Effect of La2O3 Dopant on Microstructure and Electrical Nonlinearity of ZnO-CaMnO3 Based Varistor Ceramics

International Fundamentum Science Symposium 2018

自然科学;工业技术

Ghazali, Mohd Sabri Mohd^1,2 ; Shukri, Norazwa Mohd^3 ; Abdullah, Wan Rafizah Wan^3 ; Zulkifli, Muhamad Azman^1 ; Jew, Lee Oon^1 ; Rizwan, Zahid^4

Advanced Nano Materials (ANoMa) Research Group, Nano Research Team, School of Fundamental Science, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu

21030, Malaysia^1

Institute of Tropical Biodiversity and Sustainable Development, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu

21030, Malaysia^2

School of Ocean Engineering, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu

21030, Malaysia^3

Department of Applied Sciences, Convener Purchase, National Textile University, Faisalabad

37610, Pakistan^4

关键词: Citrate gel method;    Distribution of element;    Electrical nonlinearity;    Linearity coefficient;    Oxide-based varistors;    Sintering condition;    Sintering temperatures;    Solid state method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/440/1/012031/pdf
DOI  :  10.1088/1757-899X/440/1/012031

来源: IOP

【 摘 要 】

In this research, zinc oxide based varistor are produce by using citrate-gel method compared to conventional solid-state method. The zinc oxide based varistor are fabricate using three different wt.% of ZnO-CaMnO3-La2O3 and divided into three system which are 80 mol% ZnO + 20 mol% CaMnO3, 79.5 mol% ZnO + 20 mol% CaMnO3 + 0.5 mol% La2O3 and 78.5 mol% ZnO + 20 mol% CaMnO3 + 1.5 mol% La2O3. ZnO-CaMnO3-La2O3 compound experienced pre-sintering at 500 °C for 2 hours sintering time. In the sintering condition, sintering temperatures are manipulated, which are varied at 1100, 1200 and 1300 °C while, the sintering time is setting at 4.5 hours. X-ray diffraction patterns show this compound is high in crystallinity. The surface morphology with the average grains size between 2.0 ∼ 10.0 μm was observed by Scanning Electron Microscopy. Energy Dispersive Spectroscopy confirmed that distribution of element are homogenous with high purity. Density of the sample product is range between 5.0 ∼ 5.6 g cm-3. J-E characteristic shows the value of non-linearity coefficient in the range of 1.10 to 4.35.