Structural, Photocatalytic and Electroconductive Properties of Bismuth-Substituted CaMoO4
| Autor: | Mikhaylovskaya, Z. A., Abrahams, I., Petrova, S. A., Buyanova, E., Tarakina, N. V., Piankova, D. V., Morozova, M. V. |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
CELL PARAMETER
X-RAY DIFFRACTION TRANSMISSION ELECTRON MICROSCOPY (TEM) TUNGSTATE MINERALS NEUTRON DIFFRACTION PHOTOCATALYTIC ACTIVITY VANADIUM METALLOGRAPHY CATALYST ACTIVITY BISMUTH DEFECTS HIGH RESOLUTION TRANSMISSION ELECTRON MICROSCOPY URANIUM METALLOGRAPHY PHOTO-CATALYTIC PHOTOCATALYTIC PROPERTY RHODAMINE B ELECTRO-CONDUCTIVE PROPERTIES CATALYTIC PROPERTIES OXIDES BISMUTH METALLOGRAPHY POWDER X-RAYS SCHEELITE STRUCTURE WATER SOLUTIONS CATION VACANCIES |
| Zdroj: | J. Solid State Chem. Journal of Solid State Chemistry |
| Popis: | 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. © 2020 Elsevier Inc. The study was done with a support of RSF, projects № 20-73-10048. The travel grant for neutron diffraction work was given by Act 211 Government of the Russian Federation, contract № 02.A03.21.0006. The authors are grateful to the Science and Technology Facilities Council STFC for neutron beam time at the ISIS facility, Rutherford Appleton Laboratory, award No. RB1910306. Dr Ron Smith at ISIS is thanked for his help in neutron data collection. |
| Databáze: | OpenAIRE |
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