CrO_3熱分解反応におけるHCrO_2種子結晶, 水, 酸素圧の影響

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With DTA, TGA and X-ray diffraction analysis of the phases obtained in a closed vessel in the temperature range 300-600°C, it was postulated that the dissociation sequence of chromium trioxide into intermediate chromium oxides was CrO3→Cr3O8→X-phase→Cr2O5→CrO2→Cr2O3. Although the X-phase was not characterized enough, it was considered to be a new intermediate phase (Cr:O=1:2.49) different from Cr2O5.Seed crystal (HCrO2), water and oxygen pressure had effects on the reaction. With water, phase of Cr2O5 was stabilized At elevated oxygen pressure beforehand (up to 10kg/cm2), phase of Cr3O8 was stabilized and formation of Cr2O3 was retarded.Adding HCrO2 for seed crystals gave rise to change in the reaction sequence, the sequence being CrO3→Cr2O5→CrO2→Cr2O3. Further, seed crystals decreased the effects of water and oxygen pressure on the reaction.
社団法人日本セラミックス協会の論文
1976-09-01