Effect of silica doping on the densification and grain growth in zinc oxide

2011 ◽  
Vol 37 (7) ◽  
pp. 2679-2687 ◽  
Author(s):  
Tapatee Kundu Roy ◽  
Abhijit Ghosh ◽  
Debasis Bhowmick ◽  
Dirtha Sanyal ◽  
Soumyajit Koley ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Grain Growth ◽  
Silica Doping

Nanostructure Evolution of ZnO in Ultra-fast Microwave Sintering

2011 ◽  
Vol 691 ◽  
pp. 65-71 ◽  
Author(s):  
Rodolfo F. K. Gunnewiek ◽  
Ruth Herta Goldsmith Aliaga Kiminami
Keyword(s):  
Grain Size ◽  
Zinc Oxide ◽  
Grain Growth ◽  
Microwave Sintering ◽  
High Heating Rate ◽  
Heating Rates ◽  
Grain Sizes ◽  
Average Grain Size ◽  
Conventional Sintering ◽  
Holding Temperature

Grain growth is inevitable in the sintering of pure nanopowder zinc oxide. Sintering depend on diffusion kinetics, thus this growth could be controlled by ultra-fast sintering techniques, as microwave sintering. The purpose of this work was to investigate the nanostructural evolution of zinc oxide nanopowder compacts (average grain size of 80 nm) subjected to ultra-rapid microwave sintering at a constant holding temperature of 900°C, applying different heating rates and temperature holding times. Fine dense microstructures were obtained, with controlled grain growth (grain size from 200 to 450nm at high heating rate) when compared to those obtained by conventional sintering (grain size around 1.13µm), which leads to excessively large average final grain sizes.

FAST/SPS sintering of nanocrystalline zinc oxide—Part II: Abnormal grain growth, texture and grain anisotropy

2016 ◽  
Vol 36 (5) ◽  
pp. 1221-1232 ◽  
Author(s):  
Benjamin Dargatz ◽  
Jesus Gonzalez-Julian ◽  
Martin Bram ◽  
Yutaka Shinoda ◽  
Fumihiro Wakai ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Nanocrystalline Zinc Oxide ◽  
Sps Sintering

Grain Growth Control in Sb2O3-Doped Zinc Oxide

2003 ◽  
Vol 86 (8) ◽  
pp. 1379-1384 ◽  
Author(s):  
Nina Daneu ◽  
Aleksander Rečnik ◽  
Slavko Bernik
Keyword(s):  
Zinc Oxide ◽  
Grain Growth ◽  
Growth Control

High Barrier Effects of (0001)|(0001) Zinc Oxide Bicrystals: Implication for Varistor Ceramics with Inversion Boundaries

2005 ◽  
Vol 20 (8) ◽  
pp. 2101-2109 ◽  
Author(s):  
Jong-Sook Lee ◽  
Joachim Maier
Keyword(s):  
Zinc Oxide ◽  
Grain Boundaries ◽  
Grain Growth ◽  
Growth Behavior ◽  
Impurity Effects ◽  
Barrier Effects ◽  
Zno Varistor ◽  
Grain Growth Behavior ◽  
Superior Property ◽  
Strong Barrier

Inversion boundaries (IBs) of a head-to-head or (0001)|(0001) (C+|C+) configuration bisect virtually every grain in typical commercial ZnO varistor ceramics. They are most often considered electrically inactive, and the effect on the grain growth behavior has been recently addressed. In this work, various configurations of ZnO bicrystals were prepared using different source crystals and strong barrier effects were observed in some (0001)|(0001) (C−|C−) bicrystals using crystals with higher impurity contents. The crystallographic polarity and impurity effects were systematically examined by doping C+|C+ and C−|C− bicrystals with single and double additives of Mn, Co, Ni, and Bi. Varying degrees of barrier effects including varistor-like behaviors were observed in C−|C− bicrystals depending on dopants, while C+|C+ bicrystals consistently exhibited negligible effects. Because the IBs in ZnO varistor ceramics preferentially expose C− surfaces in the grain boundaries, the superior property of commercial ZnO varistor ceramics is suggested to be assisted by the presence of IBs.

scholarly journals Study of Large-Scale Aluminium-Doped Zinc Oxide Ceramic Targets Prepared by Slip Casting

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Ling-yun Han ◽  
Yong-chun Shu
Keyword(s):  
Zinc Oxide ◽  
Electrical Properties ◽  
Grain Growth ◽  
Large Scale ◽  
Slip Casting ◽  
Visible Region ◽  
Oxide Ceramic ◽  
Maximum Value ◽  
Average Transmittance ◽  
Ceramic Targets

Aluminium-doped zinc oxide (AZO) ceramic green compacts at a size of 170 × 340 × 17 mm have been prepared by slip casting. An AZO slurry with good fluidity and viscosity was obtained when 1.2 wt% of dispersant was added, which indicates that the slurry prepared with micrometre particles is more suitable for slip casting. The densification and electrical properties of the AZO targets prepared by particles with different sizes were investigated after sintering from 1380 to 1460°C. The results showed that the relative density of the AZO target prepared with 45 nm particles could reach nearly 98% at 1380°C; the resistivity of the AZO target prepared with nanometre particles could be as low as 1.6 × 10−3 Ω·cm at 1400°C; and the average transmittance of the AZO film prepared with nanometre particles could reach a maximum value of 93.73% in the visible region at 250 W. In this study, the correlation between the density, resistivity, and grain growth of AZO ceramic green compacts was studied.

Grain Growth in Zinc Oxide

1965 ◽  
Vol 48 (4) ◽  
pp. 214-215 ◽  
Author(s):  
G. C. NICHOLSON
Keyword(s):  
Zinc Oxide ◽  
Grain Growth
Sign in / Sign up

Export Citation Format

Share Document