Effect of PbTiO3 Addition in Grain Growth and Microstuctural Evolution of BaTiO3

다국어 초록 (Multilingual Abstract)

Chemically induced grain boundary migration (CIGM) and its ellect on grain growth and microstructure development of BaTiO_(3) have been studied.When sintered BaTiO_(3) specimens, of two different grain sizes were annealed in contact with PbTiO_(3), particles at 1250℃, CIGM occurred in the specimen with coarse grains (∼200㎛), but fast growth of BaTiO_(3)grains occurred in the specimen with fine grains (∼4㎛). EDS analysis confirmed that the observed microstructural changes were related to CIGM, of which the driving force is the coherent strain energy built in a thin coherent diffusion layer on a recing grain The coherent strain energy in the BaTiO_(3)-PbTiO_(3) system was calculated using a previously derived general equation and compared with capillary energy. The calculated strain energy was much higher than the capillary energy, for grains larger than a few tenths of microns. It appears that the total driving force for grain growth under CIGM conditions is the sum of the coherent strain energy clue to solute diffusion and the capillary energy due to grain boundary curvature. The present result suggests that CIGM may induce abnormal grain growth.

목차 (Table of Contents)

• 1.0 INTRODUCTION
• 2.0 GENERAL EQUATION OF COHERENT STRAIN ENERGY
• 3.0 THE EFFECT OF COHERENT STRAIN ENERGY ON GRAIN GROWTH IN BaTiO_(3)PbTiO_(3)
• 3.1 CALCULATION OF COHERENT STRAIN ENERGY FOR THE BaTiO_(3)PbTiO_(3), SYSTEM
• 3.2 EXPERIMENTAL PROCEDURE
• 3.3 EXPERIMENTAL RESULTS AND DISCUSSION
• 4.0 SUMMARY
• 5.0 ACKNOWLEDGMENT
• 6.0 REFERENCES