Opposing Effects of Impurity Ion Sr2+ on the Heterogeneous Nucleation and Growth of Barite (BaSO4)
Journal Article
·
· Crystal Growth and Design
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Columbia Univ., New York, NY (United States)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
Nucleation of barite (BaSO4) has broad implications in geological, environmental, and materials sciences. While impurity metals are common, our understanding of how they impact nucleation remains dim. In this work, we used classical optical microscopy compared to fast X-ray nanotomography (XnT) to investigate heterogeneous nucleation of barite on silica in situ with Sr2+ as an impurity ion. The observed barite nucleation rates were consistent with classical nucleation theory (CNT), where barite crystals displayed a nonuniform size distribution, exhibiting distinct morphologies and incubation periods in Sr-free solutions. While undetectable with optical microscopy, nanotomography revealed that addition of Sr2+ enhances nucleation rates driven by the pre-factor in CNT, likely because both adsorbed Ba2+ and Sr2+ act as precursor sites on which nucleation occurs. Sr2+ simultaneously inhibits growth, however, leading to a homogeneous distribution of smaller crystals. This finding will enable an improved predictive understanding of nucleation in natural and synthetic environments.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; SC0012704
- OSTI ID:
- 1822057
- Alternate ID(s):
- OSTI ID: 1830196
- Report Number(s):
- BNL--222368-2021-JAAM
- Journal Information:
- Crystal Growth and Design, Journal Name: Crystal Growth and Design Journal Issue: 10 Vol. 12; ISSN 1528-7483
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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