Lanthanum ytterbium oxide
| Identifiers | |
|---|---|
3D model (
JSmol ) |
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| Properties | |
| LaYbO3 | |
| Molar mass | 359.9577 g/mol |
| Appearance | white powder |
| Density | 8.08 g/cm3 |
| Related compounds | |
Other anions
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Lanthanum aluminate Lanthanum manganite |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Lanthanum ytterbium oxide is a solid inorganic compound of
perovskite structure
.
Synthesis
LaYbO3 is not a naturally occurring
Yb2O3 at temperatures around 1200 °C. Single-crystals of LaYbO3 can also be grown of a molten hydroxide flux at 750 °C in sealed silver tubes.[1] Thin films of LaYbO3 have also been fabricated by pulsed laser deposition
.
Structure
LaYbO3 and other LaREO3 oxides (where RE=Ho, Y, Er, Tm, Yb, and Lu) compounds have an
orthorhombic crystal structure with an internal symmetry described by the Pnma space group
. The structure can be described by slightly distorted YbO6 octahedra tilted in the a−b+a− configuration according to Glazer's notation and antiparallel displaced La3+ ions. The rotation of the YbO6 octahedra reduces the coordination number of the La from 12 to 8.
It exhibits exhibit a negative thermal expansion along the a and b axes.
Physical properties
LaYbO3 exhibits a room-temperature
antiferromagnetic ordering with a weak ferromagnetism at 2.7 K.[2]
LaYbO3-based perovskites are also known to show proton conductivity at intermediate temperatures (600-800 °C).