Structural, photocatalytic and electroconductive properties of bismuth-substituted CaMoO4

The Ca1−3xBi2xФxMoO4 system (0.025 ​≤ ​x ​≤ ​0.30, where Ф represents cation vacancies) was synthesized and studied. The 0.025 ​= ​x ​≤ ​0.15 compositions show a tetragonal defect scheelite structure. Powder X-ray and neutron diffraction patterns for compositions with 0.15 ​< ​x ​≤ ​0.225 exhibit...

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Vydáno v:Journal of solid state chemistry Ročník 291; s. 121627
Hlavní autoři: Mikhaylovskaya, Zoya A., Abrahams, Isaac, Petrova, Sofia A., Buyanova, ElenaS, Tarakina, Nadezda V., Piankova, Diana V., Morozova, Maria V.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Inc 01.11.2020
Témata:
Catalytic properties
Neutron diffraction
Oxides
Transmission electron microscopy (TEM)
X-ray diffraction
X-ray diffraction
Oxides
Catalytic properties
Neutron diffraction
Transmission electron microscopy (TEM)
ISSN:0022-4596, 1095-726X
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Shrnutí:The Ca1−3xBi2xФxMoO4 system (0.025 ​≤ ​x ​≤ ​0.30, where Ф represents cation vacancies) was synthesized and studied. The 0.025 ​= ​x ​≤ ​0.15 compositions show a tetragonal defect scheelite structure. Powder X-ray and neutron diffraction patterns for compositions with 0.15 ​< ​x ​≤ ​0.225 exhibit a tetragonal supercell with asup ​≈ ​√5a, csup ​≈ ​c where a and c are the tetragonal scheelite cell parameters. Transmission electron microscopy shows that Ca0.4Bi0.4MoO4, crystals consist of three crystallographic domains: (1) defect scheelite; (2) tetragonal superlattice and (3) incommensurately modulated. Photocatalytic properties were studied using Rhodamine B water solutions under UV light. Catalytic activity increases with increasing Bi content. The conductivity of 0.15 ​< ​x ​≤ ​0.225 compositions is 10−7 to 10−8 ​S ​cm−1 in the range 500–650 ​°C, while compositions in the range 0.025 ​= ​x ​≤ ​0.15 show conductivity values from 10−3 to 10−8 ​S ​cm−1 from 500 to 800 ​°C. [Display omitted] •Ca1−3xBi2xФxMoO4 (0.025 ​≤ ​x ​≤ ​0.15) shows a defect scheelite structure.•Ca1−3xBi2xФxMoO4 (0.15 ​< ​x ​≤ ​0.225) exhibits a supercell with asup ​≈ ​√5a, csup ​≈ ​c.•Three types of domains in Ca0.4Bi0.4MoO4 microcrystals were found by TEM.•The photocatalytic activity of Ca1−3xBi2xФxMoO4 for RhB oxidation increases with x.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2020.121627