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...

Full description

Saved in:

Bibliographic Details
Published in:	Journal of solid state chemistry Vol. 291; p. 121627
Main Authors:	Mikhaylovskaya, Zoya A., Abrahams, Isaac, Petrova, Sofia A., Buyanova, ElenaS, Tarakina, Nadezda V., Piankova, Diana V., Morozova, Maria V.
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 01-11-2020
Subjects:	Catalytic properties Neutron diffraction Oxides Transmission electron microscopy (TEM) X-ray diffraction X-ray diffraction Oxides Catalytic properties Neutron diffraction Transmission electron microscopy (TEM)
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	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