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Titanate Ceramics from Wet-Chemically PreparedPowders

Published online by Cambridge University Press:  21 February 2011

C.H. Lin  and
T.S. Yan
C.H. Lin
Affiliation:
Dept. of Materials Science, National Tsing Hua University, Hsinchu, Taiwan, R.O.C.
T.S. Yan
Affiliation:
Dept. of Materials Science, National Tsing Hua University, Hsinchu, Taiwan, R.O.C.
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Abstract

A simple method of producing very fine, homogeneous BaxSr1-xTiO3 powders wasdeveloped in this study by wet-chemically reacting Ti(0H)4-xH2O, Ba(OH)2, and Sr(OH)2 as raw materials under 100°C. Relationships wereobtained between particle size, composition, and reaction temperatures,reaction tunes, Sr/Ba ratios, and (Ba+Sr)/Ti ratios of the solution.

Experimental results indicated that the particle size, which was around 40nm, was both proportional to the reaction temperature as well as independantof the reaction time. In light of the varying reactivities of Ba and Srtowards Ti, reaction time was found to be a primary factor which controlsthe precise Ba/Sr ratio and (Ba+Sr)/Ti ratio of the titanate powder. Asuitable reaction condition was observed to have prevented by-products Ba6Ti17O40 or Ba2Ti04 from being formed.

The titanate powders were compressed and sintered for various temperatures.The compressibility and the sinterability of the powders were obtained. Themicrostrucure, dielectric constant and dissipation factor of the titanateceramics ware observed and measured. These values sufficiently correlatedwith those of the titanate ceramics produced from the powders by thesolid-state sintering method.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 231
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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