Stabilization of elements in unusual oxidation states and temperature-reversible dynamics of electron pairs in oxide glasses. EPR-investigation

Aleksandrov, A.I.; Bubnov, N.N.; Prokof’ev, A.I.

Авторы: Aleksandrov A.I., Bubnov N.N., Prokof’ev A.I.
Журнал: Applied Magnetic Resonance
Том: 9
Номер: 2
Год издания: 1995
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 251
Последняя страница: 266
DOI: 10.1007/bf03162045
Аннотация: Binary, three-component and multi-component borate, phosphate, germanate and silicate glasses,as well as barium-aluminophosphate glasses eontaining oxide of metals of (I-V)B groups, metals of thefirst transition se¡ from titanium to nickel, niobium, tantalum, molybdenum and tungsten are investigatedby EPR and optical speclroscopy at 77 and 300 K. The formation of metal ions in unusualoxidation states, such as Ag ~ Zn 1+, Cd I+, Hg 1+, Ga 2+, T12+, Ge 3+, Sn 3+, Pb 3+, Sb 4+, Bi 4+, Nb 4+, Ti 3+,Ni 1+, Mo 5+, Cr 3+, and Cr 5+ was established. They were stabilized in the aforementioned glasses at specificcompositions of components for ah unlimited time at 300 K. It is shown that the reversible lowtemperature effect of disproportionation on atoms sueh as Nb, Ti, V, Mo, and W proves that in glassunder ionizing gamma-radiation and temperature the reactions of disproportionation occur together withthe reconstruction of conformation, the electron density transfer, the atomic displacement and the change(reversible or not) of a local structure of glass. Ir is shown that the formation of metal clusters in glassis connected with reaction of disproportionation.1. Introduction
Добавил в систему: Александров Алексей Иванович

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Stabilization of elements in unusual oxidation states and temperature-reversible dynamics of electron pairs in oxide glasses. EPR-investigationстатья

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