Funct. Mater. 2022; 29 (3): 437-442.

doi:https://doi.org/10.15407/fm29.03.437

Some physicochemical aspects of oxo-species formation in melts of CsBr-LiBr and CsBr-LiBr-YBr3 systems at 973 K

V.L.Cherginets1, A.L.Rebrov1, A.Yu.Grippa1, T.P.Rebrova1, T.V.Ponomarenko1, N.V.Rebrova1, A.G.Varich1, O.I.Yurchenko2, V.V. Soloviev2

1Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
2V.N.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
3Yuri Kondratyuk Poltava Polytechnic National University

Abstract: 

Interactions between the admixture oxo-species (as O2- donors) and the most acidic cations being the basis of the melts of CsBr + LiBr and (2CsBr-LiBr) + YBr3 systems containing different amounts of LiBr and YBr3, respectively, were studied at 973 K by the potentiometric method with the use of Pt(O2)YSZ membrane oxygen electrode as reversible to O2-. The addition of LiBr to CsBr melt up to xLiBr = 0.33 (x is mole fraction) results in the formation of Li2O as the main product, K(x,Li2O) = (6.1±1) ·104. The formation of LiO- is almost statistically insignificant 2CsBr-LiBr melt at 973 K is characterized by the upper limit of basicity due to the limited solubility of Li2O (1.23·10-2 mol·kg-1). The addition of YBr3 to 2CsBr-LiBr melt leads to the formation of YO+ complex and its stability constant is K(x,YO+) = 2.4(±0.1)&midddot;102. Together with the composition of the oxo-species the oxobasicity indices, pIL of the said systems were estimated as 3.62 for 2CsBr-LiBr melt and 4.74 for 0.99(2CsBr-LiBr)-0.01YBr3 one. The obtained characteristics are close to those of the analogous chloride systems.

Keywords: 
cesium bromide, lithium bromide, yttrium bromide, melts, potentiometry, oxoacidity, complexation, solubility.

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