Effect of B2O3 addition on optical properties of Zirconium and Hafnium tetrafluorides in polycrystalline and thin film states

V.F. Zinchenko; G.V. Volchak; O.V. Mozkova; O.H. Yeriomin; P.H. Doha

doi:10.15330/pcss.24.3.484-489

Authors

V.F. Zinchenko O.V. Bogatsky Physico-Chemical Institute of National Academy of Sciences of Ukraine, Оdesа
G.V. Volchak O.V. Bogatsky Physico-Chemical Institute of National Academy of Sciences of Ukraine, Оdesа
O.V. Mozkova State Enterprise for Special Instrument Making «Аrsenal», Kyiv, Ukraine
O.H. Yeriomin O.V. Bogatsky Physico-Chemical Institute of National Academy of Sciences of Ukraine, Оdesа, Ukraine
P.H. Doha O.V. Bogatsky Physico-Chemical Institute of National Academy of Sciences of Ukraine, Оdesа

DOI:

https://doi.org/10.15330/pcss.24.3.484-489

Keywords:

Zirconium tetrafluoride, Hafnium tetrafluoride, B2O3 additive, IR transmission spectra, thermal evaporation in vacuum, coating, refractive index

Abstract

For the first time, the effect of B₂O₃ additive on the IR transmission spectra of ZrF₄ and HfF₄ samples and the optical properties of the coatings obtained from them was investigated. A significant difference in the shape of the absorption bands and the position of the vibration peaks of the Zirconium tetrafluoride and Hafnium tetrafluoride bonds was revealed. An assumption is made about the influence of ZrF₄ polymorphism on the ratio of the vapor pressures of the specified compounds in the region of the conditional temperature of evaporation in a deep vacuum. The positive effect of the B₂O₃ additive on the rate of evaporation of system samples and condensation on substrates is shown. The values of the refractive indices of the coatings are about 1.53. An exception is the refractive index of the HfF₄ coating (1.57), which can be attributed to the alternative (monoclinic) syngony of its crystal structure.

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