Increased Synthetic Control—Gaining Access to Predicted Mg2Si5N8 and β‐Ca2Si5N8. (27th March 2017)

• Record Type: Journal Article
• Authors: Bielec, Philipp; Schnick, Wolfgang
• Is Part Of: Angewandte Chemie. Volume 129:Number 17(2017)
• Page Start: 4888
• Page End: 4891
• Publication Date: 2017-03-27
• Subjects: Ionenaustausch -- Nitride -- Nitridosilicate -- Postsynthetische Modifikationen -- Silicate; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201701361
• Languages: English
• ISSNs: 0044-8249

Abstract

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 Eu 2+ 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, Mg2 Si5 N8 and β‐Ca2 Si5 N8 . 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.