Phase transitions and guest positions state in the nanodisperse TiO2 caused by laser irradiation

I.M. Budzuliak; L.S. Yablon; V.O. Kotsiubynskyi; R.V. Ilnitsky; I.I. Budzuliak; O.V. Morushko; N.R. Ilnitsky; T.R. Sorohtei

doi:10.15330/pcss.25.3.520-527

Authors

I.M. Budzuliak Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
L.S. Yablon Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
V.O. Kotsiubynskyi Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
R.V. Ilnitsky Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
I.I. Budzuliak Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
O.V. Morushko Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
N.R. Ilnitsky Ivano-Frankivsk National Medical University, Ivano-Frankivsk, Ukraine
T.R. Sorohtei Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.25.3.520-527

Keywords:

anatase, laser irradiation, intercalation, Mössbauer spectroscopy

Abstract

The laser irradiation effect on the guest positions state in TiO₂ (anatase) that facilitates lithium ions access to these positions was studied. The method of chemical potential spectroscopy revealed sharp voltage drops and the associated minima in the dependence of the intercalation degree x on the electromotive force ε dx/dε, caused by host-guest system ordering and by coexistence of two phases. From the analysis of the entropy change ΔS in dependence on the introduced lithium amount, it was found that ΔS increase is associated with additional guest positions generation and an increase of the oscillational degrees of freedom quantity in the intercalant. The combined effect of laser irradiation and iron doping on nanodispersed TiO₂ provides a stable discharge voltage over a wide range of lithium guest load.

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