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Terbium(III) oxide
Encyclopedia
Terbium oxide, also known as terbium sesquioxide, is a sesquioxide
of the rare earth metal terbium
, having chemical formula
. It is a p-type semiconductor
when doped with calcium
, and may be prepared by the reduction of
in hydrogen
at 1300 °C for 24 hours.
It is a p-type semiconductor
.
It is a basic oxide and easily dissolved to dilute acids, and then almost colourless terbium salt is formed.
The crystal structure is cubic
and the lattice constant
is a = 1057 pm.
Sesquioxide
A sesquioxide is an oxide containing three atoms of oxygen with two atoms of another element. For example, aluminium oxide is a sesquioxide.Many sesquioxides contain the metal in the +3 oxidation state and the oxide ion, e.g., Al2O3, La2O3...
of the rare earth metal terbium
Terbium
Terbium is a chemical element with the symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife...
, having chemical formula
Chemical formula
A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound....
. It is a p-type semiconductor
Semiconductor
A semiconductor is a material with electrical conductivity due to electron flow intermediate in magnitude between that of a conductor and an insulator. This means a conductivity roughly in the range of 103 to 10−8 siemens per centimeter...
when doped with calcium
Calcium
Calcium is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft gray alkaline earth metal, and is the fifth-most-abundant element by mass in the Earth's crust...
, and may be prepared by the reduction of
Terbium(III,IV) oxide
Terbium 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...
in hydrogen
Hydrogen
Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly...
at 1300 °C for 24 hours.
It is a p-type semiconductor
Semiconductor
A semiconductor is a material with electrical conductivity due to electron flow intermediate in magnitude between that of a conductor and an insulator. This means a conductivity roughly in the range of 103 to 10−8 siemens per centimeter...
.
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
Cubic
Cubic may refer to:-Science and mathematics:* Cube , "cubic" measurement* Cube, a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex...
and the lattice constant
Lattice constant
The lattice constant [or lattice parameter] refers to the constant distance between unit cells in a crystal lattice. Lattices in three dimensions generally have three lattice constants, referred to as a, b, and c. However, in the special case of cubic crystal structures, all of the constants are...
is a = 1057 pm.