Kinetics of polaron capture by traps in a lithium niobate crystal

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The problem of reversible transformation and trapping of small-radius polarons in a lithium niobate crystal is considered within the framework of the integral encounter theory which is binary in the concentration of reatants. Analytical solutions are obtained for the relaxation kinetics of polarons, their lifetimes, and the rate constants of the corresponding channels of a multistage reaction controlled by polaron mobility. The temperature and concentration dependences of the observed quantities are analyzed. It is shown that at low temperatures polarons accumulate in a bound state characterized by an anomalously low relaxation rate.

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S. Fedorenko

Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Science

Autor responsável pela correspondência
Email: fedorenk@kinetics.nsc.ru
Rússia, Institutskaya 3, 630090, Novosibirsk

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2. Fig. 1. Dependence of the lifetimes of free and bound polarons on the inverse temperature at different trap concentrations c. Solid lines—c = 1.9 mol. %, dashed lines - c = 0.5 mol. %, dots - c = 0.16 mol. %. Short vertical lines indicate the boundaries of the binary approximation for three concentrations.

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3. Fig. 2. Kinetic relaxation curves of the populations of free and bound polarons at the trap concentration c = 1.9 mol. %; at T = 700 K (solid lines) and T = 600 K (dashed lines).

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Nota

Х Международная конференция им. В.В. Воеводского “Физика и химия элементарных химических про­цессов” (сентябрь 2022, Новосибирск, Россия).


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