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.