Lanthanum ytterbium oxide

Lanthanum ytterbium oxide
Identifiers
Properties
Chemical formula	LaYbO3
Molar mass	359.9577 g/mol
Appearance	white powder
Density	8.08 g/cm3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Lanthanum ytterbium oxide is a solid inorganic compound of lanthanum, ytterbium and oxygen with the chemical formula of LaYbO₃. This compound adopts the Perovskite structure.

Synthesis

LaYbO₃ is not a naturally occurring mineral but it can prepared by solid state reaction between La₂O₃ and 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 permittivity, ɛ_r, of ∼26, which decreases slightly to 25 at 10 K. LaYbO₃ shows 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).

References

Bharathy, M., Fox, A.H., Mugavero, S.J. and zur Loye, H.C., 2009. Crystal growth of inter-lanthanide LaLn′O₃ (Ln′= Y, Ho–Lu) perovskites from hydroxide fluxes. Solid State Sciences, 11(3), pp.651-654.
Ito, K., Tezuka, K. and Hinatsu, Y., 2001. Preparation, Magnetic Susceptibility, and Specific Heat on Interlanthanide Perovskites ABO₃ (A= La–Nd, B= Dy–Lu). Journal of Solid State Chemistry, 157(1), pp.173-179.

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[1] Bharathy, M., Fox, A.H., Mugavero, S.J. and zur Loye, H.C., 2009. Crystal growth of inter-lanthanide LaLn′O₃ (Ln′= Y, Ho–Lu) perovskites from hydroxide fluxes. Solid State Sciences, 11(3), pp.651-654.

[2] Ito, K., Tezuka, K. and Hinatsu, Y., 2001. Preparation, Magnetic Susceptibility, and Specific Heat on Interlanthanide Perovskites ABO₃ (A= La–Nd, B= Dy–Lu). Journal of Solid State Chemistry, 157(1), pp.173-179.