Nonstoichiometric Li-Pseudobrookite(ss) in the Li2O-Fe2O3-TiO2System

Grey, Ian E.; Li, C.; Ness, Timothy J.

doi:10.1006/jssc.1998.7959

Cited by 12 publications

(9 citation statements)

References 21 publications

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“…A peak at around 18°(2θ) appears which can be assigned to orthorhombic Fe 2 TiO 5 , which has a pseudobrookite structure and eventually to a monoclinic polytype Fe 2 TiO 5 . 78,79 Nevertheless, for the latter, the main line is absent from the XRD pattern. While increasing the Fe ratio to 50% seems to enable the preparation of a single phase of orthorhombic Fe 2 TiO 5 , the absence of the monoclinic variety cannot be completely ruled out.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, iron doping has shown to favor the brookite TiO 2 polymorph at the expense of the anatase. , For % Fe higher than 10, XRD patterns strongly evolve, indicating a phase transition which becomes more obvious in TiO 2 -33% Fe. A peak at around 18° (2θ) appears which can be assigned to orthorhombic Fe 2 TiO 5 , which has a pseudobrookite structure and eventually to a monoclinic polytype Fe 2 TiO 5 . , Nevertheless, for the latter, the main line is absent from the XRD pattern. While increasing the Fe ratio to 50% seems to enable the preparation of a single phase of orthorhombic Fe 2 TiO 5 , the absence of the monoclinic variety cannot be completely ruled out.…”

Section: Resultsmentioning

confidence: 99%

“…PDFs are indeed particularly well-adapted to study nanostructured materials as they provide a histogram of all the atom−atom (pair) distances within the sample independently of its crystalline state. 80 The PDF of TiO 2 -50% Fe was fitted using different structural models of Fe 2 TiO 5 (orthorhombic pseudobrookite with random Fe distribution in the metal sites 61 or ordered monoclinic structure 78 ). The fitting using solely the pseudobrookite type structure largely failed in reproducing the PDF data.…”

Section: Resultsmentioning

confidence: 99%

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How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

et al. 2016

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We discuss here for the first time how to combine iron and titanium metal ions to achieve a high photo-electrochemical activity for TiO 2 -based photo-anodes in water splitting devices. To do so, a wide range of photoelectrode materials with tailored Ti/Fe ratio and element vicinity were synthesized by using the versatility of aqueous sol-gel chemistry in combination with a microwave-assisted crystallization process. At low ferric concentrations, single phase TiO 2 anatase doped with various Fe amounts were prepared. Strikingly, at higher ferric concentrations, propose that the nature of the heterojunction impacts charge carrier recombination. The results presented herein not only answer whether iron and titanium should be combined in the same structure or into heterostructured systems, but also on the importance of the arrangement of ions in the structure to improve the performances of the photoanode.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

et al. 2016

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“…FWHM over 4000 cm −1 ); this may imply a strong local distortion of the CrO 6 site. A possible interstitial site in the tialite lattice is present along “channels” parallel to the b axis, where a strongly distorted octahedral site is envisaged with a mean M–O distance of around 2 Å 35 …”

Section: Resultsmentioning

confidence: 99%

M‐Doped Al₂TiO₅ (M=Cr, Mn, Co) Solid Solutions and their Use as Ceramic Pigments

Dondi

Lyubenova

Carda

et al. 2009

Journal of the American Ceramic Society

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New ceramic pigments based on the tialite (Al 2 TiO 5 ) structure, doped with Co (pink), Cr (green), or Mn (brown), were prepared through the pyrolysis of aerosols followed by calcination of the obtained powders at 14001C. The expected decomposition of Al 2 TiO 5 into a mixture of Al 2 O 3 and TiO 2 on refiring was inhibited by Cr-doping and also by co-doping with Mg the Mn-or Co-doped samples. Microstructure and phase evolution during pigment preparation were monitored by scanning electron microscopy and XRPD. Unit cell parameters of tialite were determined by Rietveld refinement of the X-ray diffraction patterns, revealing in all cases the formation of solid solutions where the solubility of dopants in the Al 2 TiO 5 lattice followed the trend CooMnoCr. The valence state and possible location of dopants in the tialite lattice were investigated by X-ray photoelectron spectra and diffuse reflectance spectroscopies, which suggested the presence of Cr 31 ions in a large interstitial site of the tialite lattice with a distorted octahedral geometry, and of Mn 31 and Co 21 ions in the Al 31 octahedral sites of the tialite lattice in the former case, and in both Al 31 and Ti 41 octahedral sites in the latter. Testing the ceramic glazes assessed the technological behavior of pigments, which found that the color stability was reasonably good for the Mn-doped tialite and the Crdoped pigment, although the latter suffered a small loss of green hue. The Co-doped pigment was found to be not stable in glazes, undergoing a cobalt-leaching effect. P. Davies-contributing editor

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“…Safonov et al 7 and Grey et al 8 have already reported the LiO 0.5 -CrO 1.5 and LiO 0.5 -TiO 2 pseudo-binary systems, respectively. Further, Lee 9 and Pownceby et al 10 and Somiya et al 11 between 1673 and 2038 K, respectively.…”

Section: Introductionmentioning

confidence: 95%

Effective algorithm for material exploration in ceramics with combinatorial technology

Fujimoto

Ito

Suehara

et al. 2006

Journal of the European Ceramic Society

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Nonstoichiometric Li-Pseudobrookite(ss) in the Li2O-Fe2O3-TiO2System

Cited by 12 publications

References 21 publications

How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

M‐Doped Al₂TiO₅ (M=Cr, Mn, Co) Solid Solutions and their Use as Ceramic Pigments

Effective algorithm for material exploration in ceramics with combinatorial technology

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Nonstoichiometric Li-Pseudobrookite(ss) in the Li2O-Fe2O3-TiO2System

Cited by 12 publications

References 21 publications

How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

M‐Doped Al2TiO5 (M=Cr, Mn, Co) Solid Solutions and their Use as Ceramic Pigments

Effective algorithm for material exploration in ceramics with combinatorial technology

Contact Info

Product

Resources

About

M‐Doped Al₂TiO₅ (M=Cr, Mn, Co) Solid Solutions and their Use as Ceramic Pigments