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Fe2 Si5 N8 : Access to Open-Shell Transition-Metal Nitridosilicates
Philipp Bielec1, Oliver Janka2, Theresa Block2
1Department of Chemistry, University of Munich, Butenandtstrasse 5-13, 81377, Munich, Germany.
Angewandte Chemie (International Ed. in English)
|January 17, 2018
Summary
Researchers developed a new method to create transition-metal nitridosilicates, crucial for energy-saving LEDs. The first iron nitridosilicate, Fe2Si5N8, was successfully synthesized, expanding material possibilities.
Area of Science:
- Solid-state chemistry
- Materials science
- Inorganic chemistry
Background:
- Nitrido silicates doped with Eu2+ or Ce3+ are vital for energy-saving applications, particularly in converting blue light from Indium Gallium Nitride (InGaN) Light Emitting Diodes (LEDs).
- While nitridosilicate structures exhibit diversity through covalent anionic Si-N networks, their elemental composition has been limited.
- Expanding the elemental variety of nitridosilicate materials is essential for developing new functional phosphors and catalysts.
Purpose of the Study:
- To establish a general synthetic route for open-shell transition-metal nitridosilicates.
- To synthesize and characterize the first iron-containing nitridosilicate.
- To investigate the structural and chemical properties of the novel iron nitridosilicate and its precursor.
Main Methods:
- Salt metathesis reaction using a FeCl2 melt to exchange Ca2+ with Fe2+ in α-Ca2Si5N8.
- Powder X-ray diffraction (PXRD) for structural analysis.
- Energy-dispersive X-ray (EDX) spectroscopy and Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES) for elemental composition.
- Combustion analysis, Thermogravimetric/Differential Scanning Calorimetry (TG/DSC) for thermal properties.
- Mössbauer spectroscopy and magnetic susceptibility measurements for characterization of iron species.
Main Results:
- Successful synthesis of the first iron nitridosilicate, Fe2Si5N8, via salt metathesis.
- Confirmation of the anionic network structure in the precursor α-Ca2Si5N8, even at high temperatures (1073 K and 1173 K).
- Detailed characterization of Fe2Si5N8, confirming its formation and properties.
Conclusions:
- A general method for synthesizing open-shell transition-metal nitridosilicates has been demonstrated.
- The synthesis of Fe2Si5N8 represents a significant expansion of the elemental scope of nitridosilicate materials.
- The findings open avenues for exploring new nitridosilicate-based functional materials with potential applications in lighting and catalysis.
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