Group (III) Nitrides M[Mg2Al2N4] (M = Ca, Sr, Ba, Eu) and Ba[Mg2Ga2N4]—Structural Relation and Nontypical Luminescence Properties of Eu2+ Doped Samples
| Autor: | Cora Hecht, Sascha Harm, Daniela Zitnanska, Frauke Hintze, Detlef U. Wiechert, Wolfgang Schnick, Peter J. Schmidt, Philipp Pust, Volker Weiler, Andreas Locher |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Chemistry of Materials. 26:6113-6119 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm502280p |
| Popis: | The isotypic nitridomagnesoaluminates M[Mg2Al2N4] (M = Ca,Sr, Ba,Eu) as well as a novel nitridomagnesogallate Ba[Mg2Ga2N4] have been synthesized by high-temperature reactions in arc-welded tantalum ampules. The crystal structures were solved and refined using single-crystal X-ray diffraction or powder X-ray diffraction data, respectively. All compounds crystallize in the UCr4C4-structure type (space group I4/m (no. 87), Z = 2, Ca[Mg2Al2N4]: a = 8.0655(11), c = 3.2857(7) A, wR2 = 0.085 Sr[Mg2Al2N4]: a = 8.1008(11), c = 3.3269(7) A, wR2 = 0.084; Eu[Mg2Al2N4]: a = 8.1539(12), c = 3.3430(7) A, wR2 = 0.033; Ba[Mg2Al2N4]: a = 8.2602(9), c = 3.43198(19) A, wRp = 0.031; Ba[Mg2Ga2N4]: a = 8.3654(12), c = 3.4411(7) A, wR2 = 0.031) forming highly condensed anionic networks of disordered (Al/Mg)N4 and (Ga/Mg)N4 units, connected to each other by common edges and corners. The M2+ site is centered in vierer ring channels along [001] and coordinated in a cuboidal surrounding by N. Eu2+ doped samples of M[Mg2Al2N4] (M = C... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|