Abstract
The effect of Sr2+ substitution on the morphology, crystal structure, and optical properties of double perovskite oxide Ba2−xSrxZnWO6 (x = 0.00, 0.25, 0.50, 0.75, 1.00) were investigated. Scanning electronic microscopy demonstrated that all samples have similar microstructure morphology but differ in the range of grain sizes. X-ray diffraction measurements indicated that these materials crystallize in a (Fm-3m) cubic crystal structure, and also confirmed the tolerance factor. Rietveld analysis revealed that the lattice parameter decreased from 8.11834 to 8.039361 Å when the substitution of Ba2+ with Sr2+ cations increased from zero to 100%. Fourier transform infrared (FTIR) and Raman spectroscopies displayed a symmetric stretching vibration of WO6 octahedra at 825 cm−1, and an anti-symmetric stretching mode of WO6 was observed by FTIR at 620 cm−1. A strong peak at 420 cm−1 was also observed in the Raman spectra and is due to the W–O–W bending vibration modes. UV-Vis diffuse reflectance spectroscopy was carried out for the series, and the band gap energy decreased from 3.27 eV for Ba2ZnWO6 to 3.02 and 3.06 eV for Ba1.75Sr0.25ZnWO6 and Ba1.5Sr0.5ZnWO6, respectively. The excitation and emission photoluminescence properties were investigated at room temperature.
Highlights
Many researchers are interested in double perovskite oxides that consist of transition metals [1]
In all samples, the size of the particles is large and they are aggregated in groups, which is due to the higher preparation temperature
The Ba2−x Srx ZnWO6 (x = 0.00, 0.25, 0.50, 0.75, 1.00) double perovskite series was prepared by the solid-state reaction technique
Summary
Many researchers are interested in double perovskite oxides that consist of transition metals [1].These materials represent a large part of material science research because of the diversity in their physical and chemical characteristics, and their diverse applications [1,2,3,4,5,6], such as light harvesting (LaNiMnO6 ) [2], ferroelectrics (Pb2 Mn0.6 Co0.4 WO6 ) [5], Multiferroic (Bi2 NiMnO6 , Bi2 FeCrO6 ) [6], superconductivity (Sr2 YRu0.95 Cu0.05 O6 ) [7], magneto resistance (Sr2 FeMoO6 ) [8], dielectric resonators (Ca2 AlTaO6 , SrAlTaO6 ) [9], and photo-catalysis (Cs2 BiAgCl6 ) [10].A variety of devices and methods have previously been used to find and characterize new double perovskite compounds at high temperatures. Many researchers are interested in double perovskite oxides that consist of transition metals [1] These materials represent a large part of material science research because of the diversity in their physical and chemical characteristics, and their diverse applications [1,2,3,4,5,6], such as light harvesting (LaNiMnO6 ) [2], ferroelectrics (Pb2 Mn0.6 Co0.4 WO6 ) [5], Multiferroic (Bi2 NiMnO6 , Bi2 FeCrO6 ) [6], superconductivity (Sr2 YRu0.95 Cu0.05 O6 ) [7], magneto resistance (Sr2 FeMoO6 ) [8], dielectric resonators (Ca2 AlTaO6 , SrAlTaO6 ) [9], and photo-catalysis (Cs2 BiAgCl6 ) [10]. Paiva et al [3] used the PANalytical diffractometer and Solartron
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