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- W60019269 abstract "The technological properties of powders of rare-earth oxides are determined to a considerable extent by the perfection of their crystal structure formed during heat treatment. Because of their high binding energy, rare-earth oxides are classified as high-melting substances, and the processes of recrystallization and coalescence of the grains in them take place according to a diffusion mechanism at high technological temperatures. In the case of a solid solution of rare-earth oxides based on cerium dioxide, for example, recrystallization takes place fairly intensely at 1000-1100/sup 0/C. Theoretically it is best to carry out the heat treatment of powders and articles made from them at the lowest possible temperature. As we know, the effect of lowering the temperature can be achieved by introducing additions which lower the diffusional resistance of the main substance into the original material. In the present work we investigated the activation of structure formation by alkali metal fluorides in a solid solution of rare-earth oxides based on cerium dioxide, which was obtained by thermolysis of coprecipitated rare-earth carbonates. The selection of metal fluorides as activators was due to their use as catalysts in solid-phase thermal reactions of rare-earth oxides without high-melting oxides." @default.
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- W60019269 date "1981-11-01" @default.
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- W60019269 title "Activation of the thermal structure formation of rare-earth oxides by metal fluorides" @default.
- W60019269 hasPublicationYear "1981" @default.
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