Electrical-field induced nonlinear conductive behavior in dense zirconia ceramic

doi:10.1016/j.jmst.2017.03.005

Abstract

Abstract:

The effect of the applied electric field on the conductive behavior of zirconia ceramics is studied by measuring its initial current-voltage curve at various temperatures. The results show that when the field strength is higher than the threshold for flash-sintering, the curves exhibit a nonlinear behavior by having an additional current on top of the linear current according to Ohm’s law. Analyzing its transport behavior reveals that the additional current density is due to the extra oxygen vacancies induced by the electric field. The formation rate of the extra vacancies and associated current was related to the field strength.

Key words: Flash sintering, Non-linear conductivity, Zirconia, Electric field effect

Gao Yan, Liu Fangzhou, Liu Dianguang, Liu Jinling, Wang Yiguang, An Linan. Electrical-field induced nonlinear conductive behavior in dense zirconia ceramic[J]. J. Mater. Sci. Technol., 2017, 33(8): 897-900.

Figures/Tables 5

Fig 1. Current density as a function of time measured at 800 °C and different electric field strengths as labeled.

Fig. 2. A typical plot of the initial current density as a function of applied electric field strength for the data experimentally measured at 600 °C (open points), and the data calculated from Eq. (1a) (green line), (1b) (red line) and (1c) (blue line) as labeled.

Table 1 Parameters obtained by curve-fitting the experimental data in Fig. 2(a) using Eq. (1).

Temperature (°C)	400	500	600	700	800
α (s/m)	0.01	0.07	0.31	0.78	1.7
β (s/V)	9.0E-5	7.8E-4	5.8E-3	3.0E-2	8.6E-2
E_c (V/mm)	6	3.3	2	1.5	1.1

Fig. 3. Comparing the directly-measured conductivity (open triangles) with the α (open circles).

Fig. 4. Plots of ln(βΤ) (a) and ln(Ec) (b) versus 1/T.

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