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Terbium(III) oxide

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Title: Terbium(III) oxide  
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Language: English
Subject: Terbium(III,IV) oxide, Holmium(III) oxide, Terbium, Oxides, Terbium compounds
Collection: Inorganic Compound Stubs, Oxides, Sesquioxides, Terbium Compounds
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Terbium(III) oxide

Terbium(III) oxide
IUPAC name
terbium(III) oxide
Other names
terbium trioxide, terbia, terbium sesquioxide
EC number 234-849-5
Jmol-3D images Image
Molar mass 365.85 g·mol−1
Appearance white crystals
Density 7.91 g/cm3
Melting point 2,410 °C (4,370 °F; 2,680 K)
0.07834 cm3/mol
Cubic, cI80
Ia-3, No. 206[1]
not listed
Related compounds
Other anions
Terbium(III) chloride
Other cations
Gadolinium(III) oxide
Dysprosium(III) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 Y  (: Y/N?)

Terbium(III) oxide, also known as terbium sesquioxide, is a sesquioxide of the rare earth metal terbium, having chemical formula Tb
. It is a p-type semiconductor when doped with calcium,[2] and may be prepared by the reduction of Tb
in hydrogen at 1300 °C for 24 hours.[3]

It is a p-type semiconductor.[4]

It is a basic oxide and easily dissolved to dilute acids, and then almost colourless terbium salt is formed.

Tb2O3 + 6 H+ → 2 Tb3+ + 3 H2O

The crystal structure is cubic and the lattice constant is a = 1057 pm.[5]


  1. ^ Curzon A.E., Chlebek H.G. (1973). "The observation of face centred cubic Gd, Tb, Dy, Ho, Er and Tm in the form of thin films and their oxidation". J. Phys. F 3 (1): 1–5.  
  2. ^ Reidar Haugsrud, Yngve Larring, and Truls Norby (December 2005). "Proton conductivity of Ca-doped Tb
    ". Solid State Ionics (Elsevier B.V.) 176 (39–40): 2957–2961.  
  3. ^ G. J. McCarthy (October 1971). "Crystal data on C-type terbium sesquioxide (Tb
    )". Journal of Applied Crystallography 4 (5): 399–400.  
  4. ^ Reidar Haugsrud, Yngve Larring, and Truls Norby (December 2005). "Proton conductivity of Ca-doped Tb2O3". Solid State Ionics (Elsevier B.V.) 176 (39-40): 2957–2961.  
  5. ^ N. C. Baenzinger, H. A. Eick, H. S. Schuldt, L. Eyring: Terbium Oxides. III. X-Ray Diffraction Studies of Several Stable Phases. In: Journal of the American Chemical Society, 1961, 83, 10, S. 2219-23.

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