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chromium dioxide

Product Name
chromium dioxide
CAS No.
12018-01-8
Chemical Name
chromium dioxide
Synonyms
CrO2;accroxr;accroxc;magtrieve;MAGTRIEVE(TM);chromiumdioxide;chromium(iv)dioxide;chromiumoxide(cro2);chromiumdioxide(cro2);Chromium oxide (CrO2)
CBNumber
CB0721172
Molecular Formula
CrO2
Formula Weight
83.99
MOL File
12018-01-8.mol
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chromium dioxide Property

Melting point:
>375 °C (dec.)(lit.)
Boiling point:
decomposes to Cr2O3℃ [KIR78]
Density 
4.85 g/mL at 25 °C(lit.)
solubility 
insoluble in H2O; soluble in acid solutions
form 
brown-black tetragonal powder
color 
brown-black tetragonal powder
Water Solubility 
insoluble H2O, soluble acids giving Cr+++and dichromate [KIR78]
Merck 
13,2254
CAS DataBase Reference
12018-01-8
EPA Substance Registry System
Chromium oxide (CrO2) (12018-01-8)
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Safety

Hazard Codes 
Xi
Risk Statements 
36
Safety Statements 
26-36
WGK Germany 
3
RTECS 
GB6400000
Hazardous Substances Data
12018-01-8(Hazardous Substances Data)
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H319Causes serious eye irritation

Precautionary statements

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Biosynth Carbosynth
Product number
FC168663
Product name
Chromium dioxide
Packaging
500g
Price
$60
Updated
2021/12/16
Biosynth Carbosynth
Product number
FC168663
Product name
Chromium dioxide
Packaging
1kg
Price
$100
Updated
2021/12/16
Biosynth Carbosynth
Product number
FC168663
Product name
Chromium dioxide
Packaging
2Kg
Price
$150
Updated
2021/12/16
Biosynth Carbosynth
Product number
FC168663
Product name
Chromium dioxide
Packaging
5kg
Price
$300
Updated
2021/12/16
Biosynth Carbosynth
Product number
FC168663
Product name
Chromium dioxide
Packaging
10Kg
Price
$450
Updated
2021/12/16
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chromium dioxide Chemical Properties,Usage,Production

Chemical Properties

dark brown or black powder(s); tetr; used in magnetic tapes [KIR78]; ferromagnetic; rutile structure [MER06]

Physical properties

Chromium dioxide [12018-01-8], chromium(IV)oxide, CrO2, is a ferromagnetic material with a specific saturation magnetization Ms/? of 132 A m2 kg?1 at 0 K, corresponding to the spin of two unpaired electrons per Cr4+ ion. TheMs/n value of CrO2 at room temperature is ca. 100 A m2 kg?1; CrO2 magnetic pigments reach values of 77–92 A m2 kg?1. The material crystallizes with a tetragonal rutile lattice in the form of small needles, which have the desired magnetic shape anisotropy. The morphology of the particles can be varied with several dopants, particularly antimony and tellurium. The coercive field strength can be controlled between ca. 30 and 75 kA m?1 (in addition to shape) by doping with transition metal ions, which modify the magneto-crystalline anisotropy of the material; the Fe3+ ion being industrially important.

Uses

Chromium dioxide is used exclusively for magnetic recording media. It may also be used in combination with cobalt-modified iron oxides in the production of magnetic recording media. The world consumption of CrO2 is decreasing continuously as compact disc and digital videodisc are taking over the audio and video market. The sole producer is DuPont.
In the course of the development of pigments for magnetic information storage, CrO2 was the first widely used pigment material that gave a higher recording density than ã-Fe2O3. In the field of audio recording this led to the IEC II standard or “chrome position”.

Uses

Facilitates high yield aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridines.

Uses

In magnetic recording tapes; as catalyst.

Production Methods

The conversion of an intimate mixture of Cr(III) and Cr(VI) compounds into CrO2 under hydrothermal conditions has been developed into an industrial process in autoclaves at ca. 350 °C and 300 bar.
Pure CrO2 slowly disproportionates in the presence of water. The CrO2 crystal surface of commercial pigments is therefore topotactically converted to â-CrOOH, which serves as a protection layer. In the absence of moisture, CrO2 is stable up to ca. 400 °C, above this temperature it decomposes to form Cr2O3 and oxygen.

chromium dioxide Preparation Products And Raw materials

Raw materials

Preparation Products

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chromium dioxide Suppliers

Wuhan Yuqing Jiaheng Pharmaceutical Co., Ltd
Tel
027-83855310 13476018176
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13476018176
Email
408614617@qq.com
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China
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Beijing Ouhe Technology Co., Ltd
Tel
010-82967028 13552068683
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+86-10-82967029
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China
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Sinopharm Chemical Reagent Co,Ltd.
Tel
86-21-63210123
Fax
86-21-63290778 86-21-63218885
Email
sj_scrc@sinopharm.com
Country
China
ProdList
9815
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Beijing HuaMeiHuLiBiological Chemical
Tel
010-56205725
Fax
010-65763397
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waley188@sohu.com
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China
ProdList
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Shanghai Jian Chao Chemical Technology Co., Ltd.
Tel
18017383231 18017383231
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qq:2817624287
Email
lyh_antaeus@163.com
Country
China
ProdList
9347
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Sichuan Wei Keqi Biological Technology Co., Ltd.
Tel
028-81700200 18116577057
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3003855609@qq.com
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Wuxi Zhongkun Biochemical Technology Co., Ltd.
Tel
0510-85629785 18013409632
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sales@reading-chemicals.com
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Shanghai Macklin Biochemical Co.,Ltd.
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15221275939 15221275939
Fax
021-50706099
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shenlinxing@macklin.cn
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China
ProdList
16166
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Hubei Jusheng Technology Co.,Ltd
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027-59599241 18871490274
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027-59599241
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Sigma-Aldrich
Tel
021-61415566 800-8193336
Email
orderCN@merckgroup.com
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China
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51456
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