Jump to content

Terbium(III) oxide

From Wikipedia, the free encyclopedia
(Redirected from Terbia)
Terbium(III) oxide
Names
IUPAC name
terbium(III) oxide
Other names
terbium trioxide, terbia, terbium sesquioxide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.031.668 Edit this at Wikidata
EC Number
  • 234-849-5
  • InChI=1/3O.2Tb/q3*-2;2*+3
  • [O-2].[O-2].[O-2].[Tb+3].[Tb+3]
Properties
O3Tb2
Molar mass 365.848 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
Structure
Cubic, cI80
Ia3, No. 206[1]
a = 1.057 nm
Thermochemistry
156.90 J/mol·K [2]
-1865.23 kJ/mol [2]
-1776.553 kJ/mol [2]
Hazards
GHS labelling:
GHS07: Exclamation markGHS09: Environmental hazard
Warning
H319, H410
P264, P273, P280, P305+P351+P338, P337+P313, P391, P501
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).
checkY verify (what is checkY☒N ?)

Terbium(III) oxide, also known as terbium sesquioxide, is a sesquioxide of the rare earth metal terbium, having chemical formula Tb
2
O
3
. It is a p-type semiconductor, which conducts protons, which is enhanced when doped with calcium.[3] It may be prepared by the reduction of Tb
4
O
7
in hydrogen at 1300 °C for 24 hours.[4]

Tb4O7 + H2 → 2 Tb2O3 + H2O

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]

References

[edit]
  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. Bibcode:1973JPhF....3....1C. doi:10.1088/0305-4608/3/1/009.
  2. ^ a b c R. Robie, B. Hemingway, and J. Fisher, "Thermodynamic Properties of Minerals and Related Substances at 298.15K and 1bar Pressure and at Higher Temperatures," US Geol. Surv., vol. 1452, 1978.[1]
  3. ^ Reidar Haugsrud; Yngve Larring & Truls Norby (December 2005). "Proton conductivity of Ca-doped Tb
    2
    O
    3
    ". Solid State Ionics. 176 (39–40). Elsevier B.V.: 2957–2961. doi:10.1016/j.ssi.2005.09.030.
  4. ^ G. J. McCarthy (October 1971). "Crystal data on C-type terbium sesquioxide (Tb
    2
    O
    3
    )". Journal of Applied Crystallography. 4 (5): 399–400. doi:10.1107/S0021889871007295.
  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.