Polarization relaxation in zinc oxide varistors from 77 K to 450 K

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Description

The time and temperature dependences of polarization currents are investigated to higher temperatures and with greater temperature resolution than has been reported previously for zinc oxide varistors. Arrhenius plots yield thermal activation energies near 140 and 8 meV, which are in reasonable agreement with values reported recently, as well as an additional thermally activated level at 0.66 eV, which emerges in the extension of the measurements to T > 300K. Conductance data in this higher temperature range for the same samples yield the nearly identical energy of 0.68 eV for the intergranular (Schottky) barrier height. The temperature dependence of the ... continued below

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13 p.

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Major, R.W.; Werner, A.E.; Wilson, C.B. & Modine, F.A. October 1, 1994.

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Description

The time and temperature dependences of polarization currents are investigated to higher temperatures and with greater temperature resolution than has been reported previously for zinc oxide varistors. Arrhenius plots yield thermal activation energies near 140 and 8 meV, which are in reasonable agreement with values reported recently, as well as an additional thermally activated level at 0.66 eV, which emerges in the extension of the measurements to T > 300K. Conductance data in this higher temperature range for the same samples yield the nearly identical energy of 0.68 eV for the intergranular (Schottky) barrier height. The temperature dependence of the exponent m in the power-law expression for the current-time dependence I = I{sub o}t{sup {minus}m} was carefully examined and found to change twice from 0.5 to 1.0. The non-monotonic behavior of m with temperature is interpreted as due to resolution of the polarization currents from two different traps each of which makes the transition from diffusive to dispersive transport as temperature is lowered rather than, for example, a complicated distribution of relaxation times.

Physical Description

13 p.

Notes

OSTI as DE95007761

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  • 96. annual meeting of the American Ceramic Society (ACS), Indianapolis, IN (United States), 25-28 Apr 1994

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  • Other: DE95007761
  • Report No.: CONF-940416--33
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/28384 | External Link
  • Office of Scientific & Technical Information Report Number: 28384
  • Archival Resource Key: ark:/67531/metadc664370

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  • October 1, 1994

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • Jan. 20, 2016, 12:02 p.m.

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Major, R.W.; Werner, A.E.; Wilson, C.B. & Modine, F.A. Polarization relaxation in zinc oxide varistors from 77 K to 450 K, report, October 1, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc664370/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.