Цахиурын давхар исэл хуудасны эх кодыг харах

{{Chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 476993639
| ImageFile1 = Sample of silicon dioxide.jpg
| ImageCaption1 = Цэвэр цахиурын давхар исэл
| ImageFile1_Ref = {{Chemboximage|correct|??}}
| ImageNameR1 = A sample of silicon dioxide as sand in a dune
| ImageCaptionR1 = Элс байдалтай цахиурын давхар исэл
| IUPACName = Silicon dioxide
| OtherNames = Quartz<br />
Silica<br />
Silicic oxide<br />
Silicon(IV) oxide<br />
Crystalline silica
|Section1={{Chembox Identifiers
| CASNo = 7631-86-9
| CASNo_Ref = {{cascite|correct|CAS}}
| PubChem = 24261
| ChemSpiderID = 22683
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| UNII = ETJ7Z6XBU4
| UNII_Ref = {{fdacite|correct|FDA}}
| EINECS = 231-545-4
| KEGG = C16459
| KEGG_Ref = {{keggcite|changed|kegg}}
| MeSHName = Silicon+dioxide
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 30563
| RTECS = VV7565000
| Gmelin = 200274
| SMILES = O=[Si]=O
| StdInChI = 1S/O2Si/c1-3-2
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = VYPSYNLAJGMNEJ-UHFFFAOYSA-N
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
}}
|Section2={{Chembox Properties
| Formula =SiO<sub>2</sub>
| MolarMass = 60.08 g/mol
| Appearance = Transparent crystals
| Density = 2.648 (α-quartz), 2.196 (amorphous) g·cm<sup>−3</sup><ref name=b92>{{RubberBible92nd}}</ref>
| MeltingPt = 1,713&nbsp;°C (3,115 °F; 1,986 K) (amorphous)<ref name=b92/>{{rp|page=4.88}} to | BoilingPt = 2,950&nbsp;°C (5,340 °F; 3,220 K)<ref name=b92/>
| Solubility = 
| RefractIndex = 1.544 ([[Birefringence|o]]), 1.553 (e)<ref name=b92/>{{rp|page=4.143}}
| ThermalConductivity = 12 (<nowiki>||</nowiki> c-axis), 6.8 (⊥ c-axis), 1.4 (am.) W/(m⋅K)<ref name=b92/>{{rp|page=12.213}}
}}
|Section3={{Chembox Hazards
| MainHazards = 
| NFPA-H = 0
| NFPA-F = 0
| NFPA-R = 0
| IDLH = 3000 mg/m<sup>3</sup> (аморф)<ref name=PGCH0552>{{PGCH|0552}}</ref><br/>Ca [25 mg/m<sup>3</sup> (кристобалит, тридимит); 50 mg/m<sup>3</sup> (кварц)]<ref name=PGCH0682>{{PGCH|0682}}</ref>
| REL = TWA 6 mg/m<sup>3</sup> (аморф)<ref name=PGCH0552/><br/>Ca TWA 0.05 mg/m<sup>3</sup><ref name=PGCH0682/>
| PEL = TWA 20 mppcf (80 mg/m<sup>3</sup>/%SiO<sub>2</sub>) (аморф)<ref name=PGCH0552/>
}}
|Section4={{Chembox Related
| OtherFunction_label = давхар исэлүүд
| OtherFunction = [[Нүүрсхүчлийн хий|Нүүрстөрөгчийн давхар исэл]]<br />
[[Германийн давхар исэл]]<br />
[[Цагаан тугалганы давхар исэл]]<br />
[[Хар тугалганы давхар исэл]]
| OtherCompounds = [[Цахиурын исэл]]<br />
[[Цахиурын сульфид]]
}}
|Section5={{Chembox Thermochemistry
| DeltaHf = −911&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=A22}}</ref>
| Entropy = 42&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name=b1/>
}}
}}

'''Цахиурын исэл''' (SiO<sub>2</sub>) нь хамгийн тогтвортой элемент боловч HF-тай урвалд ордог.

== Эх сурвалж ==
{{Reflist}}

== Цахим холбоос ==
*Tridymite, {{ICSC|0807|08}}
*Quartz, {{ICSC|0808|08}}
*Cristobalite, {{ICSC|0809|08}}
*amorphous, [http://www.cdc.gov/niosh/npg/npgd0552.html NIOSH Pocket Guide to Chemical Hazards]
*crystalline, as respirable dust, [http://www.cdc.gov/niosh/npg/npgd0684.html NIOSH Pocket Guide to Chemical Hazards]
*[http://crystec.com/klloxide.htm Formation of silicon oxide layers in the semiconductor industry]. LPCVD and PECVD method in comparison. Stress prevention.
*[https://web.archive.org/web/20110715083534/http://piezomaterials.com/Quartz-SiO2.htm Quartz SiO<sub>2</sub> piezoelectric properties]
*[http://water-chemistry.blogspot.com/2008/08/silica-sio2.html Silica (SiO<sub>2</sub>) and Water]
*[https://web.archive.org/web/20120618153827/http://www.iom-world.org/pubs/IOM_TM9709.pdf Epidemiological evidence on the carcinogenicity of silica: factors in scientific judgement] by C. Soutar and others. [[Institute of Occupational Medicine]] Research Report TM/97/09
*[https://web.archive.org/web/20120618132318/http://www.iom-world.org/pubs/IOM_TM9508.pdf Scientific opinion on the health effects of airborne silica] by A Pilkington and others. [[Institute of Occupational Medicine]] Research Report TM/95/08
*[https://web.archive.org/web/20160415111007/http://www.iom-world.org/pubs/IOM_TM8713.pdf The toxic effects of silica] by A Seaton and others. [[Institute of Occupational Medicine]] Research Report TM/87/13
* [https://web.archive.org/web/20150715023306/http://www.antenchem.com/en/News/Silicas-Technology/Structureofprecipitatedsilica.html Structure of precipitated silica]

{{commons category-inline|Silicon dioxide}}
*{{Cite EB1911|wstitle=Silica}}

{{Цахиурын эрдсүүд}}
{{Ислүүд}}
{{Цахиурын нэгдлүүд}}

[[Ангилал:Цахиурын нэгдэл]]
[[Ангилал:Оксид]]
[[Ангилал:Эмийн туслах бодис]]
[[Ангилал:Хүнсний нэмэлт бодис (Европын Холбоо)]]
[[Ангилал:Гоо сайхны агуулгын бодис]]
[[Ангилал:Гадар будгийн материал]]
[[Ангилал:Дүүргэгч бодис]]
[[Ангилал:Хагас дамжуулагч электроникийн бэлдэц]]
[[Ангилал:Тэжээлийн нэмэлт бодис (Европын Холбоо)]]