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Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare; and iron(II,III) oxide (Fe3O4), which also occurs naturally as the mineral magnetite. As the mineral known as hematite, Fe2O3 is the main source of iron for the steel industry. Fe2O3 is readily attacked by acids. Iron(III) oxide is often called rust, and to some extent this label is useful, because rust shares several properties and has a similar composition; however, in chemistry, rust is considered an ill-defined material, described as Hydrous ferric oxide.[11]
Quick Facts Iron(III) oxide, 识别 ...
Iron(III) oxide | |
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IUPAC名 Iron(III) oxide | |
别名 | ferric oxide, haematite, ferric iron, red iron oxide, rouge, maghemite, colcothar, iron sesquioxide, rust, ochre |
识别 | |
CAS号 | 1309-37-1 ![]() |
PubChem | 518696 |
ChemSpider | 14147 |
SMILES |
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InChI |
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InChIKey | JEIPFZHSYJVQDO-ZVGCCQCPAC |
Gmelin | 11092 |
ChEBI | 50819 |
RTECS | NO7400000 |
KEGG | C19424 |
性质 | |
化学式 | Fe2O3 |
摩尔质量 | 159.69 g·mol−1 |
外观 | Red-brown solid |
气味 | Odorless |
密度 | 5.25 g/cm3[1] |
熔点 | 1539 °C(1812 K) |
溶解性(水) | Insoluble |
溶解性 | Soluble in diluted acids,[1] barely soluble in sugar solution[2] Trihydrate slightly soluble in aq. tartaric acid, citric acid, CH3COOH[3] |
磁化率 | +3586.0x10−6 cm3/mol |
折光度n D |
n1 = 2.91, n2 = 3.19 (α, hematite)[4] |
结构 | |
晶体结构 | Rhombohedral, hR30 (α-form)[5] Cubic bixbyite, cI80 (β-form) Cubic spinel (γ-form) Orthorhombic (ε-form)[6] |
空间群 | R3c, No. 161 (α-form)[5] Ia3, No. 206 (β-form) Pna21, No. 33 (ε-form)[6] |
配位几何 | Octahedral (Fe3+, α-form, β-form)[5] |
热力学 | |
ΔfHm⦵298K | −824.2 kJ/mol[7] |
S⦵298K | 87.4 J/mol·K[7] |
热容 | 103.9 J/mol·K[7] |
危险性 | |
GHS危险性符号![]() | |
GHS提示词 | Warning |
H-术语 | H315, H319, H335[8] |
P-术语 | P261, P305+351+338[8] |
NFPA 704 | |
PEL | TWA 10 mg/m3[9] |
TLV | {{{TLV}}}, 5 mg/m3[1] (TWA) |
致死量或浓度: | |
LD50(中位剂量)
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10 g/kg (rats, oral)[10] |
相关物质 | |
其他阴离子 | Iron(III) fluoride |
其他阳离子 | Manganese(III) oxide Cobalt(III) oxide |
相关化合物 | Iron(II) oxide Iron(II,III) oxide |
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。 |
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![Vial with iron(III) oxide](http://upload.wikimedia.org/wikipedia/commons/thumb/1/18/%D0%96%D0%B5%D0%BB%D0%B5%D0%B7%D0%BD%D1%8B%D0%B9_%D1%81%D1%83%D1%80%D0%B8%D0%BA.jpg/640px-%D0%96%D0%B5%D0%BB%D0%B5%D0%B7%D0%BD%D1%8B%D0%B9_%D1%81%D1%83%D1%80%D0%B8%D0%BA.jpg)