Effect of B2O3 addition to Magnesium, Zirconium, Hafnium fluorides on the parameters of thin films formed from them

V.F. Zinchenko; O.V. Mozkova; I.R. Magunov; G.V. Volchak; O.G. Ieriomin; A.V. Babenko

doi:10.15330/pcss.25.1.120-126

Authors

V.F. Zinchenko O.V. Bogatsky Physico-Chemical Institute NAS of Ukraine, Odesa, Ukraine
O.V. Mozkova State Enterprise of Special Instrumentation «Arsenal» of the State Space Agency of Ukraine, Кyiv, Ukraine
I.R. Magunov O.V. Bogatsky Physico-Chemical Institute NAS of Ukraine, Odesa, Ukraine
G.V. Volchak O.V. Bogatsky Physico-Chemical Institute NAS of Ukraine, Odesa, Ukraine
O.G. Ieriomin O.V. Bogatsky Physico-Chemical Institute NAS of Ukraine, Odesa, Ukraine
A.V. Babenko O.V. Bogatsky Physico-Chemical Institute NAS of Ukraine, Odesa, Ukraine

DOI:

https://doi.org/10.15330/pcss.25.1.120-126

Keywords:

metal fluorides, B2O3 additive, thermal evaporation in a vacuum, thin film coating, refractive index

Abstract

For the first time, the influence of a B₂O₃ additive on Magnesium, Zirconium, and Hafnium fluorides, encompassing their structural and optical properties, was subjected to investigation. The phase composition of the MgF₂–B₂O₃ system was ascertained through the utilization of X-ray phase analysis and infrared (IR) transmission spectroscopy. Notably, a discernible presence of a newly formed phase, characterized as a complex compound of Magnesium fluoroborate (Mg₃(BO₃)F₃), was unveiled. In the instances of the ZrF₄–B₂O₃ and HfF₄–B₂O₃ systems, the modification in the characteristics of IR spectra was attributed to the α → β phase transitions occurring within the respective metal tetrafluorides. Subsequently, thin-film coatings of metal fluorides treated with the B₂O₃ additive were fabricated employing thermal evaporation under vacuum conditions. It was determined that the refractive index of MgF₂ experienced a slight reduction (from 1.42 to 1.41) following the incorporation of the additive, while the mechanical strength exhibited a marginal augmentation. Conversely, the refractive index of coatings derived from Zirconium and Hafnium tetrafluorides, subsequent to heat treatment with B₂O₃, remained nearly constant at 1.53 across all samples. Additionally, an evaluation of the volatility of the samples was carried out, revealing a slight increase in volatility following treatment with the B₂O₃ additive, with the exception of the MgF₂–B₂O₃ system. A plausible mechanism elucidating the influence of B₂O₃ on oxygen-containing impurities present in metal fluorides is proposed.

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