Published 2003 | Version v1
Journal article Metadata-only

Photophysical and photocatalytic properties of new photocatalysts CaIn0.5M0.5O3 (M=Nb,Ta)

Creators

  • 1. Ecomaterials Center, National Inst. for Materials Science (NIMS), Ibaraki (Japan)
  • 2. Photoreaction Control Research Center (PCRC), National Inst. of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan)

Description

New photocatalysts CaIn0.5M0.5O3 (M=Nb,Ta) with ABO3-type perovskite structure were synthesized and characterized by structural analysis, diffuse reflectance spectra and photocatalytic activity measurement under UV and visible light irradiation, respectively. From the photo-absorption behavior it is suggested that the conduction bands of the CaIn0.5Nb0.5O3 and CaIn0.5Ta0.5O3 photocatalysts are composed of In 5s-level and Nb 4d-level(or Ta 5d-level), and the valence bands are composed of O 2p level. For CaIn0.5Nb0.5O3 the band gap corresponding to O 2p → Nb 4d transition was determined as 4.2 eV, and for CaIn0.5Ta0.5O3 that corresponding to O 2p → Ta 5d transition was determined as 4.9 eV, respectively. Both compounds show an obvious photocatalytic activity under visible light irradiation (λ > 420 nm). (orig.)

Additional details

Publishing Information

Journal Title
Materials Science Forum
Journal Volume
423-425
Journal Page Range
p. 479-484
ISSN
0255-5476
CODEN
MSFOEP

Conference

Title
7. international symposium on functionally graded materials
Acronym
FGM 2002
Dates
15-18 Oct 2002
Place
Beijing (China)

INIS

Country of Publication
Switzerland
Country of Input or Organization
Switzerland
INIS RN
34072882
Subject category
S36: MATERIALS SCIENCE; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
ABSORPTION SPECTRA; CALCIUM OXIDES; CATALYSIS; CUBIC LATTICES; E1-TRANSITIONS; ELECTRONIC STRUCTURE; ENERGY GAP; EXPERIMENTAL DATA; INDIUM OXIDES; NIOBIUM OXIDES; PHOTOLYSIS; SPECTRAL REFLECTANCE; TANTALUM OXIDES; WATER; X-RAY DIFFRACTION
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DATA; DECOMPOSITION; DIFFRACTION; ENERGY-LEVEL TRANSITIONS; HYDROGEN COMPOUNDS; INDIUM COMPOUNDS; INFORMATION; MULTIPOLE TRANSITIONS; NIOBIUM COMPOUNDS; NUMERICAL DATA; OPTICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PHYSICAL PROPERTIES; REFRACTORY METAL COMPOUNDS; SCATTERING; SPECTRA; TANTALUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS