Terbium oxide
Properties
Chemical formula: Tb₄O₇
Name: Terbium(III,IV) oxide / terbium oxide
CAS No.: 12037-01-3
Molar mass: 747.70 g/mol
Density: 7.30 g/cm³
Melting point: approx. 2410 °C
Color: dark brown to chocolate brown
Form: fine powder
Solubility: insoluble in water, soluble in hot concentrated acids
Terbium oxide (Tb₄O₇), also known as terbium(III,IV) oxide, is an inorganic compound belonging to the group of rare-earth oxides. It is typically supplied as a fine, odorless dark-brown to chocolate-brown powder and is characterized by very high thermal stability.
Terbium oxide is insoluble in water but dissolves in hot concentrated acids, forming the corresponding terbium salts. Similar to praseodymium oxide, Tb₄O₇ is a mixed-valence oxide containing both Tb³⁺ and Tb⁴⁺ ions.
One of the most important properties of terbium is its intense green photoluminescence around 545 nm, caused by electronic transitions of Tb³⁺ ions. This makes terbium oxide particularly important for green phosphors used in displays, LEDs and lighting applications.
The material also exhibits strong magneto-optical activity. Terbium compounds are used in materials with a high Verdet constant, enabling controlled rotation of the polarization plane of light in magnetic fields. Tb₄O₇ is commonly produced by calcining terbium oxalate or terbium hydroxide in air at temperatures above 800 °C.
The element terbium is used both as terbium metal and in the form of specialized compounds. Terbium and its compounds are relevant for phosphors, high-performance magnets, magneto-optical systems, sensors and specialty alloys.
Would you like to buy terbium oxide? Auremo offers terbium oxide, terbium metal and other rare metals. The terbium price, terbium metal price and terbium price per kg primarily refer to metallic terbium, while the price of terbium oxide depends on purity, particle size, order quantity and delivery conditions.
Advantages
• Intense green photoluminescence
• High efficiency in green phosphors
• Strong magneto-optical activity
• Suitable for materials with a high Verdet constant
• Can improve temperature stability of specialty magnetic materials
• Very high thermal stability
• Stability at temperatures above 2400 °C
• Suitable for optical, magnetic and electronic functional materials
Applications
• Green phosphors
• Displays and LEDs
• Fluorescent lighting systems
• Magneto-optical components
• Terbium gallium garnet (TGG) crystals
• Optical isolators and Faraday rotators
• High-performance NdFeB magnets
• Electric motors and automotive applications
• Terfenol-D magnetostrictive alloys
• Precision sensors and vibration systems
• Sonar systems
• Materials science and research
Auremo offers a wide range of terbium, terbium oxide and other rare metals at competitive prices. If you have any questions about Tb₄O₇, terbium metal, available purity grades, particle sizes or delivery conditions, please contact us directly.
