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Metal Atom‐Ceramic Binding Energies
Author(s) -
Burns Richard P.,
Gabriel Kenneth A.,
Pierce Daniel E.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03779.x
Subject(s) - activation energy , metal , desorption , bond energy , analytical chemistry (journal) , chemistry , enthalpy , binding energy , oxygen , adsorption , thermal desorption , gallium , diffusion , molecule , thermodynamics , chromatography , physics , organic chemistry , nuclear physics
The binding of vapor‐deposited metal and metal oxide films to Al 2 O 3 (0001) and fused silica was investigated using thermal desorption spectroscopy combined with mass spectrometric detection of the desorbed species. The experimental value for E d , the activation energy of desorption, is compared with H L , the calculated bond enthalpy value for an adsorbed metal‐surface oxygen bond. For Ga and Ga 2 O on Al 2 O 3 (0001) and fused silica, the calculated value 2 H L (Ga‐O) = 200.6 kJ·mol ‐1 agrees with experimental E d values and indicates that two gallium‐oxygen bonds are broken in the desorption process ( E d = 2 H L ). For Pb and Sn on Al 2 O 3 (0001) and fused silica, the calculated values 3 H L (Pb–O) and 3 H L (Sn–O) agree with experimental E d values ( E d = 3 H L ). For Cr adsorbed on Al 2 O 3 , H L (Cr–O) = 111.1 kJ·mol ‐1 is calculated for one Cr‐surface oxygen bond. This value agrees, within experimental error, with Stubican's values for the activation energy of surface diffusion for Cr of 110 ± 12, 121 ± 12, and 119 ± 12 kJ·mol ‐1 on Al 2 O 3 , MgO, and MgAl 2 O 4 , respectively. A calculated value of 3 H L (Cr–O) = 333.3 kJ·mol ‐1 agrees within experimental error with literature values for activation energy of volume diffusion of Cr in Al 2 O 3 , MgO, and MgAl 2 O 4 , Agreement between experiment and theory suggests that in these cases the surface bond breaking process involved in desorption and/or diffusion is described by an integral number of metal‐oxygen bonds similar to those in an appropriately chosen bulk oxide model. This agreement suggests that the binding model may be useful in predicting and/or correlating appropriate metal‐ceramic interactions.