查看“︁五氧化二鏷”︁的源代码

{{Chembox
| IUPACName = Protactinium(V) oxide
| ImageFile = Protactinium(V) oxide.jpg
| ImageName = Protactinium(V) oxide
| Section1 = {{Chembox Identifiers
| CASNo = 12036-75-8
|  SMILES = O=[Pa](=O)O[Pa](=O)=O
|  StdInChI = 1S/5O.2Pa
|  InChI = 1S/10O.4Pa
|  StdInChIKey = LDJMPPCAULZCAH-UHFFFAOYSA-N
|  InChIKey = YHCILLCTPZINHI-UHFFFAOYSA-N
}}
| Section2 = {{Chembox Properties
|  Formula={{Chem|Pa|2|O|5|}}
|  MolarMass = 542.0688
|  Appearance = 白色不透明晶體
| Density = 10.96 g/cm<sup>3</sup>
}}
| Section3 = {{Chembox Structure
|  CrystalStruct = [[立方晶系]]
|  SpaceGroup = Fm{{overline|3}}m, No. 225
}}
|Section7={{Chembox Hazards
| MainHazards = 剧毒、有放射性
| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}
| NFPA-H = 4
| NFPA-F = 0
| NFPA-R = 0
| NFPA-S = RA
}}
}}
'''五氧化二鏷'''是一種[[鏷]]的[[氧化物]]，化學式為{{Chem|Pa|2|O|5|}}，是白色不透明[[晶體]]，外觀和另一個[[鏷]][[氧化物]]——[[二氧化鏷]]有很大的不同，'''五氧化二鏷'''是白色而[[二氧化鏷]]是黑色。五氧化二鏷与氢气反应产生二氧化鏷。<ref name="When it is reduced with hydrogen, it forms PaO2.">{{cite journal | doi =  10.1021/ja01652a011 | year =  1954 | last1 =  Sellers | first1 =  Philip A. | last2 =  Fried | first2 =  Sherman | last3 =  Elson | first3 =  Robert E. | last4 =  Zachariasen | first4 =  W. H. | journal =  Journal of the American Chemical Society | volume =  76 | pages =  5935 | title = The Preparation of Some Protactinium Compounds and the Metal}}</ref>

== 歷史 ==
1927年，德国核化学家{{le|阿里斯蒂德·格罗斯|Aristid von Grosse}}（Aristid von Grosse）制做出2毫克的五氧化二鏷<ref>{{cite journal|author = von Grosse, Aristid |title = Das Element 91; seine Eigenschaften und seine Gewinnung |pages = 233–245|journal = [[Berichte der deutschen chemischen Gesellschaft]]|doi = 10.1002/cber.19280610137|volume = 61|issue = 1|year = 1928}}</ref>。

== 制備 ==
[[二氧化鏷]]和氫氣反應產生五氧化二鏷<ref name="When it is reduced with hydrogen, it forms PaO2."/>是可逆反應。
: {{Chem|Pa|2|O|5}} + {{Chem|H|2}} → 2{{Chem|PaO|2}} + {{Chem|H|2|O}}

[[鏷]]在空氣中燃燒：
:<math>\mathsf{4Pa + 5O_2 \ \xrightarrow{350^oC}\ Pa_2O_5 }</math>

== 參考文獻 ==
{{Reflist}}
{{鏷化合物}}
{{氧化物}}
{{Inorganic-compound-stub}}

[[Category:氧化物]]
[[Category:鏷化合物]]
[[Category:1920年代发现的物质]]