Diferència entre revisions de la pàgina «Òxid d'alumini»

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{{chembox
[[Fitxer:Corundum-unit-cell-3D-balls.png|thumbnail|Cel·la unitària de l'alúmina]]
| Watchedfields = changed
| verifiedrevid = 477315061
| Name = Òxid d'alumini
| ImageFile = Corundum-3D-balls.png
| ImageSize = 250
| ImageFile2 = Aluminium_oxide2.jpg
|Section1={{Chembox Identifiers
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = LMI26O6933
| InChI = 1/2Al.3O/q2*+3;3*-2
| SMILES = [Al+3].[Al+3].[O-2].[O-2].[O-2]
| InChIKey = PNEYBMLMFCGWSK-UHFFFAOYAC
| PubChem = 9989226
| SMILES1 = [O-2].[O-2].[O-2].[Al+3].[Al+3]
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/2Al.3O/q2*+3;3*-2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = PNEYBMLMFCGWSK-UHFFFAOYSA-N
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo = 1344-28-1
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID=8164808
| RTECS = BD120000
}}
|Section2={{Chembox Properties
| Al=2 | O=3
| Appearance = white solid
| Odor = odorless
| Density =3,987g/cm<sup>3</sup>
| Solubility = insoluble
| SolubleOther = insoluble en [[èter]] <br> pràcticament insoluble en [[etanol]]
| MeltingPt = {{convert|2072|°C|°F K|abbr=on}}<ref>{{cite book| author = Patnaik, P. |title =Handbook of Inorganic Chemicals| publisher = McGraw-Hill| year = 2002| isbn = 0-07-049439-8}}</ref>
| BoilingPt = {{convert|2977|°C|°F K|abbr=on}}<ref>{{cite book |author1=Raymond C. Rowe |author2=Paul J. Sheskey |author3=Marian E. Quinn | contribution =Adipic acid |title=Handbook of Pharmaceutical Excipients |year=2009 |pages = 11–12 |publisher=Pharmaceutical Press |isbn=978-0-85369-792-3}}</ref>
| ThermalConductivity = 30&nbsp;W·m<sup>−1</sup>·K<sup>−1</sup><ref name="properties"/>
| RefractIndex = n<sub>ω</sub>=1,768–1,772 <br>n<sub>ε</sub>=1,760–1,763 <br> [[Birefringence]] 0,008
| MagSus = –37,0·10<sup>−6</sup> cm<sup>3</sup>/mol
}}
|Section3={{Chembox Structure
| CrystalStruct = [[Trigonal]], [[Pearson symbol|hR30]], [[space group]] = R{{overline|3}}c, No. 167
| Coordination = [[octahedral]]
| LattConst_a = 478,5 pm
| LattConst_c = 1299,1 pm
}}
|Section5={{Chembox Thermochemistry
| DeltaHf = −1675,7&nbsp;kJ·mol<sup>−1</sup><ref name=b1>{{cite book| author = Zumdahl, Steven S.|title =Chemical Principles 6th Ed.| publisher = Houghton Mifflin Company| year = 2009| isbn = 0-618-94690-X|page=}}</ref>
| Entropy = 50,92&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name=b1/>
}}
|Section6={{Chembox Pharmacology
| ATCCode_prefix = D10
| ATCCode_suffix = AX04
}}
|Section7={{Chembox Hazards
| PEL = OSHA 15 mg/m<sup>3</sup> (Total Dust)<br>OSHA 5 mg/m<sup>3</sup> (Respirable Fraction)<br>ACGIH/TLV 10 mg/m<sup>3</sup>
| EUClass = Not listed.
| FlashPt = Non-flammable
| NFPA-H = 1|NFPA-F = 0|NFPA-R = 0
| REL = none<ref name=NIOSH/>
| IDLH = N.D.<ref name=NIOSH>{{PGCH|0021}}</ref>
}}
|Section8={{Chembox Related
| OtherAnions = [[Hidròxid d'alumini]]
| OtherCations = [[Triòxid de bor]]<br />[[Òxid de gal·li]]<br />[[Òxid d'indi]]<br />[[Òxid de tal·li]]}}
}}
L''''òxid d'alumini''' o '''alúmina'''<ref>{{GEC|0220783|Alúmina}}</ref> és un òxid [[amfòter]]. És el component principal de minerals com el [[corindó]] o la [[bauxita]]. L'òxid d'alumini s'obté de la [[bauxita]] mitjançant el [[procés Bayer]]. Juntament amb la [[sílice]], és un ingredient principal en la constitució de les [[argila|argiles]] i els [[Vernís|vernissos]], conferint resistència i augmentant la seva temperatura de maduració.
 
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