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Rubidium oxide

CAS number : 18088-11-4

Molecular weight :336.54

Molecular formula/chemical symbol :Rb2O3

Description :

density :3.518g/cm3

Rubidium oxide is the chemical compound with the formula Rb2O. Rubidium oxide is highly reactive towards water, and therefore it would not be expected to occur naturally. The rubidium content in minerals is often calculated and quoted in terms of Rb2O. In reality, the rubidium is typically present as a component of (actually, an impurity in) silicate or aluminosilicate. A major source of rubidium is lepidolite, KLi2Al(Al,Si)3O10(F,OH)2, wherein Rb sometimes replaces K.

Rb2O is a yellow colored solid. The related species Na2O, K2O, and Cs2O are colorless, pale-yellow, and orange, respectively.

The alkali metal oxides M2O (M = Li, Na, K, Rb) crystallise in the antifluorite structure. In the antifluorite motif the positions of the anions and cations are reversed relative to their positions in CaF2, with rubidium ions 8 coordinate (cubic) and oxide ions 4 coordinate (tetrahedral).

Rubidium oxide

IUPAC name[hide]

Rubidium oxide

Other names[hide]  Rubidium(I) oxide

Dirubidium oxide

Identifiers

CAS number

18088-11-4 YesY

Properties

Molecular formula

Rb2O

Molar mass

186.94 g/moL

Appearance

Yellow solid

Density

4 g/cm3

Melting point

>500 °C

Solubility in water

Reacts violently to give RbOH

Structure

Crystal structure

Antifluorite (cubic), cF12

Space group

Fm3m, No. 225

Coordination
geometry

Tetrahedral (Rb+); cubic (O2–)

Hazards

EU Index

Not listed

Main hazards

Corrosive, reacts violently with water

Flash point

Non-flammable

Related compounds

Other cations

Lithium oxide
Sodium oxide
Potassium oxide
Caesium oxide

Related rubidium oxides

Rubidium suboxide
Rubidium peroxide
Rubidium superoxide

Related compounds

Rubidium hydroxide

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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

USES :

Used as a TV glass bulbs, glassware coloring agent the metal neodymium and magnetic materials raw materials

Report :

Product name

Rubidium oxide

CAS18088-11-4

Description

Lavender powder

TEST ITEMS

TEST RESULTS

Rb2O3

≥99.9

≥99.5

≥99.0

La2O3

≤0.01

≤0.02

≤0.05

CeO2

≤0.01

≤0.05

≤0.05

Pr6O11

≤0.03

≤0.20

≤0.50

Sm2O3

≤0.01

≤0.03

≤0.05

Eu2O3

≤0.0050

≤0.01

≤0.01

Y2O3

≤0.0050

≤0.01

≤0.01

Fe2O3

≤0.0020

≤0.0030

≤0.0030

CaO

≤0.0030

≤0.0050

≤0.0050

Al2O3

≤0.0050

≤0.0100

≤0.0300

SiO2

≤0.0050

≤0.0050

≤0.0050