99.99% Purity Nb2O5 Niobium Oxide for Superconducting Alloys Optical Lenses

Niobium Oxide (Nb₂O₅): Superconducting Alloys, Optical Lenses, and Piezoelectric Ceramic Capacitors

Niobium oxide is an inorganic compound with chemical formula Nb₂O₅, molecular weight 265.81, white crystals, melting point 1460°C, relative density 4.47, relative dielectric constant 35-50, band gap 3.4eV. Turns yellow when heated to 400°C, soluble in hydrofluoric acid, hot sulfuric acid and alkalis, insoluble in water - the most stable oxide. Its hydrate has chemical formula Nb₂O₅·xH₂O, decomposes when heated, soluble in concentrated sulfuric acid, concentrated hydrochloric acid, hydrofluoric acid and strong alkalis, insoluble in water and ammonia water. Can be obtained by burning metallic niobium in air or dehydrating niobic acid.

Applications

1. For manufacturing high-temperature alloys and superconducting alloys.
2. For manufacturing optical glass.
3. For manufacturing capacitors in electronics industry [piezoelectric, thermosensitive, electrothermal ceramics, etc.].
4. For manufacturing coating materials.

Product Series

Health and Safety Information

Signal Word	Warning
Hazard Statements	H315-H319-H335
Hazard Codes	Xi
Precautionary Statements	P261-P305+P351+P338
Flash Point	N/A
Risk Codes	36/37/38
Safety Statements	26-36
RTECS Number	QU0500000
Transport Information	NONH
WGK Germany	nwg
GHS Pictogram

Packaging Specifications

• Standard packaging: 50 kg/drum, 500 kg/pallet, ton bags
• Sample packaging: 500 g/bag, 1 kg/bottle

About Niobium Oxide
Calcination method: Niobium material or crude niobium pentoxide is dissolved in a mixed solution of nitric acid and hydrofluoric acid to generate fluoroniobic acid, then niobium is extracted by mixing with strong acid and methyl isobutyl ketone organic phase. After back extraction, ammonia water reacts with fluoroniobic acid to generate niobium hydroxide precipitate, which is then washed, dried and calcined to obtain refined niobium pentoxide.

Chemical reactions:
3Nb + 5HNO₃ + 21HF → 3H₂NbF₇ + 5NO + 10H₂O
H₂NbF₇ + 7NH₄OH → Nb(OH)₅ + 7NH₄F + 2H₂O
2Nb(OH)₅ → Nb₂O₅ + 5H₂O

Niobium pentoxide is mainly used in ceramics, electronic ceramics, optical glass, glass coatings, liquid crystal displays, energy and other industries. In recent years, with the rapid development of glass coatings, liquid crystal displays and other industries, the demand for niobium pentoxide targets, especially high-quality niobium pentoxide targets, has been increasing. Normally, for high-quality targets, first it requires high density (>99.5%) and high purity (>99.99%); second it requires good microstructure, meaning the target crystal particles should be at micrometer scale with uniform distribution. In addition, niobium pentoxide targets need to have good mechanical properties.