Dikaliumoxid

Bezeichnung:Dikaliumoxid

CAS-Nr12136-45-7

Englisch Name:Potassium oxide

CBNumberCB1851546

SummenformelK2O

Molgewicht94.196

MOL-Datei12136-45-7.mol

Synonyma

Dikaliumoxid

Kaliummonoxid

Dikaliumoxid physikalisch-chemischer Eigenschaften

Schmelzpunkt

decomposes at 350℃ [HAW93]

Siedepunkt

691.46℃[at 101 325 Pa]

Dichte

2.350

Dampfdruck

0Pa at 25℃

Löslichkeit

soluble in H2O, ethanol, ethyl ether

Aggregatzustand

gray cubic crystals

Farbe

gray cubic crystals, crystalline

Wasserlöslichkeit

soluble H2O, forming KOH; soluble alcohol and ether [HAW93]

Crystal Structure

Reverse CaF2 type

crystal system

Cube

Space group

Fm3m

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.6447	0.6447	0.6447	90	90	90	0.268

LogP

-5.08 at 25℃

CAS Datenbank

12136-45-7

EPA chemische Informationen

Potassium oxide (12136-45-7)

Sicherheit

RIDADR	2033
HazardClass	8
PackingGroup	II

Gefahreninformationscode (GHS)

Potassium oxide Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
GRAUES HYGROSKOPISCHES KRISTALLINES PULVER
CHEMISCHE GEFAHREN
Starke Base in wässriger Lösung. Reagiert sehr heftig mit Säuren. ätzend. Reagiert heftig mit Wasser unter Bildung von Kaliumhydroxid. Greift viele Metalle in Gegenwart von Wasser an.
ARBEITSPLATZGRENZWERTE
TLV nicht festgelegt.
MAK nicht festgelegt.
AUFNAHMEWEGE
Schwerwiegende lokale Wirkungen auf allen Aufnahmewegen.
INHALATIONSGEFAHREN
Eine gesundheitsschädliche Partikelkonzentration in der Luft kann schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION:
Die Substanz verätzt die Augen, die Haut und die Atemwege. ätzend beim Verschlucken. Inhalation des Aerosols kann zu Lungenödem führen (siehe ANMERKUNGEN). ärztliche Beobachtung notwendig.
LECKAGE
Persönliche Schutzausrüstung: Chemikalienschutzanzug mit umgebungsluftunabhängigem Atemschutzgerät. Verschüttetes Material in trockenen abgedeckten Kunststoff-Behältern sammeln. Reste mit viel Wasser wegspülen.
Chemische Eigenschaften
gray crystal(s) mass; hygroscopic [CRC10] [HAW93]
Verwenden
Potassium oxide is a strong alkaline flux which is similar to sodium oxide but is slightly less strong and it begins its fluxing action earlier than does sodium oxide, at approximately 1382°F (750°C). It's a predictable, stable flux that produces bright glossy glazes, but it can't be used alone as a flux. Potassium produces slightly stronger glaze surfaces than does sodium oxide. Its low viscosity and surface tension create fluid glaze melts, but its high coefficient of expansion and contraction may cause crazing.
As mentioned above, potassium oxide is often found combined with sodium oxide, so it's often written as KNaO. lt's only slightly volatile at ceramic temperatures and is just slightly soluble.Usually used in its insoluble forms as feldspars or slightly soluble frits, potassium oxide can also be introduced to the glaze recipe as soluble pearl ash (potassium carbonate), which can cause some flashing like sodium carbonate.
Insoluble sources of potassium oxide are potash feldspars such as Custer, G-200, K-200, A-3, Kona F-4(Del Monte), Cornwall stone, Plastic Vitrox, volcanic ash, Kona A-1, Bell, Eureka, A-300, and mica. All soda feldspars have some potassium oxide; frits P-25, 3110, and 3124 contain minor amounts. Soluble forms of potassium oxide include pearl ash(K2CO3), potassium nitrate (saltpeter), and unwashed wood ash.
Definition
ChEBI: A metal oxide with formula K2O.
Definition
potassium monoxide: A grey crystallinesolid, K₂O; cubic; r.d. 2.32; decompositionoccurs at 350°C. It maybe prepared by the oxidation ofpotassium metal with potassium nitrate.It reacts with ethanol to formpotassium ethoxide (KOC₂H₅), andwith liquid ammonia to form potassiumhydroxide and potassamide(KNH₂).
Definition
An ionic solid that is white when cold and yellow when hot. It is prepared by heating potassium with potassium nitrate. Potassium monoxide dissolves violently in water to form potassium hydroxide solution. The hydrate K₂O.3H₂O is known. Potassium monoxide dissolves in liquid ammonia with the formation of potassium hydroxide and potassamide (KNH₂).
Allgemeine Beschreibung
A white-colored crystalline solid. Denser than water. Contact may severely irritate skin, eyes and mucous membranes. May be toxic by ingestion, inhalation and skin absorption. Used to make other chemicals.
Air & Water Reaktionen
Soluble in water. The oxides of potassium react with water vigorously and with enough evolution of heat to cause boiling and spattering of hot caustic solution, [Chemical Safety Data Sheets SD-9, SD-10. 1947]. Reacts with warm water with violent explosion [Thorpe and Tlitton J. Chem. Soc. 59:1019: 1891].
Reaktivität anzeigen
The higher oxides of potassium, formed in air, react explosively with pure potassium, sodium, sodium-potassium alloys, and organic matter [Mellor 2, Supp. 3:1559. 1963].
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Brandgefahr
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Flammability and Explosibility
Non flammable

Potassium oxide Upstream-Materialien And Downstream Produkte

Dikaliumoxid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

12136-45-7, Potassium oxide Verwandte Suche:

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