207621-21-4
Ferrosoferric oxide
CAS: 1317-61-9;107720-80-9;118440-50-9;122391-58-6;139660-10-9;144856-04-2;170277-36-8;207621-21-4;208666
Molecular Formula: Fe3O4-2
207621-21-4 - Names and Identifiers
207621-21-4 - Physico-chemical Properties
| Molecular Formula | Fe3O4-2 |
| Molar Mass | 231.53 |
| Density | 4.8-5.1g/mLat 25°C(lit.) |
| Melting Point | 1538°C(lit.) |
| Flash Point | 7°C |
| Water Solubility | Insoluble in water and organic solvents. Soluble in concentrated mineral acids. |
| Solubility | Soluble in acid, insoluble in water, ethanol and ether. |
| Appearance | Black powder |
| Specific Gravity | 5.2 |
| Color | black |
| Merck | 14,4040 |
| Storage Condition | -20°C |
| Stability | Stable. Incompatible with strong acids, chloroformates, peroxides. |
| Refractive Index | 3.0 |
| MDL | MFCD00011010 |
| Physical and Chemical Properties | Black powder. Odorless. Insoluble in water or organic solvents. Difficult to dissolve in concentrated inorganic acid. The relative density was 5.18. Melting point (decomposition) 1538 °c. |
| Use | This product is for scientific research only and shall not be used for other purposes. |
207621-21-4 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| UN IDs | 3 |
| WGK Germany | - |
| TSCA | Yes |
| HS Code | 28211000 |
207621-21-4 - Reference
| Reference Show more | 1. Tang, Xuejiao, Jingjing Xue, and Cheng Xing. "Catalytic decomposition of toxic phosphine gas on the developed nickel ferrite nanocrystals supported by Halloysite nanotubes." Applied Surface Science 530 (2020): 147264.https://doi.org/10.1016/j.apsusc.2020.1 2. [IF=12.732] Yujing Jiang et al."Trifunctional modification of individual bacterial cells for magnet-assisted bioanodes with high performance in microbial fuel cells."J Mater Chem A. 2020 Dec;8(46):24515-24523 3. [IF=6.707] Xuejiao Tang et al."Catalytic decomposition of toxic phosphine gas on the developed nickel ferrite nanocrystals supported by Halloysite nanotubes."Appl Surf Sci. 2020 Nov;530:147264 4. [IF=5.909] Chen Chen et al."Insight into the difference in activation of peroxymonosulfate with nitrogen-doped and non-doped carbon catalysts to degrade bisphenol A."J Environ Chem Eng. 2021 Aug;9:105492 5. [IF=6.165] Zijie Wang et al.Removal of boron in desalinated seawater by magnetic metal-organic frame-based composite materials: Modeling and optimizing based on methodologies of response surface and artificial neural network.J Mol Liq. 2021 Nov;:118090 6. [IF=3.882] Yun-yun Song et al.Cactus-Inspired Janus Membrane with a Conical Array of Wettability Gradient for Efficient Fog Collection.Langmuir. 2021;37(46):13703–13711 |
207621-21-4 - Nature
Open Data Verified Data
black powder, soluble in hot hydrochloric acid, insoluble in water and organic solvents. Cubic crystal structure, ferromagnetism. Than the saturation magnetization (a.) 105 riTrr13.g-l; Curie temperature (to) 585 deg C; Magnetostriction coefficient (A.) 18 x 10-6, magnetocrystalline anisotropy constant (Ki) -1.1 x 104 J/1113.
Last Update：2024-01-02 23:10:35
207621-21-4 - Preparation Method
Open Data Verified Data
The divalent iron salt solution was added with NaOH solution, and the acicular iron yellow FeOOH was generated by air oxidation. The iron yellow was filtered, washed with water and dried. The dried iron oxide yellow is dehydrated by heat treatment at 270~300 ℃ and then calcined at 550 ℃ for 30min to obtain acicular iron red Fez 03 as an intermediate product. The acicular iron red is reduced by a reduction method (such as hydrogen reduction method and ethanol reduction method). The product was obtained as a needle-like Fe3 04 magnetic powder. After cooling to 80~100 ℃ under the protection of nitrogen, the oxidation of Fe3O4 magnetic powder with air for 2~3H was carried out to improve the oxidation stability.
Last Update：2022-01-01 08:59:21
207621-21-4 - Standard
Authoritative Data Verified Data
This product shall be calculated by burning to constant weight, and the content of Fe203 shall not be less than 96.0%.
Last Update：2024-01-02 23:10:35
207621-21-4 - Trait
Authoritative Data Verified Data
- This product is black powder; Odorless, tasteless.
- This product is insoluble in water; Soluble in boiling hydrochloric acid.
Last Update：2022-01-01 11:26:49
207621-21-4 - Introduction
Ferroferric oxide is an oxide of iron. Its chemical formula is Fe3O4 and its relative molecular mass is 231 · 53. Ferroferric oxide is the only combined iron that can be magnetized. It is also a kind of metadesite, which can be written in the form of Fe(FeO2)2. It can also be written as Fe2O3 · FeO oxide superposition. It can be seen from here that two iron atoms in ferroferric oxide are trivalent and one is bivalent. Iron ore rich in ferric oxide is also called magnetite. Ferroferric oxide can be obtained by burning iron in oxygen.
Last Update：2022-10-16 17:13:21
207621-21-4 - Use
Open Data Verified Data
audio tape, magnetic ink character recognition system. Needle-like Fe3 04 is often used as an intermediate product of 7-Fe2 03 magnetic powder.
Last Update：2022-01-01 08:59:21
207621-21-4 - Differential diagnosis
Authoritative Data Verified Data
take about O .lg of this product, add 5ml of dilute hydrochloric acid, boil and cool, the solution shows the identification reaction of iron salt (General rule 0301).
Last Update：2022-01-01 11:26:50
207621-21-4 - Exam
Authoritative Data Verified Data
soluble in water
take 2.0g of this product, add 100ml of water, heat and reflux on a water bath for 2 hours, filter, wash the filter residue with a small amount of water, combine the filtrate and wash solution, in an evaporating Dish having a constant weight at 105 ° C., it was evaporated to dryness, and dried at 105C to a constant weight, and the remaining residue should not exceed 10mg(0.5%).
insolubles in acid
take 2.0g of this product, add 25ml of hydrochloric acid, heat in water bath to dissolve, add 100ml of water, and filter through No. 4 vertical melting crucible with constant weight of 105°C, the filter residue was washed with hydrochloric acid solution (1-100) until the washing liquid was colorless, and then washed with water until the washing liquid did not show the reaction of the vaporized product, and dried at 105 ° C. To constant weight, and the remaining residue should not exceed 6mg(0.3%).
ignition weight loss
take this product about l.Og, precision weighing, burning to constant weight at 800°C, loss of weight should not exceed 4.0% (General 0831).
barium salt
take 0.2g of this product, add 5ml of hydrochloric acid, heat to dissolve, Dropwise add 1 drop of hydrogen peroxide solution, add 20ml of 10% sodium hydroxide solution, filter, filter residue is washed with 10ml of water, the filtrate and washing solution were combined, and 10ml sulfuric acid solution (2-10) was added, without turbidity.
Lead
take 2.5g of this product, put it in 100ml plug Erlenmeyer flask, and add O.lmol/L hydrochloric acid solution 35ml, stirred for 1 hour, filtered, filter residue with 0.1 mol/L hydrochloric acid solution was washed, the filtrate and washing solution were combined and placed in a 50ml measuring flask, and O was added. 1 mol/L hydrochloric acid solution was diluted to the scale, and shaken to be used as a test solution. The absorbance was measured at a wavelength of 0406 · Onm according to Atomic Absorption Spectrophotometry (General 217). Take another 2.5ml of standard lead solution, put it in a 50ml measuring flask, add 5ml of 1 mol/L hydrochloric acid solution, dilute it to the scale with water, shake it well, and measure it by the same method. The absorbance of the test solution shall not be greater than that of the control solution (0.001%).
arsenic salt
take 0.67g of this product, add 0822 of hydrochloric acid, heat to dissolve, add of water, Dropwise add acid gasification stannous solution to make yellow fade, check according to law (General rule first method), the provisions (0.0003%) shall be met.
Last Update：2022-01-01 11:26:51
207621-21-4 - Content determination
Authoritative Data Verified Data
take about 800g of this product, which has been burned to constant weight at 0.15°C, and weigh it precisely. Place it in a plug Erlenmeyer flask, add 5ml of hydrochloric acid, place it in a water bath and heat it to dissolve it. Add 2ml of hydrogen peroxide test solution, heat to boiling for several minutes, add water 25ml, cool, add potassium iodide 1.5g and hydrochloric acid 2.5ml, plug, shake, stand in the dark for 15 minutes, with sodium thiosulfate titration solution (O. 1 mol/L) titration, adding 2.5ml of starch indicator solution to the near end point, and continuing titration until the blue color disappeared. Each 1 ml of sodium thiosulfate titration solution (0.1 mol/L) corresponds to 7.985 mg of fe203.
Last Update：2022-01-01 11:26:51
207621-21-4 - Category
Authoritative Data Verified Data
pharmaceutical excipients, colorants and coating materials.
Last Update：2022-01-01 11:26:51
207621-21-4 - Storage
Authoritative Data Verified Data
sealed storage.
Last Update：2022-01-01 11:26:52
207621-21-4 - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Molecular structure | Ferroferric oxide (Fe3O4) is a ferric acid salt, namely Fe2 Fe3 (Fe3 O4)(that is, FeFe(FeO4) The valence state of the first 2 and 3 generations of surface iron). In Fe3O4, iron has two valence states, one iron atom has two valence and two iron atoms have three valence. Therefore, ferroferric oxide can be regarded as a compound composed of FeO and Fe2O3, which can be expressed as FeO″ Fe2O3, but not as a mixture of FeO and Fe2O3. It is a pure substance. X-ray analysis of ferroferric oxide proves that it is an ionic crystal. Fe2 ,Fe3 and O2-ions exist in the crystal. Each unit cell has 8 Fe2 ,16 Fe3 and 32 O2-, which is equivalent to 8 Fe3O4 and O2-ions as the most dense cubic stacking, and half (8) of Fe3 is embedded in the tetrahedral voids in the stacking, however, all Fe2 and the other half Fe3 are irregularly distributed in octahedral voids, with the average Fe2 and Fe3 each accounting for half. Because of the disorderly arrangement of Fe2 and Fe3 in the octahedral position, electrons can rapidly transfer between the two oxidation states of iron, so the solid of Fe3 oxide has excellent conductivity, and its structural formula can be expressed as [Fe3 ]t[Fe2 Fe3 ]oO4. |
| react with acid | under certain conditions, ferric oxide (Fe304) can react with acid: (1) react with non-oxidizing acid, and the valence remains unchanged, such as dilute hydrochloric acid, dilute sulfuric acid: Fe3O4 8H = Fe2 2Fe3 4H2O. (2) reacts with oxidizing acid, iron becomes the highest valence, increasing 1 valence: 3Fe304 NO3-28H = 9Fe3 NO↑ 14H2O. (3) Reacts with reducing acid, iron becomes low price 2, and the total price decreases by 2 price. For example, HI acid: Fe3O4 2I-8H = 3Fe2 4H2O I2, Fe304 can be reduced by H2,CO or coke under heating conditions to obtain iron. |
| main uses and functions | Fe3O4 is a commonly used magnetic material. Because of its significant ratio and strong magnetism, it has shown good performance in sewage treatment. It can also be used as pigment and polishing agent. Special pure ferroferric oxide is used as a raw material for audio tapes and telecommunications equipment. Ferroferric oxide is the main raw material for the production of iron catalysts (a catalyst). It has a large hardness and can be used as an abrasive. It has been widely used in the field of automobile braking, such as: brake pads, brake shoes, etc. We can also use certain chemical reactions, such as the use of sodium nitrite, etc., to form a dense layer of ferroferric oxide on the surface of the steel to prevent or slow down the corrosion of the steel, such as firearms, saw blades, etc. The surface is blue and black. Commonly known as "roasted blue". |
| identification test | solubility insoluble in water and organic solvents, insoluble in concentrated inorganic acids. Measured according to OT-42 method. |
| content analysis | accurately weigh about 0.2g of the sample, move it into a 200ml conical flask, add 10ml of 5mol/L hydrochloric acid, and carefully heat it to boiling until the sample is completely dissolved. Cool, add 6 to 7 drops of 30% hydrogen peroxide solution, and then carefully heat to boiling until the excess hydrogen peroxide is completely decomposed (about 2 to 3 min). Cool, add 30ml of water and about 2g of potassium iodide, and let stand for 5min. Add 30ml of water and starch test solution (TS-235) as indicator and titrate with 0.1mol/L sodium thiosulfate solution. 0 ~ mol/L sodium thiosulfate per mL is equivalent to 5.585mg of ferric ion. |
| toxicity | ADl 0~0.5 mg/kg(FAO/WHO,2001). Germany is not allowed. See Iron Oxide Brown. |
| use limit | is limited to indirect food use, and the dosage is not limited (FDA,§ 186.1300,2000). Can be used for casing (0.10% of finished product quantity) and cat and dog food (0.25%),FDA, 73.200,2000.GB 2760-96: Candy coating 0.02 g/kg. |
| use | edible melanin. Used as an analytical reagent, also used in the pharmaceutical industry, pigment preparation and electronics industry Used as the main raw material of ammonia catalyst Used as a pigment for watercolor, oil color, and ink. The coating industry is used to manufacture antirust paints and other primers. The construction industry is used for coloring artificial marble and cement floors. The electronic telecommunications industry is used to manufacture magnets and also as cathode plates for alkaline dry batteries. Used in steel flaw detection in machine manufacturing. Used for the coloring of tablets and capsules. used for pigments and polishing agents, etc., used for coating, plastic and building surface coloring used in medicine, metallurgy, electronics and textile industries, as well as used as catalysts, polishing agents, paints and ceramics, etc. Pigments, glass colorants, etc. Special magnetic iron oxide can be used to make audio tapes and telecommunications equipment. The application fields of spherical ferroferric oxide magnetic powder are as follows: 1. Raw materials for producing high-grade toner for laser printers, and raw materials for producing toner (high coercivity) for photocopiers. 2. Magnetic seal, which can be used as a rotary shaft seal for mechanical seals. 3. Metal, ceramic, nano ceramic, composite ceramic substrate, ferrite material. 4. The cathode plate of alkaline dry battery can be used for steel flaw detection in the machinery manufacturing industry. 5. Anti-ultraviolet material, microwave absorption material and magnetic recording material. 6. Magnetic health care materials can be widely added into various chemical fibers, plastics, rubber, etc. to produce various health care products and health care products. 7. Coloring of building structures and concrete products. Watercolor, paint, paint, etc. |
| production method | except for heavy metals and arsenic added in the process, see iron oxide black. The addition method reacts iron filings with sulfuric acid to produce ferrous sulfate, and then adds caustic soda and ferric oxide to carry out the addition reaction at 95~105 ℃ to produce ferric oxide, which is filtered, dried, and crushed to produce iron oxide black. Its Fe H2SO4 → FeSO4 H2 ↑ FeSO4 2NaOH → Fe(OH)2 Na2SO4Fe(OH)2 Fe2O3 → Fe3O4 H2O is obtained by heating ferrous sulfate to above 1000 ℃. It is obtained by the action of air, water vapor or carbon dioxide on iron. |
Last Update：2024-04-10 22:29:15
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View History
207621-21-4
1H-Purine, 6-methyl-, 1-oxide (9CI)
3H-Benz[f]indazole-4,9-dione, 9a-chloro-3a,9a-dihydro-3,3-dimethyl-, cis- (9CI)
2-[(1,2-Dimethyl-3-piperidinyl)methyl]-3H-indol-3-one
tert-butyl (3R)-3-{[(benzyloxy)carbonyl]aMino}-4-(hydroxyMethyl)
946074-05-1
632-21-3
3-IODOPHENYLACETONITRILE
1,2-Ethanediol,1-(2-chlorophenyl)-, 2-carbaMate, (1S)-
1-(2,4-difluorophenyl)-2-methyl-2-phenylpropan-1-amine
1H-Purine, 6-methyl-, 1-oxide (9CI)
3H-Benz[f]indazole-4,9-dione, 9a-chloro-3a,9a-dihydro-3,3-dimethyl-, cis- (9CI)
2-[(1,2-Dimethyl-3-piperidinyl)methyl]-3H-indol-3-one
tert-butyl (3R)-3-{[(benzyloxy)carbonyl]aMino}-4-(hydroxyMethyl)
946074-05-1
632-21-3
3-IODOPHENYLACETONITRILE
1,2-Ethanediol,1-(2-chlorophenyl)-, 2-carbaMate, (1S)-
1-(2,4-difluorophenyl)-2-methyl-2-phenylpropan-1-amine