Effect of the addition of zirconium on the photochromic properties of yttrium oxy-hydride
F. Nafezarefi (TU Delft - ChemE/Materials for Energy Conversion and Storage)
Steffen Cornelius (TU Delft - ChemE/Materials for Energy Conversion and Storage)
J. Nijskens (Student TU Delft)
Herman Schreuders (TU Delft - ChemE/Afdelingsbureau)
Bernard Dam (TU Delft - ChemE/Materials for Energy Conversion and Storage)
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Abstract
Thin films of yttrium oxy-hydride have interesting, reversible photochromic properties, the origin of which is poorly understood. To investigate the role of point defect mobility, we probed the effect of lattice contraction as induced by the addition of zirconium. Interestingly, we find no loss of photochromic contrast for Y
1-z
Zr
z
O
x
H
y
films with a small Zr cationic fractions (z < 0.15). At larger fractions the photochromic contrast is reduced. Zirconium is found to slow down the bleaching process, which suggests that the mobility of point defects may play a role in the thermal bleaching process. However, we cannot rule out substitution of zirconium in the YO
x
H
y
lattice which may also affect the photochromic properties.
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