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544884

Iron(III) oxide

nanopowder, <50 nm particle size

Synonym(s):

Ferric oxide

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About This Item

Linear Formula:
Fe2O3
CAS Number:
Molecular Weight:
159.69
NACRES:
NA.23
PubChem Substance ID:
UNSPSC Code:
12352302
EC Number:
215-168-2
MDL number:
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description

crystalline (primarily γ)

Quality Segment

form

nanopowder

composition

Fe₂O₃

reaction suitability

core: iron

surface area

50-245 m2/g

particle size

<50 nm

application(s)

battery manufacturing
catalysts
glass & ceramic

SMILES string

O=[Fe]O[Fe]=O

InChI

1S/2Fe.3O

InChI key

JEIPFZHSYJVQDO-UHFFFAOYSA-N

General description

Iron(III) oxide nanopowder is a fine powder with a particle size of less than 50 nm. It is a red or black solid compound made up of iron and oxygen. It is also known as hematite or ferric oxide. It is a naturally occurring mineral that can also be synthesized in the laboratory. Iron(III) oxide has a number of useful physical properties. It has a high refractive index and is opaque, making it useful as a pigment in paints in inks. Iron(III) oxide is also catalytically active and weakly ferromagnetic at room temperature.

Application

Iron(III) oxide nanopowder has a number of uses due to its magnetic and catalytic properties. It is used in the production of magnetic recording media such as magnetic tapes and disks. It is also used as a catalyst in the production of chemicals, including the production of gasoline and plastics and in environmental remediation.

Features and Benefits

  • High theoretical specific capacity
  • Biocompatibility
  • Ease of coating and modification
  • Non-toxicity

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This Item
31005071063637106
description

nanopowder, <50 nm particle size

description

powder, <5 μm, ≥96%

description

30-63% Fe

description

nanopowder, 50-100 nm particle size (SEM), 97% trace metals basis

particle size

<50 nm

particle size

<5 μm

particle size

-

particle size

50-100 nm (SEM)

form

nanopowder

form

powder

form

powder

form

nanopowder, spherical

composition

Fe₂O₃

composition

-

composition

FeO(OH)

composition

-

application(s)

battery manufacturing
catalysts
glass & ceramic

application(s)

-

application(s)

-

application(s)

battery manufacturing
catalysts

Quality Level

100

Quality Level

100

Quality Level

100

Quality Level

100

reaction suitability

core: iron

reaction suitability

-

reaction suitability

core: iron

reaction suitability

-


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Storage Class

13 - Non Combustible Solids

wgk

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

dust mask type N95 (US), Eyeshields, Gloves



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Questions

1–7 of 7 Questions  
  1. Could you please clarify whether these particles are synthetically produced or derived from a natural source?Product Number :544884

    1 answer
    1. These particles are typically synthetically produced. However, the source of this material may change from lot to lot and is reported in the Certificate of Origin.

      To check the source of a current lot, we kindly ask you to navigate to the https://www.sigmaaldrich.com/techservice, click on "Product Documentation" under the Products Section and provide the required information so that a member of our team can reach out to you to assist further. Thank you.

      Helpful?

  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer
    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf

      Helpful?

  3. Is it correct that the surface has no functional groups or coating and that bare iron oxide is exposed?

    1 answer
    1. Yes, this product does not have any surface functionalization or coating, meaning that bare iron oxide is exposed.

      Helpful?

  4. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer
    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Helpful?

  5. What is the Department of Transportation shipping information for this product?

    1 answer
    1. Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.

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  6. What is the purity of Iron(III) oxide, Product 544884?

    1 answer
    1. The purity of this product is not specifically stated on the certificate of analysis. However, an estimated purity can be determined based on the iron content. One mole of iron (III) oxide contains 2 moles (or 111.694g) of iron. The theoretical amount of iron present is approximately 69.94%. Purity can only be measured for a particular lot, which can be calculated based on the iron content determined for that lot. The ratio of the experimental content and the theoretical content, expressed as a percentage will be the purity of the particular lot. For example, an experimental result of 68.6% iron corresponds to a purity of 98.1%.

      Helpful?

  7. What form of iron (III) oxide is Product 544884?

    1 answer
    1. Both the alpha-form and gamma-form are present in the mineral form naturally. This nanopowder is expected to be comprised of primarily the gamma-form, also known as maghemite.

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