{"id":6646,"date":"2021-04-04T13:05:18","date_gmt":"2021-04-04T13:05:18","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6646"},"modified":"2021-04-12T06:47:20","modified_gmt":"2021-04-12T06:47:20","slug":"jakie-sa-formy-krystaliczne-proszku-tlenku-glinu","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/pl\/jakie-sa-formy-krystaliczne-proszku-tlenku-glinu\/","title":{"rendered":"Jakie s\u0105 formy krystaliczne proszku tlenku glinu?"},"content":{"rendered":"

Formy krystaliczne Al2O3<\/a> s\u0105: \u03b1, \u03b3, \u03b7, \u03b4, \u03b8, \u03ba, \u03c7 i tak dalej. Gdy zmieniaj\u0105 si\u0119 warunki zewn\u0119trzne, zmienia si\u0119 forma krystaliczna. W wariancie Al2O3, poniewa\u017c tlen w \u03b1-Al2O3 (g\u0119sto\u015b\u0107 3,99 g\/cm3) jest najbardziej zwarty, tylko \u03b1-Al2O3 (korund) jest stabilny, a inne formy krystaliczne s\u0105 niestabilne. Przekszta\u0142cony w \u03b1-Al2O3. Opr\u00f3cz korundu, powszechnym typem kryszta\u0142u Al2O3 powinien by\u0107 \u03b3-Al2O3. \u03b3-Al2O3 ma struktur\u0119 spinelu, ale w jego strukturze niekt\u00f3re puste przestrzenie tetraedryczne nie s\u0105 wype\u0142nione, wi\u0119c g\u0119sto\u015b\u0107 \u03b3-Al2O3 (3,65 g\/cm3) jest mniejsza ni\u017c korundu. Gdy Al(OH)3 jest podgrzewany w celu odwodnienia, \u03b3-Al2O3 powstaje w temperaturze oko\u0142o 450\u00b0C, a \u03b3-Al2O3 jest podgrzewany do wy\u017cszej temperatury, aby przekszta\u0142ci\u0107 si\u0119 w korund. Jednak szybko\u015b\u0107 konwersji b\u0119dzie szybsza, gdy zmiana b\u0119dzie wi\u0119ksza ni\u017c 1000?<\/p>\n

Niekt\u00f3re inne niestabilne formy krystaliczne tlenku glinu powstaj\u0105 r\u00f3wnie\u017c w r\u00f3\u017cnych warunkach, gdy Al(OH)3 jest podgrzewany i odwadniany. \u03c1-Al2O3 jest amorficzny, ale niekt\u00f3rzy uwa\u017caj\u0105, \u017ce jest to stan przej\u015bciowy mi\u0119dzy amorficznym a krystalicznym. Poniewa\u017c \u03c1-Al2O3 jest jedyn\u0105 form\u0105 Al2O3, kt\u00f3ra mo\u017ce spontanicznie hydratowa\u0107 w temperaturze pokojowej, mo\u017ce by\u0107 stosowany jako \u015brodek cementuj\u0105cy do ogniotrwa\u0142ych materia\u0142\u00f3w odlewniczych, dlatego w ostatnich latach zwr\u00f3cono na niego uwag\u0119.<\/p>","protected":false},"excerpt":{"rendered":"

The crystal forms of Al2O3 are: \u03b1, \u03b3, \u03b7, \u03b4, \u03b8, \u03ba, \u03c7 and so on. When the external conditions change, the crystal form will change. In the Al2O3 variant, since the oxygen in \u03b1-Al2O3 (density 3.99g\/cm3) is the most compactly packed, only \u03b1-Al2O3 (corundum) is stable, and other crystal forms are unstable. Transformed into 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