Oxidation of Fine Tantalum Particles: Metastable Intermediates and Multistep Kinetics; Oxidation of Metals; Vol. 93
| Parent link: | Oxidation of Metals Vol. 93.— 2020.— [P. 301-328] |
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| Corporate Authors: | , , |
| Outros Autores: | , , , |
| Resumo: | Title screen The metastable tantalum suboxides have been found to be a cause of complicated oxidation behaviour of fine tantalum particles when heated in air at moderate temperatures. Fine Ta 0.02–10 µm particles of bimodal size distribution with average volume maxima of 0.12 and 4 µm were prepared via electric explosion of thin Ta wire in Ar atmosphere. The oxidation reaction proceeded via several intermediate suboxides (Ta6O, Ta4O, Ta2O and TaO2) in which chemical and structure transformations caused multistep kinetics of the oxidation process in a narrow temperature interval of 250–570 °C. Within the interval of 250–400 °C, the oxidation process occurred under diffusion control with an apparent activation energy Ea,1?=?31.6?±?1.2 kJ/mol and the main oxidation products were Ta(O) solid solutions and suboxides Ta6O and Ta4O. In the interval of 400–520 °C, oxidation was accompanied by a low-barrier martensite-like transformation of the lower suboxides resulting in reducing of diffusion limitations of the process (Ea,2?=?4.8?±?1.2 kJ/mol). In the interval of 520–570 °C, oxidation of the larger Ta particles was completed to form Ta2O (Ea,3?=?64.7?±?1.9 kJ/mol). An abrupt decay of Ta2O at temperatures greater than ~?570 °C induced the high-rate oxidation of micron-sized Ta particles, resulting in self-heating of the sample. Режим доступа: по договору с организацией-держателем ресурса |
| Idioma: | inglês |
| Publicado em: |
2020
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| Assuntos: | |
| Acesso em linha: | https://doi.org/10.1007/s11085-020-09957-8 |
| Formato: | Recurso Electrónico Capítulo de Livro |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=662751 |
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| 200 | 1 | |a Oxidation of Fine Tantalum Particles: Metastable Intermediates and Multistep Kinetics |f A. V. Korshunov, A. V. Pustovalov, T. P. Morozova, D. O. Perevezentseva | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References.: 50 tit.] | ||
| 330 | |a The metastable tantalum suboxides have been found to be a cause of complicated oxidation behaviour of fine tantalum particles when heated in air at moderate temperatures. Fine Ta 0.02–10 µm particles of bimodal size distribution with average volume maxima of 0.12 and 4 µm were prepared via electric explosion of thin Ta wire in Ar atmosphere. The oxidation reaction proceeded via several intermediate suboxides (Ta6O, Ta4O, Ta2O and TaO2) in which chemical and structure transformations caused multistep kinetics of the oxidation process in a narrow temperature interval of 250–570 °C. Within the interval of 250–400 °C, the oxidation process occurred under diffusion control with an apparent activation energy Ea,1?=?31.6?±?1.2 kJ/mol and the main oxidation products were Ta(O) solid solutions and suboxides Ta6O and Ta4O. In the interval of 400–520 °C, oxidation was accompanied by a low-barrier martensite-like transformation of the lower suboxides resulting in reducing of diffusion limitations of the process (Ea,2?=?4.8?±?1.2 kJ/mol). In the interval of 520–570 °C, oxidation of the larger Ta particles was completed to form Ta2O (Ea,3?=?64.7?±?1.9 kJ/mol). An abrupt decay of Ta2O at temperatures greater than ~?570 °C induced the high-rate oxidation of micron-sized Ta particles, resulting in self-heating of the sample. | ||
| 333 | |a Режим доступа: по договору с организацией-держателем ресурса | ||
| 461 | |t Oxidation of Metals | ||
| 463 | |t Vol. 93 |v [P. 301-328] |d 2020 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a tantalum | |
| 610 | 1 | |a fine particles | |
| 610 | 1 | |a thermogravimetry | |
| 610 | 1 | |a oxidation | |
| 610 | 1 | |a metastable suboxides | |
| 610 | 1 | |a multistep kinetics | |
| 610 | 1 | |a тантал | |
| 610 | 1 | |a термогравиметрия | |
| 610 | 1 | |a окисление | |
| 610 | 1 | |a многоступенчатые процессы | |
| 701 | 1 | |a Korshunov |b A. V. |c chemist |c Professor of Tomsk Polytechnic University, Candidate of chemical sciences |f 1970- |g Andrey Vladimirovich |3 (RuTPU)RU\TPU\pers\33141 |9 16962 | |
| 701 | 1 | |a Pustovalov |b A. V. |c specialist in the field of electrical engineering |c Associate Scientist of Tomsk Polytechnic University |f 1986- |g Aleksey Vitalievich |3 (RuTPU)RU\TPU\pers\33698 |9 17329 | |
| 701 | 1 | |a Morozova |b T. P. |c chemist |c Engineer, Research and Analytical Center, Tomsk Polytechnic University |f 1958- |g Tatjyana Petrovna |3 (RuTPU)RU\TPU\pers\28914 | |
| 701 | 1 | |a Perevezentseva |b D. O. |c Chemist |c Associate Professor of Tomsk Polytechnic University, Candidate of chemical sciences |f 1979- |g Dariya Olegovna |3 (RuTPU)RU\TPU\pers\33799 |9 17397 | |
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