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Terbium(III,IV) oxide
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Terbium(III,IV) oxide, occasionally called tetraterbium heptaoxide, has the formula Tb4O7, though some texts refer to it as TbO1.75. There is some debate as to whether it is a discrete compound, or simply one phase in an interstitial oxide system. Tb4O7 is one of the main commercial terbium compounds, and the only such product containing at least some Tb(IV) (terbium in the +4 oxidation state), along with the more stable Tb(III). It is produced by heating the metal oxalate, and it is used in the preparation of other terbium compounds. Terbium forms three other major oxides: Tb2O3, TbO2, and Tb6O11.
Quick Facts Names, Identifiers ...
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Names | |
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IUPAC name
Tetraterbium heptaoxide | |
Other names
Terbium(III,IV) oxide, Terbium peroxide | |
Identifiers | |
3D model (JSmol) |
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ECHA InfoCard | 100.031.675 ![]() |
PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
Tb4O7 | |
Molar mass | 747.6972 g/mol |
Appearance | Dark brown-black hygroscopic solid. |
Density | 7.3 g/cm3 |
Melting point | Decomposes to Tb2O3 |
Insoluble | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Oxidising agent. |
Related compounds | |
Other cations |
Terbium(III) oxide Terbium(IV) oxide |
Related compounds |
Cerium(IV) oxide Praseodymium(III,IV) oxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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