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- W2790669757 abstract "Abstract Semi-finished Ce-La extracts of a local Rare Earth (RE) ore refining factory were heat-decomposed to oxides and used as the sole RE source to fabricate high-performance ZnO-V2O5-MnCO3-Nb2O5 (ZnVMnNbO) varistor ceramics. The effect of varying the concentration of this RE dopant within the range of 0–0.25 mol% on the microstructure and nonlinearity of the ceramic sintered at 850–950 °C was studied by XRD, SEM, EDS, EBSD and I-V test. Besides of ZnO main phase, Ce(La)VO4 solid solution and ZnMn2O4 were identified as the minor secondary phases along with ZnV2O4, Zn3(VO4)2. The average ZnO grain size decreased from 6.35 to 3.37 µm in the ceramic samples sintered at 900 °C with the increase of Ce-La dopant from 0 to 0.25 mol%. The breakdown field was thereby elevated from 3320 to 5590 V/cm and the homogeneity of the obtained microstructure was enhanced as well. Only 0.1 mol% of such Ce-La dopant was sufficient to improve the nonlinear coefficient of the ZnVMnNbO based varistor ceramics sintered at 875 °C to 48.4. The further addition of the RE dopant or the increase of sintering temperature from 875 °C to 950 °C all decreased the nonlinearity. In general, our result indicated the semi-finished Ce-La extracts can be a feasible and effective candidate to replace pure RE oxides for fabricating high-performance ZnO based varistor ceramics at a lower cost." @default.
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- W2790669757 date "2018-04-01" @default.
- W2790669757 modified "2023-09-24" @default.
- W2790669757 title "Using semi-finished Ce-La extracts as the sole RE source to synthesize high-performance ZnVMnNbO varistor ceramics" @default.
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- W2790669757 doi "https://doi.org/10.1016/j.ceramint.2018.01.117" @default.
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