Sol-gel process doped ZnO nanopowders and their grain growth

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(97)00091-3· OSTI ID:532908

Xueya, Kang; Tiandiao, Wang; Yin, Han; Minde, Tao ^[1]; Mingjing, Tu ^[2]

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1. Chinese Academy of Sciences, Urumuqi (China). Xing Jiang Inst. of Physics
2. Sichuan Unite Univ., Chendu (China). Dept. of Materials Engineering

The doped ZnO nanoparticles are prepared by a sol-gel method. These ZnO nanoparticles provide ZnO-based ceramic varistors displaying superior varistor properties--higher value of the nonlinear coefficient, lower leakage current, and higher critical electric field values--as compared to those of conventional samples. The present work has been aimed at studying the effect of processing variables such as sintering temperature and duration on the microstructure and grain growth of ZnO-Bi{sub 2}O{sub 3}-Sb{sub 2}O{sub 3}-MnO{sub 2}-Co{sub 2}O{sub 3}-Al{sub 2}O{sub 3} ceramics. The activation energy calculated is found to be 364 {+-} 24 KJ/mol for Bi{sub 2}O{sub 3}-Sb{sub 2}O{sub 3}-MnO{sub 2}-Co{sub 2}O{sub 3}-Al{sub 2}O{sub 3} doped ZnO. All these advantages are due to greater structural homogeneity, smaller particle size, higher surface area, and higher density of the doped ZnO nanoparticles which are precursors for ZnO varistors, as compared to coarser particles for making varistors.

• OSTI ID: 532908
• Journal Information: Materials Research Bulletin, Vol. 32, Issue 9; Other Information: PBD: Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN GROWTH
SOL-GEL PROCESS
ZINC OXIDES
DOPED MATERIALS
ACTIVATION ENERGY
PARTICLE SIZE
SURFACE AREA
BULK DENSITY