Titanium hydride (TiH2)
Titanium(II) hydride
CAS: 7704-98-5
Molecular Formula: Ti
Titanium hydride (TiH2) - Names and Identifiers
| Name | Titanium(II) hydride |
| Synonyms | TiH2 itanium hydride titaniumdihydride titanium dihydride Titanium(II) hydride titaniumhydride(tih2) titanium(2+) dihydride Titanium hydride (TiH2) Titaniumhydridemeshgraypowder |
| CAS | 7704-98-5 |
| EINECS | 231-726-8 |
| InChI | InChI=1/Ti.2H/q+2;2*-1 |
| InChIKey | RTAQQCXQSZGOHL-UHFFFAOYSA-N |
Titanium hydride (TiH2) - Physico-chemical Properties
| Molecular Formula | Ti |
| Molar Mass | 47.87 |
| Density | 3.91 g/mL at 25 °C (lit.) |
| Melting Point | >400 °C (dec.) |
| Flash Point | >400°C |
| Water Solubility | Soluble in water. |
| Appearance | Powder |
| Specific Gravity | 3.91 |
| Color | Gray to black |
| Merck | 14,9473 |
| Storage Condition | no restrictions. |
| Sensitive | Moisture Sensitive |
| Physical and Chemical Properties | TiH2 forms a solid solution (TiHl. 8-TiHl. 99) in the Ti-H system, and it only exists stably in hydrogen atmospheres above 400 ℃ and above 0.1MPa. When the temperature is below 400 ℃, it actually exists in the form of TiH2 TiH solid solution. The hydrogen content of titanium hydride obtained in the Ti H system is always lower than that in TiH2. TiH2 is a gray powder with a metallic appearance, with two variants and a conversion temperature of 37 ℃. The low-temperature stable state is a face centered tetragonal crystal system, with lattice constants of a=0.4528nm and c=0.4279nm 37 ℃ is a square crystal system, with a lattice constant of 0.4454nm. At 20 ℃, the density is 3.9lg/cm3. |
Titanium hydride (TiH2) - Risk and Safety
| Hazard Symbols | F - Flammable |
| Risk Codes | R15 - Contact with water liberates extremely flammable gases R11 - Highly Flammable |
| Safety Description | S7/8 - S43A - S24/25 - Avoid contact with skin and eyes. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S33 - Take precautionary measures against static discharges. S16 - Keep away from sources of ignition. S43 - In case of fire use ... (there follows the type of fire-fighting equipment to be used.) |
| UN IDs | 1871 |
| WGK Germany | 3 |
| RTECS | XR2130000 |
| TSCA | Yes |
| HS Code | 2850 00 20 |
| Hazard Class | 4.1 |
| Packing Group | II |
Titanium hydride (TiH2) - Use
Open Data Unverified Data
Titanium dihydrogen is very brittle and can be used to manufacture powdered titanium. It is also used for welding. Titanium dihydrogen decomposes under heat, releasing new ecological hydrogen and metallic titanium, which can promote welding and increase weld strength. Can be used as a catalyst for polymerization reactions.
Last Update：2024-04-09 19:43:38
Titanium hydride (TiH2) - Production method
Open Data Unverified Data
TiH2 can be generated by the reaction of titanium metal with H2 at high temperatures:
Ti+H2=TiH2
The reduction of TiO2 by CaH2 can also produce TiH2, and the reaction is carried out according to equations 2-108.
Last Update：2024-04-09 19:43:38
Titanium hydride (TiH2) - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | X-ray diffraction patterns and metal purity data are available. |
| production method | Ti in a sponge or powder form was placed in a glass tube, and the air in the tube was removed with hydrogen gas. The metal is heated at 350-400 °c in a pure hydrogen stream and the product is cooled in a hydrogen stream after the introduction of excess hydrogen. Note: very dry and oxygen-free hydrogen must be used for hydrogenation. Because O2 and water vapor are effectively combined with Ti, and it is converted into titanium oxide. The chemical formula of titanium hydride prepared by this method is consistent with that of TiH0.5 ~ TiH1.5. Compared with Ti, TiH2 has a more gray color and low stability. Almost complete decomposition was obtained by heating to 800-1000 °c. Therefore, in practice, TiH2 cannot be present alone. The solid solution whose group is TiH1.8 to TiH1.99 is generally considered as tih2. |
| autoignition temperature | 437 ° F. |
Last Update：2024-04-10 22:29:15
