Synthetic and Structural Investigations on the System Na_1–xEu_x[Li_3‐2xSi_1‐xAl_3xO_4‐4xN_4x]

Abstract

During the investigation of a solid‐solution series between the alkali lithosilicate Na[Li3SiO4] and the hypothetical nitridolithoaluminate Eu[LiAl3N4] with the generalized sum formula Na1–xEux[Li3–2xSi1‐xAl3xO4–4xN4x], a hitherto unknown oxo‐nitride has been synthesized. The new material with the composition Na1–xEux[Li3–2xSi1‐xAl3xO4–4xN4x] (x = 0.22) crystallizes in the tetragonal space group I4/m (no. 87) with a = 7.704(2) and c = 3.1584(6) Å. To the best of our knowledge this is the first synthesis of a litho‐alumo‐oxo‐nitridosilicate containing either alkali‐, or rare‐earth metals. Upon excitation of this novel compound with near UV to blue light, a broadband amber emission with a maximum at 612 nm and a full width at half maximum of 2835 cm‐1 (≈ 105 nm) is observed. Furthermore, single‐crystals of the solid‐solution series could be synthesized on the oxygen‐rich side between 0 < x < 0.2. The thereby received phosphors crystallize in the Na[Li3SiO4]‐structure type and their emission maxima can be shifted in the spectral range from 469 nm up to 588 nm.

An Unprecedented Fully H–‐Substituted Phosphate Hydride Sr5(PO4)3H Expanding the Apatite Family

“…Replacement and combinations of different anions is known to be a very useful tool in inorganic solid‐state materials design . In recent times, especially the search for new mixed‐anionic hydrides has become an important research field.…”