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Chromium(III) oxide Struktur

Chrom (III) oxid

Bezeichnung:Chrom (III) oxid

CAS-Nr1308-38-9

Englisch Name:Chromium(III) oxide

CBNumberCB8394705

SummenformelCr2O3

Molgewicht151.99

MOL-Datei1308-38-9.mol

Synonyma

Chrom (III) oxid

Dichromtrioxid

Chrom (III) oxid physikalisch-chemischer Eigenschaften

Schmelzpunkt

2435 °C

Siedepunkt

4000 °C

Dichte

5.21

Brechungsindex

2.551

Flammpunkt

3000°C

storage temp.

Room Temperature

Löslichkeit

Insoluble in all solvents

Aggregatzustand

powder

Farbe

Pale to dark green

Wichte

5.22

Geruch (Odor)

at 100.00?%. odorless

Wasserlöslichkeit

Insoluble

Crystal Structure

Trigonal

crystal system

Three sides

Merck

14,2234

Space group

R3c

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.496	0.496	1.359	90	90	120	0.2895

Expositionsgrenzwerte

NIOSH: IDLH 25 mg/m3; TWA 0.5 mg/m3

Sicherheit

S-Sätze:	24/25
WGK Germany	-
RTECS-Nr.	GB6475000
TSCA	Yes
HS Code	28199090
Giftige Stoffe Daten	1308-38-9(Hazardous Substances Data)

Gefahreninformationscode (GHS)

Chromium(III) oxide Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
HELL- BIS DUNKELGRüNES PULVER.
ARBEITSPLATZGRENZWERTE
TLV: (als Chrommetall, Cr(III)-verbindungen) 0.5 mg/m?(als TWA); Krebskategorie A4 (nicht klassifizierbar als krebserzeugend für den Menschen); (ACGIH 2005).
MAK nicht festgelegt (DFG 2005).
INHALATIONSGEFAHREN
Eine gesundheitsschädliche Partikelkonzentration in der Luft kann beim Dispergieren schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION:
Reizt möglicherweise die Augen und die Atemwege mechanisch.
LECKAGE
Verschüttetes Material in Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Persönliche Schutzausrüstung: Atemschutzgerät, P2-Filter für schädliche Partikel.
S-Sätze Betriebsanweisung:
S24/25:Berührung mit den Augen und der Haut vermeiden.
Beschreibung
Chromium(III) oxide is among the ten most abundant compounds in the Earth's crust. It is one of four oxides of chromium, chemical formula Cr2O3. It is commonly called "chrome green" when used as a pigment; however it was referred to as “viridian” when it was first discovered.

Chromium(III) oxide is a very refractory ceramic colorant (even a 50% mix with a high borax frit will not even begin to melt it in a crucible). Chrome oxide is the only stable oxide of the metal chromium. It is a bright to dark green crystalline powder insoluble in alkalis and acids. It is manufactured from the mineral Chromite mined in southern Africa, Asia, Turkey and Cuba. As with other powerful coloring agents, chrome must be milled fine enough to eliminate specking in glass or glaze.
Chromium is a "fast" colorant, meaning can produce strong green colors under all furnace conditions, slow or fast, reducing or oxidizing. It is also a flat colorant (due to its refractory nature), it usually produces an army helmet opaque green. It is powerful, typically only 2% will produce a dark color. It cannot be used to make a metallic glaze.
Chrome oxide is usually employed in raw glazes whereas potassium dichromate is used in fritted glazes.
Chemische Eigenschaften
Chromium oxide is a bright green, odorless powder. Chromium(III) oxide pigments are thermally stable and insoluble in water.
Chromium oxide pigments, also called chromium oxide green pigments, consist of chromium(III) oxide [1308-38-9], Cr2O3,Mr 151.99. Chromium oxide green is one of the few single-component pigments with green coloration. Chrome green is a blend of chrome yellow and iron blue pigments; phthalochrome green is a blend of chrome yellow and blue phthalocyanine pigments.
Alkali dichromates are used as starting materials for the production of chromium(III) oxide pigments. They are not classified as hazardous materials and are not subject to international transport regulations. As long as they are kept dry their utility as a pigment is practically unlimited.
Physikalische Eigenschaften
Green hexagonal crystal system; corundum type structure; density 5.22 g/cm³; melts at 2,330°C; vaporizes above 3,000°C; insoluble in water and alcohol.
Verwenden
Chromium oxide (Cr2O3) is a dull green synthetic inorganic pigment, which can be used in all types of paint systems where high chemical resistance and outstanding light-fastness are required.
Verwenden
Chromium(III) oxide is used as pigment for coloring green on glass and fabrics. Other important applications are in metallurgy; as a component of refractory bricks, abrasives and ceramics; and as a catalyst in hydrogenation, hydrogenolysis and many other organic conversion reactions. It also is used to prepare other chromium salts.
Verwenden
In abrasives, refractory materials, electric semiconductors; as pigment, particularly in coloring glass; in alloys; printing fabrics and banknotes; as catalyst for organic and inorganic reactions.
Definition
Chromium oxide (Cr2O3) also called green rouge is a dull yellowish-green pigment that may be prepared by blending an alkali dichromate with sulfur or with a carbonaceous material. Reduction to chrome (III) oxide is achieved in a kiln at 1000°C. And it is used chiefly for platinum and stainless steels.
synthetische
Chromium(III) oxide can be obtained by thermal decomposition of ammonium dichromate. Above ca. 200 °C, a highly voluminous product is formed with elimination of nitrogen. The pigment is obtained after addition of alkali salts (e.g., sodium sulfate) and subsequent calcination.
In the industrial process, a mixture of ammonium sulfate or chloride and sodium dichromate is calcined:
Na2Cr2O7.2 H2O + (NH4)2SO4 →Cr2O3 + Na2SO4 + 6 H2O + N2
Definition
chromium sesquioxide: A green crystallinewater-insoluble salt, Cr₂O₃; r.d. 5.21;m.p. 2435°C; b.p. 4000°C. It is obtainedby heating chromium in astream of oxygen or by heating ammoniumdichromate. The industrialpreparation is by reduction ofsodium dichromate with carbon.Chromium(III) oxide is amphoteric,dissolving in acids to give chromium(III) ions and in concentratedsolutions of alkalis to give chromites.It is used as a green pigment in glass,porcelain, and oil paint.
Reaktionen
Chromium(III) oxide is amphoteric. Although insoluble in water, it dissolves in acid to produce hydrated chromium ion, [Cr(H2O)6]3+. It dissolves in concentrated alkali to yield chromite ion. When heated with finely divided aluminum or carbon it is reduced to chromium metal:
Cr2O3 + 3Al2Cr + Al2O3
Heating with chlorine and carbon yields chromium(III) chloride:
Cr2O3 + 3Cl2 + 3C2CrCl3 + 3CO
If chromium(III) oxide (also known as chrome green) is heated with potassium carbonate and potassium nitrate, the mixture slowly turns yellow. This colour change stems from the formation of potassium chromate, K2CrO4, in which chromium is found in oxidation state vi.
Allgemeine Beschreibung
Chromium (III) oxide is a chromium complex in which the chromium ion is in +3 oxidation state. The synthesis of its sub-micron powder has been reported.? The IR and Raman spectra of chromium (III) oxide have been studied.? The impact of adding lysozyme on the stability of chromium (III) oxide (Cr₂O₃) suspension has been evaluated.?
Hazard
Toxic by ingestion and inhalation.
Flammability and Explosibility
Not classified
Sicherheitsprofil
Confirmed carcinogen with experimental tumorigenic data. Mutation data reported. Probably a severe
Toxikologie
Chromium(III) oxide, which forms the basis of chromium oxide pigments, crystallizes in a corundum lattice. Chromium oxide green pigments (Cr2O3, C.I. Pigment Green 17) contain only trivalent chrome. Acute toxicity: rat, oral, LD50>10 000 mg/kg.
mögliche Exposition
Chromium(III) oxide is used as a paint pigment, a fixative for certain textile dyes; in the manufacture of chromium; and a catalyst.
Erste Hilfe
If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately.If this chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPRif heart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, getmedical attention. Give large quantities of water andinduce vomiting. Do not make an unconscious personvomit.
Lager
(1) Color Code—Blue: Health Hazard/Poison:Store in a secure poison location. (2) Color Code—Yellow:Reactive Hazard; Store in a location separate from othermaterials, especially flammables and combustibles.Chromium(III) oxide must be stored to avoid contact withstrong oxidizers (such as chlorine, bromine, and fluorine),glycerol, and oxygen difluoride, since violent reactionsoccur. A regulated, marked area should be establishedwhere chromium(III) oxide is handled, used, or stored.Store in tightly closed containers in a cool, well-ventilatedarea.
Versand/Shipping
UN3086 Toxic solids, oxidizing, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, 5.1-Oxidizer. Technical Name Required. Spill Handling: Evacuate persons not wearing protective equipment from the danger area of spill or leak until cleanup is complete. Remove all ignition sources. Collect powdered material in the most convenient and safe manner and deposit in sealed containers. Ventilate area after clean-up is complete. It may be necessary to contain and dispose of this chemical as a hazardous waste. If material or contaminated runoff enters waterways, notify downstream users of potentially contaminated waters. Contact your local or federal environmental protection agency for specific recommendations. If employees are required to clean-up spills, they must be properly trained and equipped. OSHA 1910.120(q) may be applicable.

Properties and Applications

TEST ITEMS	SPECIFICATION
APPEARANCE	GREEN POWDER
CONTENT OF Cr ₂ O ₃	85% min
SHADE	YELLOWISH
HYDROTROPE	0.5% max
OIL ABSORPTION	25% max
RESIDUE ON 45 MESH	0.1% max
WATER SOLUBLE	0.3% max
VOLATITE 105 °C	0.05% max
TINTING STRENGTH	95-100 %
pH VALUE OF AQUEOUS SUSPENSION	Structure and conformation Chromium oxide is a dense, crystalline material, density 5.2 g/cm3, of the corundum type. It is quite hard-abut 9 on the Moh scale-which makes it a good grinding material, but too abrasive for many pigment applications. The particle size depends on the manufacturing process, but it is distributed around mean values in the range 0.5-0.6 μm. The refractive index of chromium oxide is quite high, 2.5, which is almost as high as that of rutile TiO2, 2.7. Chromium oxide pigments are green with an olive green tint. Small particles are lighter green with a yellowish hue, whereas larger particles are darker, with a bluish tint. Chromium oxide pigments are very inert materials with outstanding lightfastness and excellent resistance to acids, alkalis, and high temperatures. Inkompatibilitäten A strong oxidizer. Contact with reducing agents; organics, and combustibles may be violent Chromium(III) oxide Upstream-Materialien And Downstream Produkte Upstream-Materialien Dichromtris(sulfat) Schwefelwasserstoff High speed pulverizer Phthalocyanine blue pigment filter paper Chrom (III) hydroxid Natriumdichromat Dihydrat Preussisch Blau Schwefeldioxid Chromtrioxid Schwefeltrioxid Kaliumdichromat Middle chrome yellow Lead chrome yellow pigment [29H,31H-Phthalocyaninato(2-)-N29,N30,N31,N32]Kupfer Cadmiumsulfid Chromate, Ion chromatography standard solution, Specpure, CrO4ˉ2 1000μg/ml Filter press Sulphur Bariumchlorid Kaliumchlorid Kaliumsulfat 1of5 Downstream Produkte Alkyd resin paint Natriumdichromat Dihydrat Water proof agent CR Chrom Furfurylalkohol Chrom (III) oxid Anbieter Lieferant Produzent Hersteller Vertrieb Händler. Global(502)Suppliers Region Belgium 1 Canada 1 China 383 Czech Republic 1 Europe 4 France 2 Germany 6 Ghardaia 1 India 31 Japan 7 Slovakia 1 South Korea 1 Switzerland 1 The Netherlands 1 United Kingdom 9 United States 52 Clear All Done Hebei Weibang Biotechnology Co., Ltd Telefon +8615531157085 E-Mail abby@weibangbio.com Shaanxi Dideu Medichem Co. Ltd Telefon +86-29-81148696<br/>+86-15536356810 E-Mail 1022@dideu.com Hebei Yanxi Chemical Co., Ltd. Telefon +8617531190177 E-Mail peter@yan-xi.com Hebei Chuanghai Biotechnology Co,.LTD Telefon +86-13131129325 E-Mail sales1@chuanghaibio.com Hebei Weibang Biotechnology Co., Ltd Telefon +8617732866630 E-Mail bess@weibangbio.com Wuhan Han Sheng New Material Technology Co.，Ltd Telefon +8617798174412 E-Mail admin01@hsnm.com.cn Hebei Jingbo New Material Technology Co., Ltd Telefon +8619931165850 E-Mail hbjbtech@163.com Henan Fengda Chemical Co., Ltd Telefon +86-371-86557731<br/>+86-13613820652 E-Mail info@fdachem.com Hebei Saisier Technology Co., LTD Telefon +86-18400010335<br/>+86-18034520335 E-Mail admin@hbsaisier.cn Hebei Longbang Technology Co., LTD Telefon +86-18633929156<br/>+86-18633929156 E-Mail admin@hblongbang.com 1of2 1308-38-9, Chromium(III) oxide Verwandte Suche: Chrom (III) hydroxid Kaliumchromat Chrom Oxalsäure Russ Cobaltoxid Ammoniumdichromat Dieisentrioxid Dicobalttrioxid Lanthanoxyd Magnesiumoxid Dibortrioxid Yttriumoxid Thuliumoxid Europium(III)oxid Dibismuttrioxid Dimangantrioxid Diantimontrioxid 1of4 Send Inquriy Website-Startseite\| CAS\| Die PC-Version Chemical Book

Chrom (III) oxid

Gefahreninformationscode (GHS)

Chromium(III) oxide Chemische Eigenschaften,Einsatz,Produktion Methoden

Chromium(III) oxide Upstream-Materialien And Downstream Produkte

Chrom (III) oxid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

1308-38-9, Chromium(III) oxide Verwandte Suche: