Prométium(III)-oxid

Prométium(III)-oxid
IUPAC-név Prométium(III)-oxid
Más nevek Prométium-szeszkvioxid.
Kémiai azonosítók
CAS-szám 12036-25-8
Kémiai és fizikai tulajdonságok
Kémiai képlet Pm2O3
Moláris tömeg 337.824 g/mol
Olvadáspont ~2320 °C[1]
Kristályszerkezet
Kristályszerkezet Cubic
Rokon vegyületek
Azonos kation Prométium(III)-klorid
Azonos anion Neodímium(III)-oxid, Szamárium(III)-oxid, Neptúnium(III)-oxid
Ha másként nem jelöljük, az adatok az anyag standardállapotára (100 kPa) és 25 °C-os hőmérsékletre vonatkoznak.

A prométium(III)-oxid egy kémiai vegyület, képlete Pm2O3. A prométium legközönségesebb formája.

Kristályszerkezete

A prométium-oxid három fő kristályosodási formában jelenik meg:[1]

Forma Tércsoport a,b,c (nm) β(deg) Z Sűrűség
(g/cm³)
Köbös Ia3 1,099 16 6,85
Monoklin C2/m 1,422; 0,365; 0,891 100,1 6 7,48
Hexaéder P3m1 0,3802; 0,3802; 0,5954 1 7,62

*a, b és c a rácsparamétereket jelöli, Z a molekulák száma elemi cellánként, a sűrűség pedig röntgen-sugarakkal lett megmérve.

A alacsony hőmérsékletű köbös alak 700-800 °C-ra hevítés után monoklinná alakul. Ez az átalakulás csak a vegyület megolvasztásával fordítható meg. A monoklin kristályok kb. 1740 °C-on alakulnak vissza köbössé.

Fordítás

Ez a szócikk részben vagy egészben a Promethium(III) oxide című angol Wikipédia-szócikk ezen változatának fordításán alapul. Az eredeti cikk szerkesztőit annak laptörténete sorolja fel. Ez a jelzés csupán a megfogalmazás eredetét és a szerzői jogokat jelzi, nem szolgál a cikkben szereplő információk forrásmegjelöléseként.

Források

  1. a b (1972) „Polymorphic Modifications of Pm2O3”. Journal of the American Ceramic Society 55 (8), 428. o. DOI:10.1111/j.1151-2916.1972.tb11329.x. 

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