Effect of powder bed on the microstructure and electrical properties of Bi2O3- and Sb2O3-doped ZnO |
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Authors: | Yeh-Wu Lao Shu-Ting Kuo Wei-Hsing Tuan |
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Affiliation: | (1) Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan |
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Abstract: | The effects of powder bed on the microstructure and electrical properties of Bi2O3- and Sb2O3-doped ZnO specimens are investigated in the present study. By using a sufficient amount of powder bed, the weight loss of Bi2O3 reduces from >95 to <20%. The reduction of weight loss enhances significantly the densification and grain growth of ZnO. Furthermore, the use of powder bed can also reduce the size distribution of ZnO grains. Nevertheless, the presence of Bi2O3 residue results in the formation of a pyrochlore phase (Zn2Bi3Sb3O14) during the cooling down stage; its presence is detrimental to the nonlinear characteristics of ZnO–Bi2O3–Sb2O3 system. |
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