Ammonothermal Synthesis and Solid-State NMR Study of the Imidonitridosilicate RbSiN(NH).

The imidonitridosilicate RbSiN(NH), being only the second representative of this compound class, was synthesized ammonothermally at 870 K and 230 MPa. Its crystal structure was solved from single-crystal X-ray diffraction data. The imidonitridosilicate crystallizes isotypically with the respective potassium compound in space group P432 with the lattice parameter a=10.

Reduction of Germanium Oxides-The Mixed-Valence Germanates GeO ( = Na, K).

We report on the synthesis of two-layered alkali germanates, NaGeO and KGeO. Both compounds were synthesized by using the ammonothermal method at 823 K and 100 MPa. Under these conditions, germanium is partially reduced from the +IV state to +II, forming mixed-valence compounds with the rarely observed [GeO] unit.

Solid Solutions of Grimm-Sommerfeld Analogous Nitride Semiconductors II-IV-N (II=Mg, Mn, Zn; IV=Si, Ge): Ammonothermal Synthesis and DFT Calculations.

Grimm-Sommerfeld analogous II-IV-N nitrides such as ZnSiN , ZnGeN , and MgGeN are promising semiconductor materials for substitution of commonly used (Al,Ga,In)N. Herein, the ammonothermal synthesis of solid solutions of II-IV-N compounds (II=Mg, Mn, Zn; IV=Si, Ge) having the general formula (II II )-IV-N with x≈0.5 and ab initio DFT calculations of their electronic and optical properties are presented.