Abstract
A comparative study has been made of the processes involved in the consolidation of nanosized barium titanate powders by nonisothermal sintering at a linear heating rate, by rate-controlled sintering, and high-pressure sintering (up to 5 GPa). The use of linear heating and high-pressure has been found to be ineffective for obtaining nonporous ceramics (residual porosity of about 2%) and for miniziming grain growth. The application of external pressure does not prevent coalescent grain growth controlled by surface diffusion. When rate-controlled sintering is employed a densification/grain growth optimum can be attained with a relative density of 99.9% of the theoretical value and a grain size of about 100 nm.
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Ragulya, A.V., Skorokhod, V.V. Synthesis and Sintering of Nanocrystalline Barium Titanate Powder under Nonisothermal Conditions. Part V. Nonisothermal Sintering of Barium Titanate Powders of Different Dispersion. Powder Metallurgy and Metal Ceramics 39, 395–402 (2000). https://doi.org/10.1023/A:1026669724386
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DOI: https://doi.org/10.1023/A:1026669724386