Oxygen tracer diffusion in the magnéli phases TinO2n−1

Bagshaw, A.N.; Hyde, B. G.

doi:10.1016/0022-3697(76)90058-5

Cited by 27 publications

(10 citation statements)

References 10 publications

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“…The fact that the (0 01) fringes for the TisO 9 phase disappeared more quickly than those of the Ti6011 phase indicates that it has a higher oxygen diffusion rate. This observation is consistent with the available data on oxygen diffusion which shows that the diffusion coefficient for Ti 5 09 is about a factor of 5 greater than that for Ti6Ot~ [28].…”

Section: In S I T U E L E C T R O N B E a M H E A T I N Gsupporting

confidence: 93%

Electron microscope study of non-stoichiometric titania

Reece

Morrell

1991

J Mater Sci

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The distribution and coexistence of Magn61i phases (TinO2n_ 1 ) with n = 4, 5 and 6 in hydrogen-reduced Ti02 has been investigated using transmission electron microscopy. The major phase was Ti~O 9. Ti6011 was found in TisO 9 grains in the form of narrow lamellae ( < 10 nm wide) epitaxially intergrown on (001 ) planes. The Ti407 phase, however, was never observed as a second phase in TisO 9 grains but formed single-phase grains. The TisO 9 phase was twinned on the (01 1 )r planes of the rutile subcell structure and the Ti6011 lamellae were pinned to these twins. This pinning may be responsible for the hysteresis that occurs during the oxidation-reduction of non-stoichiometric Ti02. We also report observations on in situ oxidation of the line phases.

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Section: In S I T U E L E C T R O N B E a M H E A T I N Gsupporting

confidence: 93%

Electron microscope study of non-stoichiometric titania

Reece

Morrell

1991

J Mater Sci

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“…The diffusion coefficients for cations in TiO 2 were also reported by Johnson, Johnson et al ., and Wittke . Extensive studies were also reported for oxygen tracer diffusion in TiO 2 …”

Section: Brief Literature Overviewsupporting

confidence: 60%

“…20 Extensive studies were also reported for oxygen tracer diffusion in TiO 2 . [21][22][23][24][25][26][27] The diffusion data in Fig. 2 include the self-diffusion coefficients of 44 Ti and 18 O.…”

Section: Brief Literature Overviewmentioning

confidence: 99%

Diffusion Kinetics of Indium in TiO₂ (Rutile)

et al. 2013

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This work determines the self‐diffusion coefficients of indium in TiO2 single crystal (rutile). Diffusion concentration profiles were imposed by deposition of a thin surface layer of InCl3 on the TiO2 single crystal and subsequent annealing in the temperature range 1073–1573 K. The diffusion‐induced concentration profiles of indium as a function of depth were determined using secondary ion mass spectrometry (SIMS). These diffusion profiles were used to calculate the self‐diffusion coefficients of indium in the polycrystalline In2TiO5 surface layer and the TiO2 single crystal. The temperature dependence of the respective diffusion coefficients, in the range 1073–1573 K, can be expressed by the following formulas: DIn−In2TiO5=1.9×10−13exp(−1420.35emkJ/molRT)[m2s−1] and DIn−TiO2=7.4×10−4exp(−3160.35emkJ/molRT)[m2s−1] The obtained activation energy for bulk diffusion of indium in rutile (316 kJ/mol) is similar to that of zirconium in rutile (325 kJ/mol). The determined diffusion data can be used in selection of optimal processing conditions for TiO2–In2O3 solid solutions.

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“…Samples that contain predominantly trivalent impurities like Cr 3+ , Al 3+ and Fe 3+ would be expected to have higher diffusivities, and those that contain high abundances of Nb 5+ and/or Ta 5+ may have lower diffusivities because these positively charged impurities suppress oxygen vacancy concentrations, The measured temperature dependence of oxygen diffusivity is also similar among the three studies, with reported activation enthalpies of 251, 251 and 283 kJ/mol, respectively. The diffusion coefficients of Bagshaw and Hyde (1976) at 1000 °C are an order of magnitude higher than in the other three studies, and have relatively large errors, attributed by the authors to an inadequate representation of the sample geometry in the bulk exchange experiments employed. These data are closer to those obtained using Cr 3+ -doped (Arita et al 1979) and highly non-stoichiometric (Millot and Picard 1988) rutile samples.…”

Section: Oxygenmentioning

confidence: 62%