Einkristallzüchtung von Titandioxid durch chemische Transportreaktion

Wäsch, E.

doi:10.1002/crat.19720070121

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…In addition, rutile single crystals were used as substrates in model experiments to study the formation of BaTiO 3 thin films by solid state reactions with BaCO 3 and BaO [14,15]. Anatase single crystals are more difficult to obtain with appropriate size [16][17][18]. Thus, relatively few surface studies have been conducted on anatase surfaces and no experiments concerning solid state reactions with anatase surfaces were performed.…”

Section: Introductionmentioning

confidence: 99%

Epitaxial growth of TiO2 thin films on SrTiO3, LaAlO3 and yttria-stabilized zirconia substrates by electron beam evaporation

2007

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Section: Introductionmentioning

confidence: 99%

Epitaxial growth of TiO2 thin films on SrTiO3, LaAlO3 and yttria-stabilized zirconia substrates by electron beam evaporation

2007

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“…Anatase crystals were grown previously below 750 °C by chemical transport reactions employing HCl, − HBr, or CCl 4 12 as transport agents. However, the reducing atmosphere created by hydrogen halides favors the formation of lower oxides and of rutile .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Photoelectrochemical Investigation of Single-Crystal Anatase

et al. 1996

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Single crystals of TiO2 anatase containing 0.22% of Al and traces of V, Zr, Nb, and La were grown by chemical transport reactions employing TeCl4 as the transporting agent. Electrodes having the (101) face exposed doped by reduction with hydrogen were employed. The electrochemical and photoelectrochemical behavior of a single crystal of anatase were scrutinized for the first time. Properties were compared to those of single-crystal rutile having the (001) face exposed. Impedance analysis established that the flatband potential of anatase (101) is shifted negatively by 0.2 V with regards to that of rutile (001). Interfacial capacitance measurements under forward bias indicate smaller density of surface states on anatase. Photoelectrochemical oxidation of water occurs on both rutile and anatase with incident photon-to-current conversion efficiencies close to unity at λ = 300 nm. From the comparison of U fb and E g, it follows that anatase (101) and rutile (001) electrodes differ mainly in the position of the conduction band edge. The complete photoelectrolysis of water to H2 and O2 is thermodynamically possible on anatase only. Photosensitized electron injection from adsorbed cis-Ru[L2(SCN)2] (L = 2,2‘-bipyridyl-4,4‘-dicarboxylic acid) proceeds with similar efficiency on both types of electrodes. However, light-induced charge separation on the single-crystal electrodes is about three times less efficient compared with nanoscopic anatase films. Anatase (101) is strikingly more active for electrochemical insertion of Li+ than rutile (001). The diffusion coefficients for Li+ insertion and extraction were estimated to be 2 × 10-13 and 6 × 10-13 cm2/s, respectively.

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“…3 Following this pioneering work, several groups reported on the successful growth of anatase. [4][5][6][7][8] From the end of the 1990s, interest in bulk material began fading away, in part due to the high production costs, but mostly because the mainstream research was focused on nano-sized crystals, which are not suitable for the studies where the anisotropy of physical properties plays an important role. The alternative is natural single crystals whose quality, however, suffers from a high and uncontrollable amount of various impurities, defects, and crystal imperfections.…”

Section: Introductionmentioning

confidence: 99%

Dominant hydrogen complex in natural anatase TiO2

Lavrov

Chaplygin

Herklotz

et al. 2021

Journal of Applied Physics

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A study combining vibrational spectroscopy and first-principles theory is presented for a hydrogen-related defect in natural anatase TiO 2 that is characterized by an O-H vibrational mode at 3373 cm À1 (10 K). Based on complementary Raman scattering, IR absorption, electron paramagnetic resonance, and secondary ion mass spectrometry data supported also by ab initio calculations, it is tentatively proposed that the defect responsible for the 3373 cm À1 line includes two hydroxyl units located next to a substitutional iron atom, Fe Ti H 2 . The defect may exist in at least two charge states, whereby the 3373 cm À1 line is associated with the positive charge state of the complex.

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Einkristallzüchtung von Titandioxid durch chemische Transportreaktion

Cited by 11 publications

References 4 publications

Epitaxial growth of TiO2 thin films on SrTiO3, LaAlO3 and yttria-stabilized zirconia substrates by electron beam evaporation

Epitaxial growth of TiO2 thin films on SrTiO3, LaAlO3 and yttria-stabilized zirconia substrates by electron beam evaporation

Electrochemical and Photoelectrochemical Investigation of Single-Crystal Anatase

Dominant hydrogen complex in natural anatase TiO2

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