Effect of Heating and Cooling Rates on Microstructure of ZnO-CoO-SLS Based Varistor Ceramics

Authors

  • Nur Quratul Aini Ismail Department of Physics, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia Author
  • Nor Kamilah Sa’at Department of Physics, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia Author
  • Mohd Hafiz Mohd Zaid Department of Physics, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia Author

Keywords:

Heating and cooling rates, average grain size, grain boundaries, SLS glass, varistor

Abstract

In this research, ZnO-CoO doped with fixed 2 mol% SLS glass based varistor ceramics are produce by using solid state method sintered at 1100 ̊C for 2 hours. The investigation regarding to the varying heating and cooling rates from 4 to 8 ̊C/min is discussed. XRD and SEM attached with EDX analyses showed that the main phase was ZnO and Zn2SiO4 as the secondary phases distributed at grain boundaries. Average grain size increased from 24.41 to 27.39μm as increase in heating cooling rates from 4 to 6 ̊C/min. However, the increase of heating cooling rates up to 8 ̊C/min the average grain size decrease to 25.52μm. The average density, p of the sample is decrease from 5.39 to 5.20 g/cm3 as increase the heating and cooling rates from 4 to 8 ̊C/min.

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Published

2026-01-06

Issue

Vol. 22 No. 1&2 (2021): Journal of Solid State Science and Technology Letters

Section

Articles