title: Increased Synthetic Control-Gaining Access to Predicted Mg2Si5N8and β-Ca2Si5N8.
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, Mg2Si5N8and β-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.
authors.affiliation: Department of Chemistry, University of Munich, Butenandtstrasse 5-13 (D), 81377, Munich, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Bielec
authors.affiliation: Department of Chemistry, University of Munich, Butenandtstrasse 5-13 (D), 81377, Munich, Germany.
authors.forename: Wolfgang
authors.identifier: 0000-0003-4571-8035
authors.initials: W
authors.lastname: Schnick
keywords: ion exchange; nitrides; nitridosilicates; post-synthetic modification; silicates