Mössbauer spectroscopy, XRPD, and SEM study of iron‐containing Na₂O‐B₂O₃‐SiO₂ glasses

Abstract

Iron species are the most common impurities in glasses, therefore their effect on structure and properties of various glasses has long been of great scientific interest. Iron in glass is usually present in its Fe 3+ and/or Fe 2+ states as a result of the equilibrium established in the melt during synthesis. 1 Both of these types of iron ions can occupy sites with different oxygen coordination, which leads to different structural roles of iron ions in the glass network (network former and modifier), hence should affect the structure, crystallization and phase separation processes, which by-turn should influence the physical and chemical properties of the resulting glasses. The effect iron has on properties and structure also depends upon the base glass composition. The more complex the system is, the more ambiguous the iron's influence is. For example, borosilicate (BS) glasses have two glass-formers, hence combine their unique properties. One of the most studied BS systems is the sodium borosilicate (NBS) system. NBS glasses are approved in USA, France, UK, and other

Novel Inorganic Membranes Based on Magnetite-Containing Silica Porous Glasses for Ultrafiltration: Structure and Sorption Properties

“…However, impregnating PGs with iron oxides [ 25 ] is not the only way to obtain an inorganic membrane with magnetic properties. The introduction of Fe 2 O 3 into the NBS glass batch containing 70 mol% SiO 2 before melting was established to cause magnetite crystallization, which has ferrimagnetic properties [ 41 , 42 , 43 , 44 , 45 ]. Magnetite-containing PGs were used as a host matrix for multiferroic composite materials obtained by impregnating the pore space with ferroelectric phases [ 46 , 47 , 48 ].…”