Features of interpretation of pulsed radiation-induced conductivity of polymers at low temperature

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The pulsed radiation-induced conductivity of polyethylene and polypropylene was studied at low (about 100 K) temperatures under the influence of electron pulses with an energy of 50 keV and a duration of 1 ms. To explain the results obtained, the Rose-Fowler-Vaisberg model was used. It is shown that when using it, it is necessary to take into account the difference in the shifts of carriers in a unit electric field before the first trapрing (μ-0τ-0) and those moving by recapture along traps (μ0τ0) appearing in the theoretical Rose–Fowler–Vaisberg model. Both of these parameters were calculated based on the results of experimental results.

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I. Mullakhmetov

National Research University Higher School of Economics

编辑信件的主要联系方式.
Email: sseew111@gmail.com

Tikhonov Moscow Institute of Electronics and Mathematics

俄罗斯联邦, Moscow

V. Saenko

National Research University Higher School of Economics

Email: sseew111@gmail.com

Tikhonov Moscow Institute of Electronics and Mathematics

俄罗斯联邦, Moscow

A. Tyutnev

National Research University Higher School of Economics

Email: sseew111@gmail.com

Tikhonov Moscow Institute of Electronics and Mathematics

俄罗斯联邦, Moscow

E. Pozhidaev

National Research University Higher School of Economics

Email: sseew111@gmail.com

Tikhonov Moscow Institute of Electronics and Mathematics

俄罗斯联邦, Moscow

参考

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2. Fig. 1. Experimental (1) and calculated (2) radiation-pulse conductivity of LDPE at 103 K and dose rate of 2.1 ∙ 104 Gy/s.

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3. Fig. 2. Experimental (1) and calculated (2) radiation-pulse electrical conductivity of PP at 103 K and dose rate of 1.7 ∙ 104 Gy/s.

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4. Fig. 3. Experimental (1, black, Kr /Kp ratio is plotted on the ordinate axis) and calculated (2, Kr /Kp′ ratio is plotted on the ordinate axis) RIE curves of LDPE at 298 K and a dose rate of 6.2 ∙ 105 Gy/s. Curve 2 practically coincides with curve 1, which sharply decreases to zero at t ≤ 0.4 μs (shown by the dashed line) due to the influence of methodological factors (measurement time constant, inertia of the electronic system, etc.). The electron pulse duration is 20 µs. The calculated curve (3, blue) was calculated for the parameter -m0-t0 = 1.9 - 10-16 m2/V (Table 2).

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5. Fig. 4. Experimental (black) and calculated curves (1-5) demonstrating the method of fitting the frequency factor on the example of LDPE (normalized to the value of jrd at the end of the radiation pulse). The temperature is room temperature, the pulse duration is 20 µs. The frequency factor values are 107 (1), 106 (2), 6 ∙ 105 (3), 2 ∙ 105 (4), and 8 ∙ 104 s-1 (5).

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6. Fig. 5. Experimental (1) and calculated (2, 3) RIE curves of PP at 298 K and dose rate of 1.7 ∙ 104 Gy/s. For curve 2 the parameter dd1 = 0.1, for curve 3 it is equal to 0.07 (shown by arrows).

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