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Title: Evolution of Strain in Heteroepitaxial Cadmium Carbonate Overgrowths on Dolomite

The evolution and accommodation of lattice strain in an epitaxial mineral film grown on an isostructural substrate were observed as a function of film thickness. Cadmium carbonate films (approximately CdCO 3 (otavite) in composition) were grown on the (104) surface of CaMg(CO 3) 2 (dolomite) from aqueous solutions that were supersaturated with respect to both pure otavite and Cd-rich (Cd 1-xCa x)CO 3. Specular and non-specular X-ray reflectivity (XR) revealed that the structure and strain of the otavite overgrowths evolved in a manner that is fully consistent with a Stranski-Krastanov growth mode. Otavite films initially grew as coherently strained films, up to an average thickness of ~15 Å, with lateral compressive strains and an expansion of the vertical film lattice spacing resulting in a unit cell volume consistent with pure otavite. Thicker films (>15 Å) became incommensurate with the substrate, having lattice parameters that are indistinguishable from pure otavite. These results indicate that the evolution of these mineral films is controlled by epitaxy and are consistent with the growth of essentially pure otavite films. Lastly, these results provide a foundation for understanding the stability of thin-film overgrowths in the natural environment.
 [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [1] ; ORCiD logo [3]
  1. Univ. of Illinois, Chicago, IL (United States). Dept. of Earth and Environmental Sciences
  2. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
  4. Univ. of Delaware, Newark, DE (United States). Dept. of Geological Sciences
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Crystal Growth and Design
Additional Journal Information:
Journal Volume: 18; Journal Issue: 5; Journal ID: ISSN 1528-7483
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; Cadmium; calcium carbonate; calcite; dolomite; heteroepitaxial growth
OSTI Identifier: