Tantalum oxide

Molecular Formula: O₅Ta₂
Molar mass: 441.89 g/mol
Density: 8.2 g/mL at 25 °C(lit.)
Melting point: 1872 °C
Appearance: white to white-beige powder
Solubility: Dissolved in molten potassium hydrogen sulfate and hydrofluoric acid, insoluble in water and other acids.
Structure of Tantalum oxide (CAS NO.1314-61-0):
                         
IUPAC Name: Oxygen(2-) ; Tantalum(5+)
Canonical SMILES: [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5]
InChI: InChI=1S/5O.2Ta/q5*-2;2*+5
InChIKey: BPUBBGLMJRNUCC-UHFFFAOYSA-N
Product Category of (D)-Xylose (CAS NO.58-86-6): Inorganic Chemicals;Inorganics

 Tantalum oxide (CAS NO.1314-61-0) can be used for the pull-Lithium tantalate single crystal and manufacture of special high-refraction low dispersion optical glass. It also can be used in chemicals as a catalyst.

1. Potassium tantalum fluoride and sulfuric acid will be heated to 400 ℃, add water to the boiling reactants to make the well-diluted acid solution to have the hydrolysis to produce hydrous oxides precipitate, and then by being separated, washing, drying, at last get the product.
2.Soluble the tantalum sheet metal in mixture of nitric acid and hydrofluoric acid, purified by extraction, precipitated with ammonia hydroxide, and then by washing, drying, burning, grinded, get the product.

Carcinogenicity of TANTALUM(V) OXIDE(1314-61-0) hasn't been listed as a carcinogen by  NTP, IARC,ACGIH, or CA Prop 65.And its toxicological properties have not been fully investigated.You can see actual entry in RTECS for complete information.

Reported in EPA TSCA Inventory.

Mildly toxic by ingestion. Incompatible with ClF₃, BrF₃, Li. See also TANTALUM.
Hazard Codes: Xi
Risk Statements:
36:  Irritating to the eyes
37:  Irritating to the respiratory system
38:  Irritating to the skin
Safety Statements:
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
37:  Wear suitable gloves
39:  Wear eye/face protection

OSHA PEL: TWA 5 mg/m³
ACGIH TLV: TWA 5 mg/m³

 Tantalum oxide , its cas register number is 1314-61-0. It also can be called Tantalum pentoxide ; Tantalic acid anhydride ; and Tantalum pentoxide . It is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product: Wash mouth out with water, and get medical aid immediately. Notes to physician: Treat supportively and symptomatically.
In addition,  Tantalum oxide (CAS NO.1314-61-0) is not compatible with strong oxidizing agents, and you must not take it with incompatible materials.