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      Control of Liquid Film Migration in Strontium Titanate

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      https://www.riss.kr/link?id=E805444

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      When an oxide melt is infiltrated into sintered SrTiO_(3), the liquid films formed between SrTiO_(3) grains are often observed to migrate. This paper reviews some recent experimental results on the liquid film migration. The major experimental parameters for the migration control have been found to be the solute species during infiltration and the oxygen partial pressure during sintering and infiltration. In particular, the difference in oxygen potential at the interface of SrTiO_(3) grains with infiltrated liquid played the major role during the processing. Measuring the migration distance in function of estimated coherency strain, it has been shown that the driving force for the migration was the coherency strain energy stored in a thin diffusional layer on receding grains due to lattice parameter change either by solute diffusion or by defect concentration change. The effect of the liquid film migration on dielectric properties has also been presented.
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      When an oxide melt is infiltrated into sintered SrTiO_(3), the liquid films formed between SrTiO_(3) grains are often observed to migrate. This paper reviews some recent experimental results on the liquid film migration. The major experimental paramet...

      When an oxide melt is infiltrated into sintered SrTiO_(3), the liquid films formed between SrTiO_(3) grains are often observed to migrate. This paper reviews some recent experimental results on the liquid film migration. The major experimental parameters for the migration control have been found to be the solute species during infiltration and the oxygen partial pressure during sintering and infiltration. In particular, the difference in oxygen potential at the interface of SrTiO_(3) grains with infiltrated liquid played the major role during the processing. Measuring the migration distance in function of estimated coherency strain, it has been shown that the driving force for the migration was the coherency strain energy stored in a thin diffusional layer on receding grains due to lattice parameter change either by solute diffusion or by defect concentration change. The effect of the liquid film migration on dielectric properties has also been presented.

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      목차 (Table of Contents)

      • 1. INTRODUCTION
      • 2. THE DIFFUSIONAL COHERENCY STRAIN THEORY
      • 3. EFFECT OF SOLUTE SPECIES
      • 4. EFFECT OF ATMOSPHERE (OXYGEN PARTIAL PRESSURE)
      • 5. MICROSTRUCTURE CONTROL AND DIELECTRIC PROPERTIES
      • 1. INTRODUCTION
      • 2. THE DIFFUSIONAL COHERENCY STRAIN THEORY
      • 3. EFFECT OF SOLUTE SPECIES
      • 4. EFFECT OF ATMOSPHERE (OXYGEN PARTIAL PRESSURE)
      • 5. MICROSTRUCTURE CONTROL AND DIELECTRIC PROPERTIES
      • 6. CONCLUSIONS
      • REFERENCES
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