| Autor: |
Damascena Dos Passos RH; Université de Toulon, CNRS, IM2NP, BP 20132, La Garde CEDEX, F- 83957, France., Arab M; Université de Toulon, CNRS, IM2NP, BP 20132, La Garde CEDEX, F- 83957, France., Pereira de Souza C; Universidade do Rio Grande de Norte, DEQ/PPGEQ-LMNRC, Campus Universitario, Lagoa Nova 59072-970 Natal, Brazil., Leroux C; Université de Toulon, CNRS, IM2NP, BP 20132, La Garde CEDEX, F- 83957, France. |
| Jazyk: |
angličtina |
| Zdroj: |
Acta crystallographica Section B, Structural science, crystal engineering and materials [Acta Crystallogr B Struct Sci Cryst Eng Mater] 2017 Jun 01; Vol. 73 (Pt 3), pp. 466-473. Date of Electronic Publication: 2017 Jun 01. |
| DOI: |
10.1107/S2052520617002827 |
| Abstrakt: |
For the first time, a ternary tetragonal scheelite structure tungstate with strontium and cerium cations, (Sr,Ce)WO 4 , 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 20 nm in size. The band gap of this compound is significantly lower than the band gap of SrWO 4 and this was related to the distortions of WO 4 and (Sr,Ce)O 8 polyhedra. The band gap value of 3.2 eV makes Sr 1/2 Ce 5/14 □ 1/7 WO 4 a promising candidate for violet luminescence. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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