Holmium fluoride
holmium(iii) fluoride
CAS: 13760-78-6
Molecular Formula: F3Ho
Holmium fluoride - Names and Identifiers
| Name | holmium(iii) fluoride |
| Synonyms | HoF3 Holmium fluoride HOLMIUM FLUORIDE holmium trifluoride holmium(iii) fluoride HOLMIUM(III) FLUORIDE holmiumfluoride(hof3) Holmium (III) fluoride Holmium fluoride (HoF3) Holmium fluoride, anhydrous |
| CAS | 13760-78-6 |
| EINECS | 237-352-1 |
| InChI | InChI=1/3FH.Ho/h3*1H;/q;;;+3/p-3 |
Holmium fluoride - Physico-chemical Properties
| Molecular Formula | F3Ho |
| Molar Mass | 221.93 |
| Density | 7,64 g/cm3 |
| Melting Point | 1143°C |
| Boling Point | >2200°C |
| Water Solubility | Insoluble in water. |
| Vapor Presure | 922mmHg at 25°C |
| Appearance | powder |
| Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3 |
| Sensitive | Hygroscopic |
| Refractive Index | 1.53 |
Holmium fluoride - Risk and Safety
| Hazard Symbols | T - Toxic |
| Risk Codes | R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R32 - Contact with acids liberates very toxic gas |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 3288 6.1/PG 3 |
| WGK Germany | 3 |
| TSCA | Yes |
| Hazard Note | Hygroscopic |
| Hazard Class | 6.1 |
| Packing Group | III |
Holmium fluoride - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | fluorobenzene is a pale yellow crystal with a melting point of 1143 °c and a boiling point of 2227 °c. Insoluble in water and dilute acid. It is prepared by the interaction of a solution of phosphonium nitrate and hydrofluoric acid. |
| Application | fluoride is a metal fluoride, which can be used for the preparation of rhodium-containing alloys, electrodes, nano materials and the like. |
| production method | hydrofluoric acid precipitation (vacuum dehydration method). The hydrate of phosphonium trifluoride can be obtained by adding hydrofluoric acid to the aqueous solution of phosphonium sulfate, evaporating, concentrating, cooling and crystallizing the aqueous solution. Alternatively, hydrous phosphonium fluoride is prepared by reacting Ho(OH)3 with hydrofluoric acid and then decrystallizing water by heating in a vacuum. The concentration of hydrofluoric acid is generally 40% to 48%, and its consumption is 110% to 120% of the theoretical amount. The precipitate of the phosphonium fluoride precipitated from the aqueous solution must be sufficiently washed with water and washed with water by a pour method. The precipitate after filtration was dried at 100-150 °c to remove the adsorbed water. Fluoride containing only water of crystallization was obtained. In order to avoid the occurrence of high temperature hydrolysis during dehydration and the formation of oxyfluoride HoOF, the dehydration process needs to be carried out in vacuum. The vacuum degree should be higher than 0δ133pa, and the dehydration temperature should not be lower than 300 ℃. Another method of dehydration is to dehydrate the hydrous fluoride in a stream of dry hydrogen fluoride at a final dehydration temperature of 600 to 650 °c. This dehydration method under the protection of hydrogen fluoride atmosphere can further fluorinate The Hydrous fluoride in the dehydration process, and the quality of the product can be ensured. Due to the hydrofluoric acid precipitation is carried out in aqueous solution, the general use of plastic containers, and dehydration equipment materials must be high temperature corrosion, the general use of nickel-based alloys or pure nickel lining material. |
Last Update：2024-04-10 22:29:15
