oxideide

Oxideide is a term used in some discussions of inorganic chemistry and materials science to describe a class of compounds that combine oxide units with an additional anionic component. It is not a fixed chemical species, and there is no universally accepted definition. In practice, oxideide is used in two related ways: (1) as a label for mixed-anion materials in which an oxide framework coexists with a second anion occupying distinct lattice sites, and (2) as a label for coordination complexes in which oxide ligands are joined by other anionic ligands that tune electronic structure or charge transport.

A second usage emphasizes the simultaneous presence of oxide and non-oxide components within a single material. In many speculative models, oxideide compounds would feature interwoven oxide networks with a secondary anion that modulates bonding, lattice parameters, and electron density. Halide and chalcogenide secondary anions are commonly discussed, but there is no single standard set of compositions.

Properties of oxideide materials are speculative and depend on the second anion and structure. Some proposals envision tunable band gaps, enhanced ionic or electronic conductivity, and novel redox behavior arising from interactions between the oxide framework and the secondary anion.

Synthesis approaches include solid-state reactions between oxide precursors and sources of the secondary anion, high-temperature diffusion processes, and thin-film deposition methods for mixed-anion oxides. Challenges include achieving phase-pure materials, controlling anion ordering, and ensuring stability against moisture and redox processes.

As of now, oxideide is not a standard term in major chemistry references; most discussions remain exploratory. See also mixed-anion compounds, oxides, perovskites, and halide oxides.