Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite . [3] [4] One of several iron oxides , it is a black-colored powder that is sometimes confused with rust , the latter of which consists of hydrated iron(III) oxide (ferric oxide) Iron(II) oxide is a black ionic solid that is also known as the mineral wustite, which is a black mineral. This mineral is found on Mars, but is not as common as the reddish compound iron(III. Iron(II,III) oxide is the chemical compound with formula Fe 3 O 4. It occurs in nature as the mineral magnetite . It is one of a number of iron oxides , the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe 2 O 3 ) which also occurs naturally as the mineral hematite Iron(II) oxide CAS Number: 1345-25-1: Molecular Weight: 71.844: Density: 5.7 g/mL at 25ºC(lit.) Boiling Point: N/A: Molecular Formula: FeO: Melting Point: 1369ºC: MSDS: USA: Flash Point: N/A à Iron(II) oxide −10 mesh, ≥99.6% trace metals basis; CAS Number: 1345-25-1; EC Number: 215-721-8; Synonym: Ferrous oxide, Iron monooxide; Linear Formula: FeO; find Sigma-Aldrich-400866 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich
Iron (II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite. One of several iron oxide s, it is a black-colored powder that is sometimes confused with rust, the latter of which consists of hydrated iron (III) oxide (ferric oxide) The formula for the iron (II) ion is Fe2+ and the formula for the oxide ion is O2−. An ionic compound is neutral, so the positive and negative charges are equal. In the case of iron (II) oxide, one Fe2+ ion combined with one O2− ion creates a neutral compound. 2+ + 2− = 0. Answer link Iron(II) oxide, also known as ferrous oxide or ferrous iron, is one of the iron oxides. It is a black-colored powder with the chemical formula Fe O . It consists of the chemical element iron in the oxidation state of 2 bonded to oxygen
The oxide residue is analysed for iron(II) and iron(III) by the usual methods. The principal advantage of this approach is that the oxides are not contaminated by reaction products from the iron dissolution. The present paper records a simple and reasonably accurate procedure for the determination of metallic iron and iron(II) and (III) oxides Chemistry:Iron(II) oxide. From HandWiki. Jump to: navigation, search. Iron(II) oxide Names IUPAC name. Iron(II) oxide. Other names Ferrous oxide,iron monoxide. Identifiers CAS Number. 1345-25-1 3D model . Interactive image; ChEBI: CHEBI:50820 ChemSpider: 14237 Gmelin Reference. Iron(II) oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite.One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, which consists of hydrated iron(III) oxide (ferric oxide). Iron(II) oxide also refers to a family of related non-stoichiometric compounds, which are typically iron deficient with compositions ranging. Click to see full answer Similarly, it is asked, is Iron II oxide ionic or covalent? Iron has an electronegativity of 1.83 and oxygen 3.44. The difference is 3.44 - 1.83 = 1.61. The bond character is polar covalent although the difference is very close to that of ionic bonds. So iron oxide is a polar covalent compound with ionic character.. Beside above, what Colour is iron 2 oxide It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare; and iron(II,III) oxide (Fe 3 O 4 ), which also occurs naturally as the mineral magnetite. Iron(III) oxide-Wikipedi
Ferric oxide is an iron oxide. Iron (III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron (II) oxide (FeO) the rarer form, and iron (II,III) oxide (Fe3O4) which naturally as magnetite an iron oxide, Fe 3 O 4, found in cells of some organisms, which may play a part in geomagnetic orientation because of its magnetic properties. See MAGNETOSOMES, MAGNETO TAXIS De senaste tweetarna från @iron_ii_oxide iron(II) oxide. Definition from Wiktionary, the free dictionary. Jump to navigation Jump to search. English . English Wikipedia has an article on: iron(II) oxide. Wikipedia . Noun . iron oxide (uncountable) The chemical compound FeO, iron oxide where iron has a valence of +2 Iron(II,III) oxide is the chemical compound with formula Fe3O4. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe2O3) also known as hematite
Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite. One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, the latter of which consists of hydrated iron(III) oxide (ferric oxide). Iron(II) oxide also refers to a family of related non-stoichiometric compounds, which are typically iron. Iron III Oxide. Iron III Oxide Formula- It is one of the main oxides of iron and is an inorganic compound. Besides, the other two compounds are iron ii oxide (FeO) which is rare, and the other one is iron (II, III) oxide (\( Fe_{3} O_{4}\) ) that occurs naturally as the mineral magnetite Iron(II,III) oxide is a chemical compound.It can be used as an iron ore (source of a material) called magnetite.It is black and brittle.It can oxidize to red iron(III) oxide after some time. It is attracted to magnets.It is a compound that contains iron in two different oxidation states; some of the iron atoms are in a +2 oxidation state and some are in a +3 oxidation state From Wikipedia. Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite.One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, which consists of hydrated iron(III) oxide (ferric oxide). Iron(II) oxide also refers to a family of related non-stoichiometric compounds, which are typically iron. Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe 2 O 3.It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare; and iron(II,III) oxide (Fe 3 O 4), which also occurs naturally as the mineral magnetite.As the mineral known as hematite, Fe 2 O 3 is the main source of iron for the steel industry
Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite . One of several iron oxide s, it is a black-colored powder that is sometimes confused with rust , which consists of hydrated iron(III) oxide (ferric oxide) Iron (II) oxide or ferÂrous oxide is the inÂorÂganic comÂpound with the forÂmula FeO. Its minÂeral form is known as wüstite. One of sevÂeral iron oxÂides, it is a black-colÂored powÂder that is someÂtimes conÂfused with rust, the latÂter of which conÂsists of hyÂdrated iron (III) oxide (ferÂric oxide) Iron II oxide: Also known as ferrous oxide, this compound forms nearly 9% of the earth's mantle. It is primarily black in colour and looks similar to rust. Iron II oxide can be artificially prepared by the thermal decomposition of iron (II) oxalate. Iron II oxide is mostly used as a pigment for tattoo making and also in the manufacturing of cosmetics because of its non-toxic nature Iron(II) oxide synonyms, Iron(II) oxide pronunciation, Iron(II) oxide translation, English dictionary definition of Iron(II) oxide. n. A black powder, FeO, used in the manufacture of steel, green heat-absorbing glass, and enamels
It depends on if its Iron (II) or (III) oxide, if it's solid or aqueous etc. But the simplest way would be this: Al (aq) + FeO2 (aq) > Al2O3 (aq) + Fe (aq) + DeltaH (the symbol for delta and H for heat) But you'll have to balance the equatio For the following reaction, 4.80 grams of oxygen gas are mixed with excess iron . The reaction yields 18.4 grams of iron(II) oxide . iron ( s ) + oxygen ( g ) iron(II) oxide ( s Iron(II) Oxide FeO Molar Mass, Molecular Weight. • FeO + PdF2 = FeF2 + PdO • 2 H2S + FeO = FeS2 + H2O + H Red Iron (III) Oxide Fe2O3 - High Quality Powder - Ferric Oxide, Ferric Iron £ 7.99 - £ 19.99 Select options; Iron (II) Sulphate Heptahydrate Good Grade >98% Purity (Ferrous Sulphate) Magnetite Fe3O4 Black Iron (II,III) Oxide - High Quality Magnetic Powde
Iron (II,III) oxide is the chemical compound with formula Fe 3 O 4. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron (II) oxide (FeO), which is rare, and iron (III) oxide (Fe 2 O 3) also known as hematite Modify Date: 2021-01-23 10:13:08. Iron (II,III) oxide structure. Common Name. Iron (II,III) oxide. CAS Number. 1317-61-9. Molecular Weight. 231.533. Density
Efficient Production of Iron(II) Oxide (Fe2O3): While experimenting with different ways to make Iron Oxide to use in an exothermic reaction demonstration, I tried all the different ways that I found online with varied results. This is the method that I have developed which seems to be the f Looking for Iron(II) oxide? Find out information about Iron(II) oxide. FeO A black powder, soluble in water, melting at 1419°C. Also known as black iron oxide; iron monoxide. McGraw-Hill Dictionary of Scientific & Technical... Explanation of Iron(II) oxide Making Iron (II,III) Oxide (Magnetite) Locate a source of iron (III) (iron in the 3 + oxidation state). An iron (III) salt such as ferric chloride will be easy to add to solution.It is often used for etching copper, so you can buy it online, at a chemical supply store, and sometimes even an electronics store such as RadioShack Also, a fine rust powder would work well
Magnetite Powder - Fe2O3 - Black Iron II/III Oxide - Magnetic Powder - 200g. £9.99. £2.56 postage. or Best Offer. Red Iron Oxide 10lb Bag. £19.48. 562 sold. Red Iron Oxide 25lb Bag. £40.90. Iron Oxide Red 5 Oz Reagent Grade 25 Micron Powder USA SELLER. £6.05. 236 sold Iron(II,III) oxide and Iron(II) hydroxide · See more » Iron(II) oxide. Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. New!!: Iron(II,III) oxide and Iron(II) oxide · See more » Iron(III) chlorid Find out information about Iron(II,III) oxide. lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron.. SECTION 1. IDENTIFICATION. Product Name: Iron(II) Oxide Product Number: All applicable American Elements product codes, e.g. FE2-OX-02 , FE2-OX-03 , FE2-OX-04 , FE2-OX-05 CAS #: 1345-25-1 Relevant identified uses of the substance: Scientific research and development Supplier details: American Elements 10884 Weyburn Ave
Iron(II,III) oxide is the chemical compound with formula Fe3O4. It is one of possible iron oxides. It is found in nature as the mineral magnetite. It contains both Fe2+ and Fe3+ ions and is sometimes formulated as FeO.Fe2O3. It is encountered in the laboratory as a black powder. It exhibits permanent magnetism and is ferrimagnetic, but is sometimes incorrectly described as ferromagnetic.1 Its. Accordingly, what is the formula for iron II nitrite? Iron(II) Nitrite Fe(NO2)2 Molecular Weight -- EndMemo. Also, what is the correct formula for iron III nitride? Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Iron(III) nitrate, or ferric nitrate, is the chemical compound with the formula Fe(NO 3) 3 Iron(II) OxideOVERVIEWIron(II) oxide (EYE-urn two OK-side) is a black, dense powder that occurs in nature as the mineral wustite. It reacts readily with oxygen in the air to form iron(III) oxide and with carbon dioxide to form iron(II) carbonate (FeCO3). Source for information on Iron(II) Oxide: Chemical Compounds dictionary
Make a solution containing iron (III). Add water to the iron (III) oxide source in a beaker (or another glass container of similar size). The aqueous environment (in water) is ideal for the iron (III) and iron (II) molecules to react with each other and with oxygen The FESEM micrograph of iron (II) oxide nanoparticles showed that the average diameters were approximately 50 ± 4 nm (Fig. 1 b).The diffraction peaks of the XRD pattern of the synthesized iron (II) oxide nanoparticles sample showed that the fabricated iron (II) oxide NPs have a pure hexagonal phase with lattice constants a = 5.035 and c = 13.75 In chemical reactions, it function as a mixed oxide (FeO + Fe 2 O 3) (Iron(II oxide + diiron(III) oxide). It was named by the combination of the names of the two compounds (iron(II) oxide and diiron(III) oxide), which then gave iron(II) diiron(III) oxide
Iron (II,III) oxide Fe3O4 - Nanoparticles aqueous suspension, magnetic fluid ca. 300 Gauss, aqueous suspension Contains ca. 3% of stabilizer (oleic acid) Average particle size: 8 nm Concentration: ca. 7 wt.% Fe3O4 - Nanoparticles aqueous suspension, magnetic fluid, Without organic stabilizer Iron(II,III) oxide synonyms, Iron(II,III) oxide pronunciation, Iron(II,III) oxide translation, English dictionary definition of Iron(II,III) oxide. n. The mineral form of black iron oxide, Fe3O4, that often occurs with magnesium, zinc, and manganese and is an important ore of iron Surface functionalized magnetic iron oxide nanoparticles (NPs) are a kind of novel functional materials, which have been widely used in the biotechnology and catalysis. This review focuses on the recent development and various strategies in preparation, structure, and magnetic properties of naked and surface functionalized iron oxide NPs and their corresponding application briefly Iron (II,III) Oxide (Fe3O4) Nanopowder/Nanoparticles Water Dispersion Size: 13-18 nm, 22 wt% Iron Oxide Water Dispersion has excellent properties like high transparency, color strength and strong absorption of UV, high durability and weather fastness. Under favour of its impressive features, iron oxide water dispersion has a wide application areas such as automotive paints and wood finishes. Iron(II,III) Oxide (Fe 3 O 4) is a highly insoluble thermally stable Iron source suitable for glass, optic and ceramic applications. Oxide compounds are not conductive to electricity. However, certain perovskite structured oxides are electronically conductive finding application in the cathode of solid oxide fuel cells and oxygen generation.
What does iron-ii-oxide mean? (chemistry) The chemical compound FeO, iron oxide where iron has a valence of +2. (noun Iron(III) OxideOVERVIEWIron(III) oxide (EYE-urn three OK-side) is a dense, reddish-brown, crystalline compound that usually occurs as lumps or a powder. It occurs in nature as the mineral hematite and is a component of the rust that forms on objects made out of iron that are exposed to the air. Rust itself is actually a complex mixture of iron oxides and hydroxides, including Fe2O3, FeO, Fe3O4. The molecular formula for Iron(III) Oxide is Fe2O3. The SI base unit for amount of substance is the mole. 1 grams Iron(III) Oxide is equal to 0.0062622034690102 mole. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between grams Iron(III) Oxide and mole
Home » Paint components » Fillers » Iron(III) oxide. Iron(III) oxide. ATR-FT-IR spectra of Iron(III) oxide (Fe 2 O 3) MID-IR region (4000-500 cm -1) FAR-IR region (500-80 cm -1) Institute of Chemistry University of Tartu, Estoni Iron(II) oxide, 99.5% (metals basis) MDL. MFCD00016095. EINECS. 215-721-8. Chemical Properties. Formula. FeO (may contain trace amounts of other phases) Formula Weight. 71.85 Form-10 Mesh. Melting point
There are two primary forms, known as (II) and (III), of the oxide in nature, though different elements and compounds sometimes draw from both sources. Rust, for example, is known as iron (II, III) oxide and has the chemical structure Fe 2 O 3 , though the (II, III) designation is also given to magnetite , a compound with the structure Fe 3 O 4 ; a number of other compounds can also be included in this grouping Ferric Oxide, Red, Powder, Technical, also known as iron(II) oxide, is one of the main oxides of iron. It is sometimes referred to as rust and also occurs naturally as the mineral magnetite. Technical grade products supplied by Spectru Shop a large selection of Transition Metal Salts products and learn more about Iron(II) oxide, 99.5% (metals basis), Alfa Aesar. 5g Iron (II,III) oxide is the chemical compound with formula Fe 3 O 4. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron (II) oxide (FeO), which is rare, and iron (III) oxide (Fe 2 O 3) which also occurs naturally as the mineral hematite
http://www.lenntech.com/periodic/water/iron/iron-and-water.htm#ixzz1fgigb8Eq http://jpkc.whut.edu.cn/web18/main/wangluo/webelements/webelements/compounds/text/fe/fe1o1-1345251.html Comment Section 2: [Ferrous oxide and carbon monoxide reacts to make iron and carbon dioxide]This is a redox reaction(An oxidation-reduction reaction)Carbon (II) lost 2 electrons = C (IV) [oxidation] Iron (II) gained 2 electrons = Fe [reduction] CO is a reducing agent, FeO is an oxidizing agent.Section 2: [Ferrous oxide and carbon monoxide reacts to make iron and carbon dioxide]This is a redox. ALDRICH Iron oxide(II,III), magnetic nanoparticles solution, 5nm avg. part. size MilliporeSigma Synonym(s): Magnetic iron oxide nanocrystals; Magnetite; Superparamagnetic iron oxide nanoparticles Empirical Formula: Fe 3 O 4 Linear Formula: Fe 3 O 4 Formula Weight: 231.53 MDL Number: MFCD00011010 Density: 1.00 g/mL a Iron II Oxide. Moleclular Formula: FeO MSDS: Toxicity - minimum amount to be considered dangerous; May be harmful if swallowed, inhaled or absorbed through the skin. Long-term exposure is likely to be harmful. Important points for handling- wear safety glasses
Iron (II) oxide on stainless steel? I noticed after some use that a stainless steel spoon that I have started forming F e O. Stainless steel is not supposed to rust like this. I don't know of any black iron hydroxides, chromium oxides, or chromium hydroxides so that lead me to deduce that it is Iron (II) Oxide Iron(II,III) oxide is mainly used as a black-pigment-catalyst in the Haber process and in the water gas shift reaction. It is used as a contrast-agent in MRI scanning and as a pigment in magnetic applications, polishing compounds, cosmetics, medicines, polymers, rubber, fillers, building, construction, appliances and magnetic inks Perversi, G., Arevalo-Lopez, A.M., Ritter, C. et al. Frustration wave order in iron(II) oxide spinels. Commun Phys 1, 69 (2018). https://doi.org/10.1038/s42005-018-0067-7 Download citatio Iron II oxide is when iron has a valency of 2 and iron III oxide is when it has a valency of 3. Iron II oxide is when iron has a valency of 2 and iron III oxide is when it has a valency of 3 Iron oxide, which is also called ferric oxide, is an inorganic compound having the chemical formula Fe2O3. It is one of the 3 major oxides of iron, and the remaining two being iron (II) oxide (FeO), which is the rare iron (II, and III) oxide (Fe3O4), and also naturally takes place as the mineral magnetite. Since the mineral is referred to as.
Reaction between iron(II) hydroxycarbonate, hydroxide or oxide and sulfuric acid Chemical equation: 2H 2 SO 4 + Fe 2 CO 3 (OH) 2 = 2FeSO 4 + 3H 2 O + CO 2 ↠Iron oxides. Iron II oxide (FeO). Iron III oxide (Fe 2 O 3).; Magnetic iron oxide (Fe 3 O 4).; Iron II oxide (FeO) When heating Iron II Oxalate in absence of air, iron II oxide is produced not iron III oxide is formed because of the presence of carbon monoxide as a product of the reaction which acts as a reducing agent and converts iron III oxide to iron II oxide, Fe 2 O 3 is not formed due to.
Iron Oxide Black: Ferroso ferric oxide, iron (II,III) oxide C.A.S. number Iron Oxide Yellow: 51274-00-1 Iron Oxide Red: 1309-37-1 Iron Oxide Black: 1317-61-9 Chemical formula Iron Oxide Yellow: FeO(OH) · xH 2O Iron Oxide Red: Fe 2O 3 Iron Oxide Black: FeO · Fe 2O 3 Formula weight 88.85 FeO(OH Iron(II) compounds tend to be oxidized to iron(III) compounds in the air. Iron reacts with oxygen in the air to form various oxide and hydroxide compounds; the most common are iron(II,III) oxide (Fe 3 O 4) and iron (III) oxide (Fe 2 O 3). Iron(II) oxide also exists, although it is unstable at room temperature In iron: Compounds or by passing hydrogen over ferric oxide. Ferric oxide is a reddish-brown to black powder that occurs naturally as the mineral hematite. It can be produced synthetically by igniting virtually any ferrous compound in air. Ferric oxide is the basis of a series of pigments ranging from yellow to a Read More; applications. audiotap Synonyms for Iron(II,III) oxide in Free Thesaurus. Antonyms for Iron(II,III) oxide. 1 synonym for magnetite: magnetic iron-ore. What are synonyms for Iron(II,III) oxide One article compares both methods and notes that the size. distribution of the co-precipitated product had a size distribution from about 20-90nm, average of 30nm, in diameter where the thermal decomposition data showed a size. distribution of 6-35nm, average of 14nm, in diameter [19]
6 FeO + O2 → 2 Fe3O4. (b) (318 kJ / mol Fe3O4) x (2 mol Fe3O4) = 636 kJ. So: 6 FeO + O2 → 2 Fe3O4, ΔH = -636 kJ. [The minus sign did not come from the calculation. It is the convention for exothermic processes.]Show more Question: Solid Iron(II) Oxide Reacts With Oxygen Gas To Produce Solid Iron(III) Oxide, Balance The Equation For This Reaction (in Lowest Multiple Integers). DOES IT MAKE SENSE? To Check If You Balanced The Equation Correctly, Make Sure The Number Of Each Type Of Atom Totals The Same On Both Sides Of The Equation Iron (II,III) oxide. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Iron (II,III) oxide, also known as ferrous ferric oxide, black iron oxide, or mineral magnetite, is an iron oxide with the chemical formula Fe3O4
A Simple Protocol for Making Iron(II, III) Oxide (magnetite): Hello.In my first Instructable, I am going to describe the synthesis of iron(II, III) oxide (magnetite).Iron(II, III) oxide is a compound which exhibits ferrimagnetism. It has many uses and a lot of them are descibed on the Internet, some of them Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe 3 O 4. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare; and iron(II,III) oxide (Fe 3 O 4 ), which also occurs naturally as the mineral magnetite. The Schikorr reaction formally describes the conversion of the iron(II) hydroxide (Fe(OH) 2 ) into iron(II,III. Iron oxide (II,III), Fe3O4 magnetic nanoparticles Particular Materials is a supplier of Iron Oxide Fe3O4 magnetic nanoparticles Iron Oxide nanoparticles in their magnetite crystal form (Fe3O4) are the most explored magnetic nanoparticles, due to their extensive application within catalysis, biomedicine, photonic crystals, microfluidics, data storage, environmental remediation and optical filters 854 Iron(ii) oxide (FeO) Hydrogen hexacyanoferrate (H4Fe(CN)6) Elements: Fe 1 O 1 (Z = 32) (Periodic Table) Iron(iii) oxide hydroxide (FeO(OH)) Unit Cell Parameters: a b c alpha beta gamma Volume Density Heat of Formation (Kcal/mol) X-ray: 4.35 4.35 4.35 90.00 90.00 90.00 82.53 5.782 27.4 calc'd using PM7 PM7: 4.41 4.49 4.58 89.93 90.19 90.20 90.63 5.265 -103.1 calc'd using PM7 (ref: -65.0. of iron oxide particles were 1 677, 318 and 957 nm for yellow iron oxide (FeO(OH)), red iron oxide (Fe 2 O 3) and black iron oxide (Fe 3 O 4), respectively. The Panel noted that the method used by industry for measuring the particle size of iron oxides (Rockwood, 2013a) cannot exclude the presence of particles with one or more dimensions below. Iron oxides are chemical compounds composed of iron and oxygen. Altogether, there are sixteen known iron oxides and oxyhydroxide s (Cornell & Schwertmann, 2003). The uses of these various oxides and hydroxides are tremendously diverse ranging from pigments in ceramic glaze, to use in thermite. Oxides: x iron(II) oxide, wüstite (FeO