Linear and nonlinear dielectric response of vdf60/tr40 copolymer in the vicinity of ferroelectric phase transition

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The effect of the bias electric field E= (0–10 kV/cm) on the dielectric properties of the VDF60/Tr40 copolymer was studied within the temperature range of 20–110°C. It was found that the dielectric nonlinearity De, is negative in the polar phase and becomes positive above the Curie temperature (TC). The increase in TC under the field E= is not uniform. At E= < Ec (Ec is the threshold field), the Curie temperature is practically independent of E=. At E= > Ec, the increase of TC is observed. The presence of the threshold field indicates the presence of sources of random electric fields in the material under study. It is assumed that they are responsible for the smearing of the ferroelectric phase transition.

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作者简介

K. Verkhovskaya

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

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Email: l_korotkov@mail.ru
俄罗斯联邦, Moscow

M. Pankova

Voronezh Institute of the Ministry of Internal Affairs of the Russian Federation

Email: l_korotkov@mail.ru
俄罗斯联邦, Voronezh

I. Popov

Voronezh State Technical University

Email: l_korotkov@mail.ru
俄罗斯联邦, Voronezh

L. Korotkov

Voronezh State Technical University

Email: l_korotkov@mail.ru
俄罗斯联邦, Voronezh

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2. Fig. 1. Temperature dependences of e obtained during heating and cooling of the sample (1), and the dependence of e–1 on temperature (2). Straight lines are drawn in accordance with formulas (1a) and (1b). Insert – dependence of e–1 on (T – Tm)2.

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3. Fig. 2. Temperature dependences of e obtained during heating (1a–3a) and cooling of the sample (1b–3b) at different values ​​of the electric bias field E= 0 (1a and 1b), 7.5 (2a and 2b) and 10 (3a and 3b) kV/cm.

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4. Fig. 3. Dependence De(T) during heating and cooling of the sample.

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5. Fig. 4. Dependences ТСh(E=) (curve 1) and ТСc(E=) (curve 2).

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