Effects of gamma irradiations on reactive pulsed laser deposited vanadium dioxide thin films

Abstract

of VO2 thin films by Reactive pulsed laser deposition has been achieved.  VO2 films shows the potential to be advantageously used for thermal shielding of small spacecrafts as their properties remain mainly unaffected when subjected to gamma ray doses similar to those encountered during space missions.  The long range crystal structure of VO2 remains intact upon irradiation on different doses up to 100 kGy  XPS reveals a shift from V 4+ to V 5+ oxidation state upon irradiation, which is a consequence of frenkel pair formation on the surface rather than crystal structure modification.  Irradiated films show the characteristic SMT of VO2, although the electrical and optical properties are slightly affected.

Ion Beams for Space Applications

“…This is done by irradiating the coatings with particles that are predicted to be encountered, and at the energies at which they are predicted to be encountered. The results of similar experiments can be seen in [9][10][11][12][13][14].…”

Chemical and thermal properties of VO2 mechanochemically derived from V2O5 by co-milling with paraffin wax

“…This is dissimilar to all the related samples examined, and hence, demonstrates a unique feature of the oxidation state of vanadium. Broadening and shi of V 2p3/2 peak toward higher binding energy side upon irradiation of gamma ray were observed by Madiba et al 24 on well-dened VO 2 thin lm due to the introduction of structural disorder. They also observed a similar increase in the thermal hysteresis as in our present study.…”

Co-60 GAMMA RADIATION INFLUENCES ON THE ELECTROCHEMICAL, PHYSICAL AND ELECTRICAL CHARACTERISTICS OF RARE-EARTH DYSPROSIUM OXIDE (Dy 2 O 3 )

“…The atomic displacement may leave lattice vacancies, lodge in interstitial locations, etc. [25], [26]. The binding energy shifts to lower values are due to bonds breaking and the formation of the vacancies in the structure [20], [27].…”

“…The binding energy shifts to lower values are due to bonds breaking and the formation of the vacancies in the structure [20], [27]. However, the binding energy shift toward higher values may be due to either the formation of the interstitial atoms [26], or the passivation of the dangling bonds thanks to the irradiation generated local heating [19]. For the passivation process, both Dy and O related states should shift toward higher binding energies.…”