Demir(III) oksit

Demir(III) oksit
Haematite unit cell
  Fe   O
Pourbaix Diyagramı
Adlandırmalar
ferrik oksit, hamatit, ferrik demir, kırmızı demir oksit, maghemit, colcothar, pas
Tanımlayıcılar
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.790 Bunu Vikiveri'de düzenleyin
EC Numarası
  • 215-168-2
E numaraları E172(ii) (renkler)
11092
KEGG
RTECS numarası
  • NO7400000
UNII
  • InChI=1S/2Fe.3O [inchi]
    Key: JEIPFZHSYJVQDO-UHFFFAOYSA-N [inchi]
  • InChI=1/2Fe.3O/rFe2O3/c3-1-4-2(3)5-1
    Key: JEIPFZHSYJVQDO-ZVGCCQCPAC
  • O1[Fe]2O[Fe]1O2
Özellikler
Kimyasal formül Fe2O3
Molekül kütlesi 159,69 g mol−1
Görünüm kırmızı katı
Koku kokusu
Yoğunluk 5,25 g/cm3[1]
Erime noktası 1.539 °C (2.802 °F; 1.812 K)[1]
bozunur
105 °C (221 °F; 378 K)
β-dihydrate, decomposes
150 °C (302 °F; 423 K)
β-monohydrate, decomposes
50 °C (122 °F; 323 K)
α-dihydrate, decomposes
92 °C (198 °F; 365 K)
α-monohydrate, decomposes[2]
Çözünürlük (su içinde) Insoluble
Çözünürlük Soluble in diluted acids,[1] barely soluble in sugar solution[2]
Trihydrate slightly soluble in aq. tartaric acid, citric acid, acetic acid[2]
+3586.0x10−6 cm3/mol
Kırınım dizimi (nD) n1 = 2.91, n2 = 3.19 (α, hematite)[3]
Yapı
Rhombohedral, hR30 (α-form)[4]
Cubic bixbyite, cI80 (β-form)
Cubic spinel (γ-form)
Orthorhombic (ε-form)[5]
R3c, No. 161 (α-form)[4]
Ia3, No. 206 (β-form)
Pna21, No. 33 (ε-form)[5]
3m (α-form)[4]
2/m 3 (β-form)
mm2 (ε-form)[5]
Octakedral (Fe3+, α-form, β-form)[4]
Termokimya[6]
103.9 J/mol·K[6]
Standart molar entropi (S298)
87.4 J/mol·K[6]
Standart formasyon entalpisi fH298)
−824.2 kJ/mol[6]
Gibbs serbest enerjisi fG)
−742.2 kJ/mol[6]
Tehlikeler
GHS etiketleme sistemi:
Piktogramlar GHS07: Zararlı[7]
İşaret sözcüğü Warning
Tehlike ifadeleri H315, H319, H335[7]
Önlem ifadeleri P261, P305+P351+P338[7]
NFPA 704
(yangın karosu)
NFPA 704 four-colored diamondSağlık 0: Yangın koşullarında maruziyet, sıradan yanıcı maddeden kaynaklanan tehlikeden daha fazla risk taşımayacaktır. Örnek: Sodyum klorürYanıcılık 0: Yanmaz. Örnek: SuKararsızlık 0: Genellikle yangın maruziyeti koşullarında dahi normalde kararlıdır ve su ile reaksiyona girmez. Örnek: Sıvı azotÖzel tehlikeler (beyaz): kod yok
0
0
0
5 mg/m3[1] (TWA)
Öldürücü doz veya konsantrasyon (LD, LC):
LD50 (medyan doz)
10 g/kg (rats, oral)[9]
NIOSH ABD maruz kalma limitleri:
PEL (izin verilen) TWA 10 mg/m3[8]
REL (tavsiye edilen) TWA 5 mg/m3[8]
IDLH (anında tehlike) 2500 mg/m3[8]
Benzeyen bileşikler
Diğer anyonlar
Iron(III) fluoride
Diğer katyonlar
Manganese(III) oxide
Cobalt(III) oxide
Benzeyen iron oxides
Iron(II) oxide
Iron(II,III) oxide
Aksi belirtilmediği sürece madde verileri, Standart sıcaklık ve basınç koşullarında belirtilir (25 °C [77 °F], 100 kPa).
Bilgi kutusu kaynakları

Demir (III) oksit veya ferrik oksit, Fe
2
O
3
formülüne sahip inorganik bir bileşiktir. Doğada, çelik endüstrisi için birincil demir kaynağı görevi gören mineral hematit olarak bulunur. Özellikle pigmentlerde kullanıldığında "kırmızı demir" oksit olarak bilinir.

Demirin üç ana oksidinden biridir, diğer ikisi nadir bulunan demir (II) oksit (FeO) ve doğal olarak mineral manyetit olarak da bulunan demir (II,III) oksittir (Fe
3
O
4
).

Demir (III) oksit genellikle pas olarak adlandırılır, çünkü pas birçok özelliği paylaşır ve benzer bir bileşime sahiptir; ancak kimyada pas, sulu ferrik oksit olarak tanımlanan bir malzemedir.[10]

Ferrik oksit zayıf asitler tarafından bile kolayca saldırıya uğrar. Zayıf bir oksitleyici maddedir, en ünlüsü termit reaksiyonunda alüminyum tarafından indirgendiğindedir.

Kaynakça

  1. ^ a b c d Haynes, p. 4.69
  2. ^ a b c Comey, Arthur Messinger; Hahn, Dorothy A. (February 1921). A Dictionary of Chemical Solubilities: Inorganic. 2nd. New York: The MacMillan Company. s. 433. 
  3. ^ Haynes, p. 4.141
  4. ^ a b c d Ling, Yichuan; Wheeler, Damon A.; Zhang, Jin Zhong; Li, Yat (2013). Zhai, Tianyou; Yao, Jiannian (Ed.). One-Dimensional Nanostructures: Principles and Applications. Hoboken, New Jersey: John Wiley & Sons, Inc. s. 167. ISBN 978-1-118-07191-5. 
  5. ^ a b c Kaynak hatası: Geçersiz <ref> etiketi; atmilab isimli refler için metin sağlanmadı (Bkz: Kaynak gösterme)
  6. ^ a b c d e Haynes, p. 5.12
  7. ^ a b c Sigma-Aldrich Co., Iron(III) oxide. Retrieved on 12 Temmuz 2014.
  8. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0344". National Institute for Occupational Safety and Health (NIOSH). 
  9. ^ a b "SDS of Iron(III) oxide" (PDF). KJLC. İngiltere: Kurt J Lesker Company Ltd. 5 Ocak 2012. 15 Temmuz 2014 tarihinde kaynağından (PDF) arşivlendi. Erişim tarihi: 12 Temmuz 2014. 
  10. ^ PubChem. "Iron oxide (Fe2O3), hydrate". pubchem.ncbi.nlm.nih.gov (İngilizce). Erişim tarihi: 11 Kasım 2020. 

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