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- W2324370195 abstract "A magnesium phosphate glass having a molar ratio MgO/P2O5 of about one was prepared. Crystallization temperature of the glass was determined by DTA, which was carried out under various heating atmospheres and heating rates. Isothermal crystallization was examined by polarizing and electron microscopy using a plate-form specimen.In all cases crystallization of magnesium metaphosphate (magnesium tetrametaphosphate) started from the surface of the specimens. This crystallization was found to consist of the following three processes (I), (II) and (III). (I) Polycrystals with radial form grew occasionally at the surface of the glass specimen below about 620°C. (II) Many fine granular crystals with particle size of 1 μ to 6 μ formed at the whole surface of the specimen above about 620°C. (III) At still higher temperatures the growth of the polycrystals occurred from the surface into the inside of the specimen.The crystal growth rate in Process (II) at 640°C and the activation energy for the growth were determined to be 1×10-2μ/min and 110kcal/mol, respectively. White dense products and porous materials were produced in Processes (I) and (III), respectively.The changes in the crystallization and transformation temperatures with the heating atmosphere were discussed on the basis of water in glass structure, in which isolation of the water was related to condensation of the phosphate anions." @default.
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- W2324370195 date "1973-01-01" @default.
- W2324370195 modified "2023-10-05" @default.
- W2324370195 title "Crystallization Process of Magnesium Highpolyphosphate Glass" @default.
- W2324370195 doi "https://doi.org/10.2109/jcersj1950.81.932_127" @default.
- W2324370195 hasPublicationYear "1973" @default.
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