LaH2On3

LaH2On3 is a proposed lanthanum-based compound intended to represent a mixed hydride-oxide solid containing lanthanum, hydrogen, and oxygen. The notation is uncommon in standard chemical databases, and the exact stoichiometry is not universally defined; in many discussions the “n” is treated as a variable, making LaH2On3 a member of mixed-anion lanthanum systems rather than a single fixed compound.

Composition and structure: The formula involves lanthanum, hydrogen, and oxygen, with the variable “n” indicating different oxygen-to-hydrogen ratios and resulting non-stoichiometric phases. If such a material were realized, the lattice would likely need to accommodate both hydride and oxide ions, potentially resembling fluorite- or perovskite-related frameworks seen in other rare-earth hydride-oxide systems. Defect chemistry and non-stoichiometry would be expected to strongly influence properties.

Synthesis and stability: Reports of synthesis are sparse. Hypothetical routes include high-temperature solid-state reactions of lanthanum oxide or lanthanum hydride precursors under controlled hydrogen partial pressure and oxygen activity. The material would likely be sensitive to air and moisture, requiring inert-atmosphere handling and careful characterization.

Characterization and potential properties: Characterization would rely on X-ray and neutron diffraction, spectroscopy, and microscopy to determine structure and composition. Electronic, magnetic, and hydrogen-storage properties are speculative and would depend on the exact H/O ratio and defect chemistry. Some researchers study mixed-anion lanthanum materials for tunable properties, but LaH2On3 remains largely theoretical.

See also: lanthanum hydrides; lanthanum oxides; hydride-oxide solid solutions.