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| Autori principali: | , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2015
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| Soggetti: | |
| Accesso online: | https://doi.org/10.1594/PANGAEA.855413 |
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| _version_ | 1867169108756267008 |
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| author | Fischer, Cornelius Finkeldei, Sarah Brandt, Felix Bosbach, Dirk Lüttge, Andreas |
| author_facet | Fischer, Cornelius Finkeldei, Sarah Brandt, Felix Bosbach, Dirk Lüttge, Andreas |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The long-term stability of ceramic materials that are considered as potential nuclear waste forms is governed by heterogeneous surface reactivity. Thus, instead of a mean rate, the identification of one or more dominant contributors to the overall dissolution rate is the key to predict the stability of waste forms quantitatively. Direct surface measurements by vertical scanning interferometry (VSI) and their analysis via material flux maps and resulting dissolution rate spectra provide data about dominant rate contributors and their variability over time. Using pyrochlore (Nd2Zr2O7) pellet dissolution under acidic conditions as an example, we demonstrate the identification and quantification of dissolution rate contributors, based on VSI data and rate spectrum analysis. Heterogeneous surface alteration of pyrochlore varies by a factor of about 5 and additional material loss by chemo-mechanical grain pull-out within the uppermost grain layer. We identified four different rate contributors that are responsible for the observed dissolution rate range of single grains. Our new concept offers the opportunity to increase our mechanistic understanding and to predict quantitatively the alteration of ceramic waste forms. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_855413 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Pore depth evolution of a pyrochlore pellet Fischer, Cornelius Finkeldei, Sarah Brandt, Felix Bosbach, Dirk Lüttge, Andreas Center for Marine Environmental Sciences; Height; MARUM; Time in hours; Vertical scanning interferometry (VSI) The long-term stability of ceramic materials that are considered as potential nuclear waste forms is governed by heterogeneous surface reactivity. Thus, instead of a mean rate, the identification of one or more dominant contributors to the overall dissolution rate is the key to predict the stability of waste forms quantitatively. Direct surface measurements by vertical scanning interferometry (VSI) and their analysis via material flux maps and resulting dissolution rate spectra provide data about dominant rate contributors and their variability over time. Using pyrochlore (Nd2Zr2O7) pellet dissolution under acidic conditions as an example, we demonstrate the identification and quantification of dissolution rate contributors, based on VSI data and rate spectrum analysis. Heterogeneous surface alteration of pyrochlore varies by a factor of about 5 and additional material loss by chemo-mechanical grain pull-out within the uppermost grain layer. We identified four different rate contributors that are responsible for the observed dissolution rate range of single grains. Our new concept offers the opportunity to increase our mechanistic understanding and to predict quantitatively the alteration of ceramic waste forms. |
| title | Pore depth evolution of a pyrochlore pellet |
| topic | Center for Marine Environmental Sciences; Height; MARUM; Time in hours; Vertical scanning interferometry (VSI) |
| url | https://doi.org/10.1594/PANGAEA.855413 |