{"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":"quali-sono-le-forme-cristalline-dellallumina-in-polvere","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/it\/quali-sono-le-forme-cristalline-dellallumina-in-polvere\/","title":{"rendered":"Quali sono le forme cristalline dell'allumina in polvere?"},"content":{"rendered":"

Le forme cristalline di Al2O3<\/a> sono: \u03b1, \u03b3, \u03b7, \u03b4, \u03b8, \u03ba, \u03c7 e cos\u00ec via. Quando le condizioni esterne cambiano, la forma cristallina cambia. Nella variante Al2O3, poich\u00e9 l'ossigeno in \u03b1-Al2O3 (densit\u00e0 3,99g\/cm3) \u00e8 il pi\u00f9 compatto, solo \u03b1-Al2O3 (corindone) \u00e8 stabile, mentre le altre forme cristalline sono instabili. Trasformato in \u03b1-Al2O3. Oltre al corindone, il tipo di cristallo Al2O3 comune dovrebbe essere \u03b3-Al2O3. Il \u03b3-Al2O3 ha una struttura a spinello, ma nella sua struttura alcuni vuoti tetraedrici non sono riempiti, quindi la densit\u00e0 del \u03b3-Al2O3 (3,65 g\/cm3) \u00e8 inferiore a quella del corindone. Quando l'Al(OH)3 viene riscaldato per la disidratazione, il \u03b3-Al2O3 si forma a circa 450\u00b0C e il \u03b3-Al2O3 viene riscaldato a una temperatura superiore per trasformarsi in corindone. Tuttavia, la velocit\u00e0 di conversione sar\u00e0 pi\u00f9 rapida quando la variazione \u00e8 superiore a 1000?<\/p>\n

Anche altre forme cristalline instabili dell'allumina si formano in condizioni diverse quando l'Al(OH)3 viene riscaldato e disidratato. Il \u03c1-Al2O3 \u00e8 amorfo, ma alcuni pensano che sia uno stato di transizione tra amorfo e cristallino. Poich\u00e9 il \u03c1-Al2O3 \u00e8 l'unica forma di Al2O3 in grado di idratarsi spontaneamente a temperatura ambiente, pu\u00f2 essere utilizzato come agente cementante per i calcestruzzi refrattari, per cui ha ricevuto attenzione negli ultimi anni.<\/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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