7704-98-5

Basic information

• Product Name: TITANIUM HYDRIDE
• Synonyms: TiH2;Titanium hydride (TiH2);titaniumdihydride;titaniumhydride(tih2);TITANIUM(+2)HYDRIDE;TITANIUM HYDRIDE;TITANIUM(II) HYDRIDE;Titaniumhydridemeshgraypowder
• CAS NO: 7704-98-5
• Molecular Formula: H₂Ti
• Molecular Weight: 49.88
• EINECS: 231-726-8
• Product Categories: Materials for Hydrogen Storage;Metal Hydrides;Metal HydridesAlternative Energy;Reduction;Synthetic Reagents;Catalysis and Inorganic Chemistry;Metal HydridesChemical Synthesis;Titanium;metal hydrides;Alternative Energy;Chemical Synthesis;Materials for Hydrogen Storage;Materials Science;Synthetic Reagents
• Mol File: 7704-98-5.mol
• Article Data: 1

Chemical Properties

• Melting Point: 225°C
• Flash Point: >400°C
• Appearance: Gray to black/Powder
• Density: 3.91
• Storage Temp.: Flammables area
• Water Solubility: Soluble in water.
• Sensitive: Moisture Sensitive
• Merck: 14,9473
• CAS DataBase Reference: TITANIUM HYDRIDE(CAS DataBase Reference)
• NIST Chemistry Reference: TITANIUM HYDRIDE(7704-98-5)
• EPA Substance Registry System: TITANIUM HYDRIDE(7704-98-5)

Safety Data

• Hazard Codes: F
• Statements: 15-11
• Safety Statements: 7/8-43A-24/25-36/37/39-33-16-43
• RIDADR: 1871
• WGK Germany: 3
• RTECS: XR2130000
• TSCA: Yes
• HazardClass: 4.1
• PackingGroup: II
• Hazardous Substances Data: 7704-98-5(Hazardous Substances Data)

Usage

Chemical Properties

Titanium Hydride, TiH2, is a brittle, metallic-gray solid, density 3.8 g/cm3, which produces 448 mL H2 at STP per gram TiH2. Titanium hydride powder is stable at room temperature and inert to water and most chemical reagents. Titanium hydride is used as a source for Ti powder, alloys, and coatings; as a getter in vacuum systems and electronic tubes; as a sealer of metals; and as a hydrogen source.

Physical properties

Grayish-black metallic powder; stable in air; density 3.75 g/cm3; decomposes at 450°C with evolution of hydrogen; insoluble in water.

Uses

Different sources of media describe the Uses of 7704-98-5 differently. You can refer to the following data:
1. Additive in powder metallurgy; getter for oxygen and nitrogen in electronic tubes; wetting agent for ceramic to metal seals; source of pure hydrogen.
2. Titanium(II) hydride is widely utilized as an additive in the manufacturing of Alnico sintered magnets and in sintered powdered metals. It is used in the production of metal foam, powdered titanium metal and in pyrotechnics. It is involved in various applications such as ceramics, pyrotechnics and sports equipment. It is also used as a laboratory reagent and as a blowing agent.

Preparation

Titanium hydride is prepared by heating titanium dioxide with calcium hydride at 600°C in the presence of hydrogenAlso, the hydride may be prepared by heating tianium metal with hydrogen at elevated temperatures.

General Description

A white to light colored solid. Insoluble in water and denser than water. Contact may irritate skin, eyes and mucous membranes. May be toxic by ingestion. May ignite and burn with an intense flame if exposed to high temperatures or flame.

Air & Water Reactions

Highly flammable. Pyrophoric in dust form [Bretherick 1979. p. 104]. Insoluble in water.

Reactivity Profile

Hydrides, such as TITANIUM HYDRIDE, are reducing agents and react rapidly and dangerously with oxygen and with other oxidizing agents, even weak ones. Thus, they are likely to ignite on contact with alcohols. Hydrides are incompatible with acids, alcohols, amines, and aldehydes.

Hazard

Flammable, dangerous fire risk, dust may explode in presence of oxidizing agents.

Flammability and Explosibility

Notclassified

InChI:InChI=1/Ti.2H/q+2;2*-1

Synthetic route

titanium (7440-32-6) + hydrogen (1333-74-0) + oxygen (80937-33-3) → titanium(IV) hydroxide (20338-08-3) + titanium dihydride (7704-98-5) + [TiH(OH)3] (956378-98-6) + titanium dihydroxide (42765-12-8) + HTiO(OH)

Conditions	Yield
In neat (no solvent) Irradiation (UV/VIS); laser ablated Zr co-deposited with H2+O2 in excess Ar onto a 10K CsI window, UV-irradiated, annealed at 22-34 K (mechanism discussed); not isolated, detected by IR;

titanium (7440-32-6) + hydrogen (1333-74-0) + oxygen-18 (32767-18-3) → titanium dihydride (7704-98-5) + Ti((18)OH)2 (872215-20-8) + HTi(18)O((18)OH) + HTi((18)OH)3 + Ti((18)OH)4 (872207-84-6)

Conditions	Yield
In neat (no solvent) laser ablated Zr co-deposited with H2+(18)O2 in excess Ar onto a 10K CsIwindow, annealed at 20 K (mechanism discussed); not isolated, detected by IR;

titanium (7440-32-6) + hydrogen (1333-74-0) → titanium dihydride (7704-98-5)

Conditions	Yield
500°C, p(H2)= 1.5-2 MPa, according to: K. N. Semenenko, V. P. Malyshev, L. A. Petrova, et al., Izv. Akad. Nauk SSSR, Neorg. Mater. 13 (1977) 2009;

lanthanum nickel + titanium dihydride (7704-98-5) → LaNi5H7.0

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → H0.71Ti

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.85

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + LaNi2.00 → LaNi2H4.2

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

lanthanum nickel + titanium dihydride (7704-98-5) → LaNiH3.1

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + La3Ni → La3NiH8.5

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → titanium hydride

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

lanthanum (7439-91-0) + titanium dihydride (7704-98-5) → lanthanum trihydride (13864-01-2)

Conditions	Yield
components placing in glass vac. apparatus of Sieverts type (20-25°C, P<1 atm), according to: V. I. Mikheeva, M. E. Kost, Zhur. Neorg. Khim. 3 (1958) 260; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.30

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.90

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.49

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.73

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.04

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.23

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.51

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.58

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.17

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

Upstream product

• 7440-32-6 titanium 
• 1333-74-0 hydrogen 
• 80937-33-3 oxygen 
• 32767-18-3 oxygen-18 

Downstream Products

• 13864-01-2 lanthanum trihydride 

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