TiO2(B) a new form of titanium dioxide and the potassium octatitanate K2Ti8O17

Marchand, R.; Brohan, Luc; Tournoux, M.

doi:10.1016/0025-5408(80)90076-8

Cited by 560 publications

(378 citation statements)

References 12 publications

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“…It is at the detection limit. The finite η 2 = 0.64 (2) indicates that the surface termination of rutile is different from that of anatase, as expected. The second largest fraction f 3 resembles somehow the volume fraction of Eusolex T-2000, i.e.…”

supporting

confidence: 73%

“…The solid line in the time spectrum is the result of a fit with the following two components: the first has a frequency ω Q,1 = 25.9(1.0) Mrad/s and a Lorentzian damping δ 1 = 29(3)%, the second has a frequency ω Q,2 = 30.7(8) Mrad/s and a Lorentzian damping δ 2 = 6(4)%. For the first component we fitted η 1 = 0.64(2) whereas for the second component we fitted η 2 = 0.32 (2). The first component has a fraction f 1 = 88(4)% whereas the second has f 2 = 12(4)%.…”

Section: Defect and Diffusion Forum Vol 311mentioning

confidence: 99%

“…The fractions are 78(6)% and 22(6)%, quite compatible with the estimated surface to volume ratio. This ratio can be estimated as follows: for anatase the unit cell volume is 0.136 nm 3 and in a cube of 6 nm length we have approximately 3,200 Ti-atoms; the surface is 216 nm 2 and using an estimated Ti-OH distance of 0.25 nm we have about 800 near surface Ti-atoms; this gives a ratio of surface to volume atoms of 0.3 or a volume fraction of 80%. The widths of the volume and the surface signals are distinctly wider than that for the nanowires.…”

Section: Defect and Diffusion Forum Vol 311 153mentioning

confidence: 99%

“…The two important modifications are anatase and rutile with slightly different absorption edges. There is a further modification which thus far did not receive adequate attention, the TiO 2 (B) modification, a metal oxide bronze [2]. All polymorphs are composed of Ti-O octahedra, which share edges and corners.…”

Section: Introductionmentioning

confidence: 99%

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TiO2 Nanomaterials Studied by 44Ti(EC)44Sc Time Differential Perturbed Angular Correlations: Volume and Surface Properties

Butz

Ryu

Jánkuhn

et al. 2011

DDF

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Abstract. TiO 2 nanoparticles (anatase) with diameters between 2 and 4 nm were synthesized by controlled hydrolysis of a solution of titanium (IV)isopropoxide to which 44 Ti in 4M HCl was added. Inactive nanoparticles were analyzed by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), the active ones were analyzed by measuring the nuclear quadrupole interaction (NQI) of the I = 1 state in 44 Sc using time differential perturbed angular correlation (TDPAC). Rather broad distributions were obtained. We also synthesized nanowires with typical diameters of 2 nm and 100 nm length using shape controllers. They were analyzed by HRTEM and XRD. The material turned out to be TiO 2 (B). The 44 Ti was added by impregnation and diffusion at 180°C for two hours. Two well-defined NQI signals were observed which we tentatively assigned to the "volume" fraction and the "surface" fraction, i.e. 44 Ti-probes with OH-termination. In addition, we studied AMT-100 (anatase, uncoated, 6 nm), Eusolex T-2000 (rutile, Al 2 O 3 -coated, 20×20×100 nm 3 , simethicone additive) and P25 (mainly anatase, uncoated, 20 nm diameter) using the impregnation and diffusion method. P25 and the isolated rutile fraction from P25 yield spectra which correspond to anatase and rutile volume signals plus their surface signals, respectively. TDPAC thus proved very useful in characterizing the nanomaterials, especially their disorder, by measuring the NQI. In addition, information on surface properties is obtained. The relatively narrow surface signals indicate a lower degree of disorder and are possibly also a result of partial motional averaging of Ti-signals with OH-bonds due to mobile H-atoms.

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supporting

confidence: 73%

Section: Defect and Diffusion Forum Vol 311mentioning

confidence: 99%

Section: Defect and Diffusion Forum Vol 311 153mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

TiO2 Nanomaterials Studied by 44Ti(EC)44Sc Time Differential Perturbed Angular Correlations: Volume and Surface Properties

Butz

Ryu

Jánkuhn

et al. 2011

DDF

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“…It was recently reported that TiO 2 (B) nanowires 7) exhibit large intercalation capacities of more than 200 mAh g ¹1 . TiO 2 (B) is a metastable monoclinic modification of titanium dioxide; 8) its large theoretical capacity, 335 mAh g…”

Section: Introductionmentioning

confidence: 99%

Lithium intercalation properties of tetratitanates and octatitanates

Suzuki

Miyayama

2010

J. Ceram. Soc. Japan

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The lithium intercalation properties of alkai tetratitanate (Li 2 Ti 4 O 9 ·1.1H 2 O, Na 1.5 H 0.5 Ti 4 O 9 ·0.53H 2 O) and octatitanate with various amounts of hydrated water (H 2 Ti 8 O 17 ·nH 2 O; n = 0.41, 0.96, 1.5) were examined. Alkali tetratitanates were obtained by ion exchange of the starting tetratitanate hydrate (H 2 Ti 4 O 9 ·1.9H 2 O) and subsequent heat treatment. Octatitanates were prepared by heat treatment of the starting tetratitanate hydrate. The prepared titanates exhibited a reversible capacity corresponding to a reduction of half of the Ti atoms from a tetravalent state to a trivalent state. This indicates that the reaction activity of the host oxide layer of titanates is not affected by the condensation reaction during transformation from tetratitanate to octatitanate. H 2 Ti 8 O 17 ·0.41H 2 O showed the largest capacity and best rate capability among the prepared titanates; this is because of its relatively small chemical formula weight per Ti atom. The difference in the rate capability of the titanates is caused by the steric effects of hydrated water molecules in the lithium diffusion path along the b-axis.

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Metal Oxide Nanoparticles

Fernández

Rodríguez

2005

Encyclopedia of Inorganic Chemistry

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This article covers the fundamental science, synthesis, characterization, physicochemical properties, and applications of oxide nanomaterials. It also explains the fundamental aspects that determine the growth and behavior of these systems, briefly examines synthetic procedures using bottom‐up and top‐down fabrication technologies, discusses the sophisticated experimental techniques and state‐of‐the‐art theory results used to characterize the physicochemical properties of oxide solids, and describes the current knowledge concerning key oxide materials with important technological applications.

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TiO2(B) a new form of titanium dioxide and the potassium octatitanate K2Ti8O17

Cited by 560 publications

References 12 publications

TiO<sub>2</sub> Nanomaterials Studied by <sup>44</sup>Ti(EC)<sup>44</sup>Sc Time Differential Perturbed Angular Correlations: Volume and Surface Properties

TiO<sub>2</sub> Nanomaterials Studied by <sup>44</sup>Ti(EC)<sup>44</sup>Sc Time Differential Perturbed Angular Correlations: Volume and Surface Properties

Lithium intercalation properties of tetratitanates and octatitanates

Metal Oxide Nanoparticles

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