Three-Dimensional (3D) Microporous Iron Silicate with an Imandrite Type of Structure

Abstract

Small-pore iron silicate MS-1 (Minho-Sofia, solid number 1) with a 3D porous system, an analogue of the rare mineral imandrite, has been synthesized and characterized. This material is the lowest framework density iron silicate, one of the most siliceous (Si/Fe = 6) iron silicates, the first iron cyclosilicate achieved at hydrothermal conditions, and the only synthetic iron-based member of the lovozerite mineral group.

Indium silicate with an imandrite-type structure

“…This type of disorder has not been previously observed in MS-1 (ref. 4 ) or the mineral imandrite. 5 The vacancy created around the [SiO 4 ] vertices is compensated by [Ca(Na)O 6 ] octahedron (Ca2(Na21) position), which occupies the C site and shares common oxygen ions with the surrounding silicate units ( Fig.…”

“…Our previous efforts have led to a strategy for the synthesis of microporous metal silicates using a combination of alkaline and alkaline-earth cations as structure-directing agents. Thus, we obtained the Ba-Na microporous zirconosilicate MCV-2 (Ba 2 (Na,H 2 O) 3 Zr 2 Si 6 O 19 $3H 2 O), 3 and more recently, the Ca-Na microporous iron silicate MS-1 (Na 6.7 Ca 1.3 FeSi 6 O 18 ), 4 which is an analogue of the rare mineral imandrite (Na 6 Ca 1.5 -FeSi 6 O 18 ) 5 and is classied as a zeolite-like cyclosilicate of the lovozerite mineral group. 6 In this paper, we extend our interest to indium silicates.…”

Cobalt silicate: critical synthetic conditions affect its electrochemical properties for energy storage and conversion

“…They have mature applications in various fields, such as selective catalysis, molecular sieves, gas adsorption and separation, and so on. [1][2][3][4][5][6][7] In recent years, layered TMSs have received great attention because they have tremendously promising applications for energy storage and conversion due to their favorable mass transfer structure to achieve a high energy density. [8][9][10][11][12][13][14][15][16] For example, Zhang and his coworkers synthesized various threedimensional manganese/nickel/cobalt silicates using the biomass method in combination with the alkali etching process, and the synthesized silicates exhibited excellent electrochemical properties applied to high-performance hybrid supercapacitors.…”