid. The phosphate glass was melted at 900 °C, yielding an amorphous glassy product with a P2O5 content of 59.88 %. Based on the resulting product, phosphate foam glass samples with varying amounts of a gas-generating additive (dolomite flour) were synthesized. The optimal dolomite flour content was found to be 6 %. Phosphate foam glass granules with the optimal dolomite flour content were synthesized using a tubular rotary kiln. As a result of the synthesis, granules with a bulk density of 222 kg/m3 were obtained.

The article presents the results of studies of heat-resistant insulating ceramics, as well as a mechanism of cordierite phase formation during single firing of compositions containing polymineral clay raw materials, technical alumina and talc; phase transformations during heat treatment of experimental compositions; the effect of firing temperatures on phase formation of ceramics. The research results are of theoretical and practical interest for synthesizing heat-resistant materials, expand the understanding of the processes occurring in multicomponent systems, and allow to better understand the sequence for crystalline phases formation, creating prerequisites for structurally controlled synthesis of ceramics with a given set of technical and operational characteristics.

In this paper the experience of using regular and specially developed resistive pastes for resistors compatible with LTCC substrates is reviewed. Characteristics of surface, buried, and 3D resistors manufactured using DuPont, Ferro, Shoei, and ESL pastes on ceramics from various manufacturers are examined. Results of a study of the resistors' microstructure, phase and elemental composition, sheet resistance, tolerance, hot (HTCR) and cold (CTCR) temperature coefficient of resistance, frequency behaviour, noise indices, gauge factors, as well as their performance after thermal aging, laser trimming, and high-voltage pulse loads are presented. The influence of process conditions, resistor dimensions and the physicochemical interactions of the materials on these characteristics is assessed.