Ion-Exchange Formation of Magnetic Iron-Containing Glass with a Porous Structure

• Published in: Glass physics and chemistry Vol. 46; no. 4; pp. 305 - 311
• Main Authors: Tyurnina, Z. G., Tyurnina, N. G., Sviridov, S. I., Vlasenko, N. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2020; Springer Nature B.V
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coercivity; Composites; Composition; Coordination; Ferric ions; Ferroelectricity; Ferrous ions; Glass; Ion exchange; Iron oxides; Lithium; Magnetic saturation; Materials Science; Mossbauer spectroscopy; Natural Materials; Physical Chemistry; Pore size distribution; Porosity; Porous media; Room temperature; porous structure; magnetoelectric composites; silicate magnetic glass; ion exchange
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1134/S1087659620040124

The ion-exchange interaction of potassium iron-silicate glass with lithium nitrate melt is studied. It is established that a magnetic matrix with polymodal pore size distribution in the range of 1 nm to 10 μm is formed. No diffusion kinetics are detected in the interaction of glass with the salt melts. It is determined that the thermal history of the glass affects the composition of the phases crystallizing in it, as well as the Fe 2+ -to-Fe 3+ ratio and their coordination. According to the Mössbauer spectroscopy data in the annealed glass, Fe 3+ and Fe 2+ are tetrahedrally coordinated, while Fe 3+ and Fe 2+ are present in the octahedral coordination and Fe 3 O 4 in the quenched glass. It is determined that the initial glass 20K 2 O · 12.5FeO · 12.5Fe 2 O 3 · 55SiO 2 , mol %, is paramagnetic. The porous matrix of the glass (20Li 2 O · 12.5FeO · 12.5Fe 2 O 3 · 55SiO 2 , mol %) obtained as a result of the ion-exchange treatment of the glass in the LiNO 3 melt is characterized by the specific saturation magnetization of 1.8 G cm 3 g –1 and the coercive force of ≈ 80 Oe at room temperature. A composition material based on the magnetic glass matrix and ferroelectric in the pore space of the glass is produced.