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Mechanochemical Synthesis of ZrTiO4 Precursor from Inhomogeneous Mixed Gels

Published online by Cambridge University Press:  21 February 2011

Tetsuhiko isobe ,
Yutaka Okamoto  and
Mamoru Senna
Tetsuhiko isobe
Affiliation:
Faculty of Science and Technology, Keio university, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223,Japan
Yutaka Okamoto
Affiliation:
Faculty of Science and Technology, Keio university, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223,Japan
Mamoru Senna
Affiliation:
Faculty of Science and Technology, Keio university, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223,Japan
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Abstract

Effects of vibration ball-milling of a powdered mixture of two gels, prepared from mixing ZrO2 andTiO2 sols, on crystallization processes during heating are studied in order to elucidate enhanced mechanochemical reactions with the aid of hydroxyl groups. TiO2 (anatase) and ZrO2 (tetragonal) crystallized at 698 K and 712 K, respectively, when heating non-milled gel mixture at 10 K min1 in air. Few reactions between the two phases were detected below 1023 K. After vibro-milling a powdered gel mixture at room temperature for 3 to 30 h, ZrTiO4 (orthorhombic) crystallized directly from non-crystalline precursors on heating to 1023 K. The fraction of crystallizedZrTi04, determined by Raman spectroscopy, increased linearly with increasing the index of micro-homogeneity for non-heated gels. We suggest that short-range ordering of ZrTiO4 rather than crystallization of individual oxides occurs through the non-thermal atomic movement between different metallic species under mechanical stress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 273
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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