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Structure Elucidation of Complex Endotaxially Intergrown Lanthanum Barium Oxonitridosilicate Oxides by Combination of Microfocused Synchrotron Radiation and Transmission Electron Microscopy |
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| Authors: | Lisa Gamperl Lukas Neudert Peter Schultz Dajana Durach Prof. Dr. Wolfgang Schnick Prof. Dr. Oliver Oeckler |
| Affiliation: | 1. Department of Chemistry, University of Munich (LMU), Butenandtstr. 5–13, 81377 Munich, Germany;2. Department of Chemistry, University of Munich (LMU), Butenandtstr. 5–13, 81377 Munich, Germany Institute for Mineralogy, Crystallography and Material Science, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, Germany;3. Institute for Mineralogy, Crystallography and Material Science, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, Germany |
| Abstract: | Single-crystalline domains in intergrown microcrystalline material of the new compounds Ba22.5+xLa55−x[Si129N240−xOx]O3:Ce3+ and Ba25.5+xLa77−x[Si170N312−xO9+x]O4:Ce3+ were identified by transmission electron microscopy (TEM). Precise diffraction data from these domains were collected with microfocused synchrotron radiation so that crystal structure elucidation of the complex disordered networks became possible. They are composed of two different interconnected slabs of which one is similar in both compounds, which explains their notorious intergrowth. The distribution of Ba and La is indicated by the analysis of bond-valence sums and by comparison with isostructural Sr28.5+xLa75−x[Si170N312−xO9+x]O4. Ce3+ doping leads to yellow luminescence. This is a showcase that highlights the discovery and accurate characterization of new compounds relevant for luminescence applications from heterogeneous microcrystalline samples by exploiting the capability of the combination of TEM and diffraction using the latest focusing techniques for synchrotron radiation. |
| Keywords: | electron microscopy high-temperature chemistry luminescence microcrystals microfocused synchrotron radiation |