Effect of Internal Stress on the Strength of BaTiO3
- 1 January 1976
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 59 (1-2) , 71-74
- https://doi.org/10.1111/j.1151-2916.1976.tb09394.x
Abstract
The strength of BaTiO3 which had been hot‐pressed to ∼99% of theoretical density and tested above the Curie temperature was—9000 psi greater than at room temperature. This measured difference in strength is attributed to internal stress from the cubic→tetragonal phase transformation. Correction of measured strength to zero porosity predicts internal stresses of ∼11,000 psi, in good agreement with the dielectric theory for fine‐grain BaTiO3. The internal stress is nearly independent of grain size in the range ∼1.5 to 150 μm, showing that 90° domains do not reduce internal stresses causing failure. Lower internal stress in commercial BaTiO3 is attributed to greater porosity, large flaw sizes, and possibly the effects of additives.Keywords
This publication has 4 references indexed in Scilit:
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