Pore depth evolution of a pyrochlore pellet

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.

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Cite this as

Fischer, Cornelius, Finkeldei, Sarah, Brandt, Felix, Bosbach, Dirk, Lüttge, Andreas (2015). Dataset: Pore depth evolution of a pyrochlore pellet. https://doi.org/10.1594/PANGAEA.855413

DOI retrieved: 2015

Additional Info

Field Value
Imported on November 29, 2024
Last update November 29, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.855413
Author Fischer, Cornelius
Given Name Cornelius
Family Name Fischer
More Authors
Finkeldei, Sarah
Brandt, Felix
Bosbach, Dirk
Lüttge, Andreas
Source Creation 2015
Publication Year 2015
Resource Type text/tab-separated-values - filename: Pore_depth_evolution
Subject Areas
Name: HumanDimensions

Related Identifiers
Title: Direct Measurement of Surface Dissolution Rates in Potential Nuclear Waste Forms: The Example of Pyrochlore
Identifier: https://doi.org/10.1021/acsami.5b04281
Type: DOI
Relation: IsSupplementTo
Year: 2015
Source: ACS Applied Materials & Interfaces
Authors: Fischer Cornelius , Finkeldei Sarah , Brandt Felix , Bosbach Dirk , Lüttge Andreas .