TY  - JOUR
AU  - Bombis, C.
AU  - Emundts, A.
AU  - Nowicki, M.
AU  - Bonzel, D. I.
TI  - Absolute surface free energies of Pb
JO  - Surface science
VL  - 511
SN  - 0039-6028
CY  - Amsterdam
PB  - Elsevier
M1  - PreJuSER-25855
SP  - 83 - 96
PY  - 2002
N1  - Record converted from VDB: 12.11.2012
AB  - Three-dimensional (3D) equilibrium crystal shapes (ECS) of Pb are utilized for the first time to determine absolute surface free energies via a quantitative evaluation of the measured ECS and published values of step free energies of vicinal (1 1 1) surfaces. 3D images of Pb crystallites are obtained by scanning tunneling microscopy at 323-393 K. Line scans through high symmetry <1 1 0> azimuths are transformed into an anisotropic relative surface free energy, gamma(theta, T). The absolute surface free energy of Pb(1 1 1) is obtained from the limiting slopes, df(theta, T)/d tan theta, of the orientation dependent f(theta, T) gamma(theta, T)/ cos theta at the boundaries of the (1 1 1) facet, located at theta = 0degrees. This value is 25.7 +/- 1.4 meV/Angstrom(2) or 440 +/- 22 mJ/m(2). Absolute surface free energies of other low-index orientations, such as (1 0 0), (1 1 0) etc. are calculated from the relative anisotropy of gamma(theta)/gamma(1 1 1). It is found that surface free energies of orientation (h k l), expressed in meV/atom, scale with the number of bonds broken in forming such a surface. Free energies of steps bounding other facets, such as (1 0 0), (1 1 0), (1 1 2), (1 1 3) and (2 2 1), are evaluated in the [0 1 (1) over bar] zone, using the corresponding facet radii and the absolute surface free energies of those facets. (C) 2002 Published by Elsevier Science B.V.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000176584000014
DO  - DOI:10.1016/S0039-6028(02)01554-6
UR  - https://juser.fz-juelich.de/record/25855
ER  -