This article is about neutral chemical compounds composed solely of aluminium, silicon, and oxygen. For related charged compounds containing counterions, see Aluminosilicate.
Aluminium silicate (or aluminum silicate) is a name commonly applied to chemical compounds which are derived from aluminium oxide, Al2O3 and silicon dioxide, SiO2 which may be anhydrous or hydrated, naturally occurring as minerals or synthetic. Their chemical formulae are often expressed as xAl2O3·ySiO2·zH2O. It is known as E numberE559.
Al2SiO5, (Al2O3·SiO2), which occurs naturally as the minerals andalusite, kyanite and sillimanite which have different crystal structures.
Al2Si2O5(OH)4, (Al2O3·2SiO2·2H2O), which occurs naturally as the mineral kaolinite and is also called aluminium silicate dihydrate.[2] It is a fine white powder and is used as a filler in paper and rubber and also used in paints.[2]
Al2Si2O7, (Al2O3·2SiO2), called metakaolinite, formed from kaolin by heating at 450 °C (842 °F).[2]
Al6Si2O13, (3Al2O3·2SiO2), the mineral mullite, the only thermodynamically stable intermediate phase in the Al2O3-SiO2 system at atmospheric pressure.[3] This also called '3:2 mullite' to distinguish it from 2Al2O3·SiO2, Al4SiO8 '2:1 mullite'.
Aluminium silicate is a type of fibrous material made of aluminium oxide and silicon dioxide, (such materials are also called aluminosilicate fibres). These are glassy solid solutions rather than chemical compounds. The compositions are often described in terms of % weight of alumina, Al2O3 and silica, SiO2. Temperature resistance increases as the % alumina increases. These fibrous materials can be encountered as loose wool, blanket, felt, paper or boards.[4]
References
^Whitney, D.L. (2002). "Coexisting andalusite, kyanite, and sillimanite: Sequential formation of three Al2SiO5 polymorphs during progressive metamorphism near the triple point, Sivrihisar, Turkey". American Mineralogist. 87 (4): 405–416. doi:10.2138/am-2002-0404.
^ abcHandbook of Inorganic Compounds, Dale L. Perry, Taylor & Francis, 2011, ISBN978-1-4398-1461-1
^ abCeramic and Glass Materials: Structure, Properties and Processing, James F. Shackelford, R. H. Doremus, Springer, 2008, ISBN978-0-387-73361-6
^Concise Encyclopedia of Composite Materials, ed. Anthony Kelly, MIT Press, 1989, ISBN0-262-11145-4
External links
at the University of Waterloo, Canada
January 29, 2023
aluminium, silicate, this, article, about, neutral, chemical, compounds, composed, solely, aluminium, silicon, oxygen, related, charged, compounds, containing, counterions, aluminosilicate, aluminum, silicate, name, commonly, applied, chemical, compounds, whic. This article is about neutral chemical compounds composed solely of aluminium silicon and oxygen For related charged compounds containing counterions see Aluminosilicate Aluminium silicate or aluminum silicate is a name commonly applied to chemical compounds which are derived from aluminium oxide Al2O3 and silicon dioxide SiO2 which may be anhydrous or hydrated naturally occurring as minerals or synthetic Their chemical formulae are often expressed as xAl2O3 ySiO2 zH2O It is known as E number E559 Aluminium silicate IdentifiersCAS Number 12141 46 7 Y3D model JSmol Interactive imageChemSpider 8488719 NECHA InfoCard 100 032 036E number E559 acidity regulators PubChem CID 10313254UNII T1FAD4SS2M YCompTox Dashboard EPA DTXSID2050451InChI InChI 1S 2Al O3Si 2O c 1 4 2 3 q2 1 2 NKey PZZYQPZGQPZBDN UHFFFAOYSA N NSMILES O Al O Si O O Al OPropertiesChemical formula Al2 SiO5Molar mass 162 0456 g mol 1Except where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa N verify what is Y N Infobox references Contents 1 Examples 2 Aluminium silicate composite materials fibres 3 References 4 External linksExamples Edit Kyanite Andalusite Sillimanite Phase diagram of Al2SiO5 aluminosilicates 1 Al2SiO5 Al2O3 SiO2 which occurs naturally as the minerals andalusite kyanite and sillimanite which have different crystal structures Al2Si2O5 OH 4 Al2O3 2SiO2 2H2O which occurs naturally as the mineral kaolinite and is also called aluminium silicate dihydrate 2 It is a fine white powder and is used as a filler in paper and rubber and also used in paints 2 Al2Si2O7 Al2O3 2SiO2 called metakaolinite formed from kaolin by heating at 450 C 842 F 2 Al6Si2O13 3Al2O3 2SiO2 the mineral mullite the only thermodynamically stable intermediate phase in the Al2O3 SiO2 system at atmospheric pressure 3 This also called 3 2 mullite to distinguish it from 2Al2O3 SiO2 Al4SiO8 2 1 mullite 2Al2O3 SiO2 Al4SiO8 2 1 mullite 3 Aluminium silicate composite materials fibres EditAluminium silicate is a type of fibrous material made of aluminium oxide and silicon dioxide such materials are also called aluminosilicate fibres These are glassy solid solutions rather than chemical compounds The compositions are often described in terms of weight of alumina Al2O3 and silica SiO2 Temperature resistance increases as the alumina increases These fibrous materials can be encountered as loose wool blanket felt paper or boards 4 References Edit Whitney D L 2002 Coexisting andalusite kyanite and sillimanite Sequential formation of three Al2SiO5 polymorphs during progressive metamorphism near the triple point Sivrihisar Turkey American Mineralogist 87 4 405 416 doi 10 2138 am 2002 0404 a b c Handbook of Inorganic Compounds Dale L Perry Taylor amp Francis 2011 ISBN 978 1 4398 1461 1 a b Ceramic and Glass Materials Structure Properties and Processing James F Shackelford R H Doremus Springer 2008 ISBN 978 0 387 73361 6 Concise Encyclopedia of Composite Materials ed Anthony Kelly MIT Press 1989 ISBN 0 262 11145 4External links EditAluminum silicates at the University of Waterloo Canada Retrieved from https en wikipedia org w index php title Aluminium silicate amp oldid 1134832771, wikipedia, wiki, book, books, library,
