{"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":"quais-sao-as-formas-cristalinas-do-po-de-alumina","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/pt\/quais-sao-as-formas-cristalinas-do-po-de-alumina\/","title":{"rendered":"Quais s\u00e3o as formas cristalinas do p\u00f3 de alumina?"},"content":{"rendered":"

As formas cristalinas de Al2O3<\/a> s\u00e3o: \u03b1, \u03b3, \u03b7, \u03b4, \u03b8, \u03ba, \u03c7 e assim por diante. Quando as condi\u00e7\u00f5es externas mudam, a forma cristalina muda. Na variante Al2O3, uma vez que o oxig\u00e9nio no \u03b1-Al2O3 (densidade 3,99g\/cm3) \u00e9 o mais compacto, apenas o \u03b1-Al2O3 (corindo) \u00e9 est\u00e1vel e as outras formas cristalinas s\u00e3o inst\u00e1veis. Transformado em \u03b1-Al2O3. Al\u00e9m do corindo, o tipo de cristal Al2O3 comum deve ser \u03b3-Al2O3. \u03b3-Al2O3 tem uma estrutura de espin\u00e9lio, mas em sua estrutura, alguns vazios tetra\u00e9dricos n\u00e3o s\u00e3o preenchidos, ent\u00e3o a densidade de \u03b3-Al2O3 (3,65g \/ cm3) \u00e9 menor que o corindo. Quando o Al (OH) 3 \u00e9 aquecido para desidrata\u00e7\u00e3o, o \u03b3-Al2O3 \u00e9 formado a cerca de 450 \u00b0 C e o \u03b3-Al2O3 \u00e9 aquecido a uma temperatura mais alta para se transformar em corindo. No entanto, a velocidade de convers\u00e3o ser\u00e1 mais r\u00e1pida quando a mudan\u00e7a for superior a 1000?<\/p>\n

Algumas outras formas cristalinas inst\u00e1veis de alumina tamb\u00e9m s\u00e3o formadas sob diferentes condi\u00e7\u00f5es quando Al(OH)3 \u00e9 aquecido e desidratado. \u03c1-Al2O3 \u00e9 amorfo, mas algumas pessoas pensam que \u00e9 um estado de transi\u00e7\u00e3o entre amorfo e cristalino. Uma vez que o \u03c1-Al2O3 \u00e9 a \u00fanica forma de Al2O3 que pode hidratar espontaneamente \u00e0 temperatura ambiente, pode ser utilizado como agente de cimenta\u00e7\u00e3o para materiais refract\u00e1rios, pelo que tem recebido aten\u00e7\u00e3o nos \u00faltimos anos.<\/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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