Skip to main content

Table 1 Surface energies and transformation energies relative to bulk stable polymorph for several oxides

From: Energetics of nanoparticle oxides: interplay between surface energy and polymorphism†

Oxide Surface energy/J m-2 Transformation energya/kJ mol-1
α-Al2O3 2.6 ± 0.2 0
γ-A1203 1.7 ± 0.1 13.4 ± 2.0
A1OOH (boehmite) 0.5 ± 0.1 -17 ± 1
TiO2 (rutile) 2.2 ± 0.2 0
TiO2 (brookite) 1.0 ± 0.2 0.7 ± 0.4
TiO2 (anatase) 0.4 ± 0.1 2.6 ± 0.4
ZrO2 (monoclinic) 6.5 ± 0.2 0
ZrO2 (tetragonal) 2.1 ± 0.05 9.5 ± 0.4
ZrO2 (amorphous) 0.5 ± 0.05 34 ± 4
Zeolitic silicas 0.09 ± 0.01 7–15
  1. aEnthalpy relative to stable bulk anhydrous polymorph plus H2O (liquid) if applicable.