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【求助】三氧化二铁的晶体结构求助
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| 请问三氧化二铁是什么类型的晶体结构？另还有a-氧化铁、r-氧化铁和三氧化二铁的区别是什么？各自晶体结构和性质能否提供一些。谢谢 |
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sunxinli(金币+1,VIP+0):认真 11-17 15:17
sunxinli(金币+1,VIP+0):认真 11-17 15:17
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Epsilon phase Rhombic, shows properties intermediate between alpha and gamma. So far has not been prepared in pure form; it is always mixed with the alpha phase or gamma phases. Material with a high proportion of epsilon phase can be prepared by thermal transformation of the gamma phase. The epsilon phase is metastable, transforming to the alpha phase at between 500 and 750 °C. Can also be prepared by oxidation of iron in an electric arc or by sol-gel precipitation from iron(III) nitrate. |
6楼2009-06-16 20:42:22
2楼2009-06-16 20:39:01
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sunxinli(金币+1,VIP+0):认真 11-17 15:17
sunxinli(金币+1,VIP+0):认真 11-17 15:17
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Alpha phase α-Fe2O3 has the rhombohedral, corundum (α-Al2O3) structure and is the most common form. It occurs naturally as the mineral hematite which is mined as the main ore of iron. It is antiferromagnetic below ~260 K (Morin transition temperature), and weak ferromagnetic between 260 K and 950 K (Neel temperature).[1] It is easy to prepare using both thermal decomposition and precipitation in the liquid phase. Its magnetic properties are dependent on many factors, e.g. pressure, particle size, and magnetic field intensity. [ Last edited by queji on 2009-6-16 at 20:47 ] |
3楼2009-06-16 20:39:41
4楼2009-06-16 20:40:58