Photoelectrochemical properties of titanates with the hollandite structure

Haart, L.G.J. de; Meima, G.R.; Blasse, G.

doi:10.1016/0025-5408(83)90082-x

Cited by 10 publications

(13 citation statements)

References 17 publications

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“…Note that a slight disorder between Mg 2+ and Ti 4+ in MgTiO 3 results in titanate centres, which will be responsible for the tail in the reflection spectrum of MgTiO 3. The same phenomenon was observed for the titanate K 1 8Mg0 9Ti7 1016 with the hollandite structure (16). Luminescence measurements on the same MgTiO 3 samples showed emission from these defect titanate centres (17).…”

Section: Discussionsupporting

confidence: 53%

“…For KI.8Mg0.9Ti7.1016 photocurrents were observed for excitation in the intrinsic titanate centres as well as for excitation in the defect titanate centres. In the hollandite structure both titanate centres are on the same sublattice (16). In the case of MgTi03, however, the defect titanate centre is within the Mg sublattice in the ilmenite structure.…”

Section: Discussionmentioning

confidence: 98%

“…This is of the same magnitude as in K 1 8Cr0 3All 5Ti 6 2016 (ref. 16). Because of this large energy difference between'the Cr 3+ ievels and the top of the oxygen valence band, the Cr 3+ ions will act as efficient hole traps.…”

Section: Discussionmentioning

confidence: 99%

“…This is well in line with the photocurrent-action spectrum observed for KI.8Cr0.3AII.5Ti6.2OI6 (ref. 16). …”

Section: Discussionmentioning

confidence: 99%

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Photoelectrochemical properties of MgTiO3 and other titanates with the ilmenite structure

Haart

Vries

Blasse

1984

Materials Research Bulletin

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

“…This is well in line with the photocurrent-action spectrum observed for KI.8Cr0.3AII.5Ti6.2OI6 (ref. 16). …”

Section: Discussionmentioning

confidence: 99%

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Photoelectrochemical properties of MgTiO3 and other titanates with the ilmenite structure

Haart

Vries

Blasse

1984

Materials Research Bulletin

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“…The hollandite structure consists of a framework of edge-and cornersharing octahedra forming tunnels of a square cross section along the c-axis. The alkali or alkaline earth ions are situated in these tunnels [2]. Our group has recently found that a hollandite compound K 2 Ga 2 Sn 6 O 16 (KGSO) has photocatalytic activity for oxidative decompositions of organic chloride compounds [3,4].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence properties of a hollandite compound K₂Ga₂Sn₆O₁₆

Nakajima

Mori

Awatsu³

et al. 2003

Science and Technology of Advanced Materials

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A hollandite compound K 2 Ga 2 Sn 6 O 16 (KGSO) has photocatalytic activity, although little is known about the optical properties of the compound. To design a higher quality photocatalyst, studies on its optical properties are required. In this study, a KGSO powder and a SnO 2 (rutile structure) powder were prepared by the sol-gel method. Photoluminescence (PL) and PL excitation spectra of the two powders were measured. To our knowledge, this is the first report of PL from a hollandite compound. It was found that the band gap energy of the KGSO powder is 3.6 eV, the value of which is identical with that of the band gap energy of SnO 2 . This was confirmed by the result of the photoacoustic spectrum of the KGSO. The shapes of the PL excitation spectra of the two powders agreed. Moreover, the PL spectra of the two powders have one broad band around 600 nm. From these results, one can conclude that the mechanism of PL of KGSO is the same as that of SnO 2 . In air with ethanol, however, the time-course of the KGSO powder was different from that of the SnO 2 powder. By adding ethanol vapor in air, the PL intensity of the SnO 2 powder increased, whereas the PL intensity of the KGSO powder remained unchanged. By comparing the PL time-courses of the two powders with those of a commercial rutile TiO 2 powder, it was concluded that the photodesorption of O 2 in air with ethanol occurs on the SnO 2 powder, not on the KGSO powder. This was supported by the results of the inorganic carbon concentrations on the two powders. These results indicate that the behavior of O 2 on the KGSO surface during a photocatalytic oxidation is different from that on the SnO 2 surface during the oxidation. q

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Effect of chromium doping on the electrical and catalytic properties of powder titania under UV and visible illumination

Herrmann

Disdier

Pichat

1984

Chemical Physics Letters

257

130

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Photoelectrochemical properties of titanates with the hollandite structure

Cited by 10 publications

References 17 publications

Photoelectrochemical properties of MgTiO3 and other titanates with the ilmenite structure

Photoelectrochemical properties of MgTiO3 and other titanates with the ilmenite structure

Photoluminescence properties of a hollandite compound K₂Ga₂Sn₆O₁₆

Effect of chromium doping on the electrical and catalytic properties of powder titania under UV and visible illumination

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Photoelectrochemical properties of titanates with the hollandite structure

Cited by 10 publications

References 17 publications

Photoelectrochemical properties of MgTiO3 and other titanates with the ilmenite structure

Photoelectrochemical properties of MgTiO3 and other titanates with the ilmenite structure

Photoluminescence properties of a hollandite compound K2Ga2Sn6O16

Effect of chromium doping on the electrical and catalytic properties of powder titania under UV and visible illumination

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Photoluminescence properties of a hollandite compound K₂Ga₂Sn₆O₁₆