Ar+	Argon ion
Albound	Al bound
Almet	Metallic Al
AlO,OH	Al bound in in the oxide and hydroxide
Al2O3	Aluminium (III) oxide
Al(OH)3	Aluminium hydroxide
α = c(AlO,OH)/c(OAl)	Ratio of (Al/O) bound in the surface oxide and hydroxide
BE	Binding energy
c(AlO,OH)	Concentration of Al bound in the oxide and hydroxide
c(OAl)	Concentration of oxygen bound in the surface oxide and hydroxide
ICP-OES	Inductively coupled plasma optical emission spectroscopy
KE	Kinetic energy
Na5P3O10	Sodium phosphate
OAl	Oxygen bound in the surface oxide and hydroxide
p	Surface share of oxide
p[AlO,OHO3/2]	Assumed composition of surface oxide
(1 − p)	Surface share of hydroxide
(1 − p)[AlO,OH(OAlH)3]	Assumed composition of surface hydroxide
Sa	Average height of selected area
Sq	Root–Mean–Square height of selected area
Sp	Maximum peak height of selected area
Sv	Maximum valley depth of selected area
Sz	Maximum height of selected area
S10z	Ten-point height of selected area
Ssk	Skewness of selected area
Sku	Kurtosis of selected area
XPS	X-ray photoelectron spectroscopy