Increased Synthetic Control-Gaining Access to Predicted Mg2Si5N8 and beta-Ca2Si5N8

Bielec, Philipp und Schnick, Wolfgang (2017): Increased Synthetic Control-Gaining Access to Predicted Mg2Si5N8 and beta-Ca2Si5N8. In: Angewandte Chemie-international Edition, Bd. 56, Nr. 17: S. 4810-4813

Abstract

Nitridosilicates represent an intriguing class of materials and are typically made up of highly condensed tetrahedral network structures. Alkaline-earth nitridosilicates emerged as unique host materials for Eu2+ doped luminophores which found broad application in phosphor-converted (pc)-LEDs. In contrast to common strategies of preparing nitridosilicates by bottom-up syntheses, we have now succeeded to post-synthetically design nitridosilicates by ion exchange in metal halide melts. We describe the syntheses of hitherto unknown but predicted alkaline-earth nitridosilicates, Mg2Si5N8 and beta-Ca2Si5N8. Both compounds were obtained by ion exchange starting from pre-synthesized nitridosilicates. In situ investigations of the ion-exchange process show that the Si-N network topology remains preserved. Therefore the reaction offers a significant increase of synthetic control with respect to classical bottom-up syntheses.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 1433-7851
• Sprache: Englisch