TY - JOUR
T1 - Evidence from surface phonons for the (2 × 1) reconstruction of the (101̄4) surface of calcite from computer simulation
AU - Rohl, Andrew L.
AU - Wright, Kate
AU - Gale, Julian D.
PY - 2003/1/1
Y1 - 2003/1/1
N2 - A new force field for modeling calcium carbonate has been derived that corrects deficiencies of previous models. The model correctly reproduces the structure of the gas phase species, as predicted from ab initio calculations, as well as the bulk structure and properties of calcite and aragonite. With this new model, a (2 × 1) reconstruction is predicted to occur for the dominant (101̄4) surface of calcite, involving rotation of half of the surface carbonate anions. This reconstruction matches the results of low energy electron diffraction measured in vacuo and provides the first independent verification of this observation, as well as yielding the atomic detail of the nature of the reconstruction. While there is only a small exothermic energy associated with the formation of the supercell, the presence of an imaginary phonon mode at (1/2,0) in the two-dimensional Brillouin zone for a single surface cell verifies the existence of the reconstruction.
AB - A new force field for modeling calcium carbonate has been derived that corrects deficiencies of previous models. The model correctly reproduces the structure of the gas phase species, as predicted from ab initio calculations, as well as the bulk structure and properties of calcite and aragonite. With this new model, a (2 × 1) reconstruction is predicted to occur for the dominant (101̄4) surface of calcite, involving rotation of half of the surface carbonate anions. This reconstruction matches the results of low energy electron diffraction measured in vacuo and provides the first independent verification of this observation, as well as yielding the atomic detail of the nature of the reconstruction. While there is only a small exothermic energy associated with the formation of the supercell, the presence of an imaginary phonon mode at (1/2,0) in the two-dimensional Brillouin zone for a single surface cell verifies the existence of the reconstruction.
UR - http://www.scopus.com/inward/record.url?scp=0038205945&partnerID=8YFLogxK
U2 - 10.2138/am-2003-5-622
DO - 10.2138/am-2003-5-622
M3 - Article
AN - SCOPUS:0038205945
SN - 0003-004X
VL - 88
SP - 921
EP - 925
JO - American Mineralogist
JF - American Mineralogist
IS - 5
ER -