Sr1/2Ce5/14â¡1/7WO4: a new modulated ternary scheelite compound.
Acta Crystallogr B Struct Sci Cryst Eng Mater
; 73(Pt 3): 466-473, 2017 Jun 01.
Article
in En
| MEDLINE
| ID: mdl-28572556
ABSTRACT
For the first time, a ternary tetragonal scheelite structure tungstate with strontium and cerium cations, (Sr,Ce)WO4, was synthesized. As much as 35% Ce could be inserted into the structure, leaving 1\over 7 of the (Sr,Ce) cation sites vacant. Partial ordering of Sr and Ce, with atomic displacements, were shown by high-resolution electron microscopy. Two-dimensional incommensurate modulations occur in this material, in small domains 20â
nm in size. The band gap of this compound is significantly lower than the band gap of SrWO4 and this was related to the distortions of WO4 and (Sr,Ce)O8 polyhedra. The band gap value of 3.2â
eV makes Sr1/2Ce5/14â¡1/7WO4 a promising candidate for violet luminescence.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Acta Crystallogr B Struct Sci Cryst Eng Mater
Year:
2017
Type:
Article
Affiliation country:
France