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Sr 1/2 Ce 5/14 □ 1/7 WO 4 : a new modulated ternary scheelite compound
Author(s) -
Damascena dos Passos Rafael Hernandez,
Arab Madjid,
Pereira de Souza Carlson,
Leroux Christine
Publication year - 2017
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520617002827
Subject(s) - scheelite , tetragonal crystal system , tungstate , cerium , ternary operation , luminescence , band gap , materials science , crystallography , strontium , ternary compound , crystal structure , analytical chemistry (journal) , chemistry , inorganic chemistry , tungsten , optoelectronics , organic chemistry , chromatography , computer science , programming language , metallurgy
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 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.