Heteroepitaxial Growth of a Manganese Carbonate secondary Nano-Phase on the (101{sub 4}) Surface of Calcite in Solution
Heteroepitaxy of a manganese carbonate phase with nanometer dimensions on the (101{sub 4}) surface of calcite (CaCO3) using an AFM has been observed in solution during dissolution of calcite when the ion activity product of Mn2? and CO32- nears the solubility limit of MnCO3. Growth-rate observations at different Mn concentrations, coupled with XPS and EPR measurements, suggest that the resulting phase is Mn05Ca05CO3. These islands, while growing many microns in length along the[22{sub 1}] direction, have a uniform width in the range of 120-240 nm and a uniform height of approximately 2.7 nm, corresponding to nine atomic layers. The islands cease growing when they encounter step edges and have been observed to dissolve when undercut by a growing etch pit.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 15005501
- Report Number(s):
- PNNL-SA-36252; SUSCAS; 4391; KC0303020; TRN: US200412%%363
- Journal Information:
- Surface Science, Vol. 524, Issue 1-3; Other Information: PBD: 23 Jan 2003; ISSN 0039-6028
- Country of Publication:
- United States
- Language:
- English
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