Group (III) Nitrides M[Mg2Al2N4] (M = Ca, Sr, Ba, Eu) and Ba[Mg2Ga2N4]—Structural Relation and Nontypical Luminescence Properties of Eu2+ Doped Samples

• DOI: 10.1021/cm502280p
• Publication Date: 2014-08-26T17:47:28Z
• Authors: Philipp Pust; Frauke Hintze; Cora Hecht; Volker Weiler; Andreas Locher; Daniela Zitnanska; Sascha Harm; Detlef Wiechert; Peter J. Schmidt; Wolfgang Schnick
• Keywords: 01 natural sciences; 0104 chemical sciences

The isotypic nitridomagnesoaluminates M[Mg2Al2N4] (M = Ca,Sr, Ba,Eu) as well a novel nitridomagnesogallate Ba[Mg2Ga2N4] have been synthesized by high-temperature reactions in arc-welded tantalum ampules. crystal structures were solved and refined using single-crystal X-ray diffraction or powder data, respectively. All compounds crystallize the UCr4C4-structure type (space group I4/m (no. 87), Z 2, Ca[Mg2Al2N4]: 8.0655(11), c 3.2857(7) Å, wR2 0.085 Sr[Mg2Al2N4]: 8.1008(11), 3.3269(7) 0.084; Eu[Mg2Al2N4]: 8.1539(12), 3.3430(7) 0.033; Ba[Mg2Al2N4]: 8.2602(9), 3.43198(19) wRp 0.031; Ba[Mg2Ga2N4]: 8.3654(12), 3.4411(7) 0.031) forming highly condensed anionic networks of disordered (Al/Mg)N4 (Ga/Mg)N4 units, connected to each other common edges corners. M2+ site is centered vierer ring channels along [001] coordinated cuboidal surrounding N. Eu2+ doped samples Ca,Sr,Ba) exhibit nontypical luminescence properties including trapped exciton emission red spectral region. These widen red-emitting materials such Ca[LiAl3N4]:Eu2+, Sr[LiAl3N4]:Eu2+, Sr[Mg3SiN4]:Eu2+. Therefore, deep discussion observed anomalous essential understand correlations between all these materials, which are fundamental design narrow band systems.