Highly sensitive humidity sensor based on amorphous Al₂O₃nanotubes

Some effects of alloy composition on stress corrosion cracking in Al–Zn–Mg–Cu alloys

“…(A change in colour of the oxide film of AA7022-T651 alloy in distilled water over a narrow temperature range around 40 • C has been observed, suggesting that phase changes do occur [18].) Alternatively, it has been reported that the ordering of adsorbed water changes with relative humidity [49][50][51], and it is not unreasonable to assume the composition of the hydrated oxide would have some influence. On aluminium oxide at relative humidity below 10%, water adsorbs to the surface forming a hydroxide layer.…”

Oxidation rates of aluminium nitride thin films: effect of composition of the atmosphere

“…The other ways of affecting AlN oxidation rate by water vapour are related. Water vapour reacts with numerous materials, metal oxides and other metal compounds, forming stable hydroxides like: In the case of aluminium oxide, this property is commonly used in designing humidity sensors [19,20]. When metal hydroxides decompose, hydrogen appears.…”

Morphology-dependent space charge polarization and dielectric relaxation of CdO nanomorphotypes

“…In such cases, we can generally use parallel R-CPE equivalent circuit instead of parallel R-C circuit. 20,21 For the present impedance spectra, the experimental data are fitted to an equivalent circuit consisting of a resistor and a constant phase element (CPE) instead of a capacitor having capacitance C. The proposed equivalent circuit used for simulating the experimental data in the present work is shown in Fig. 4(d).…”

“…The mean relaxation time is obtained from the relation g ¼ RgCg, 21 which is the inverse of the most intense frequency ! g of the impedance spectrum.…”