• Top library match: oxygen(-2) anion; yttrium(+3) cation #75964

• All top library candidates have similarity values of 0.000, S-O the library search does not provide positive match support for a specific material.
• The Top-15 candidates span unrelated chemistries, including inorganic salts, organotin, polyethylene, acids, and aromatic compounds, indicating poor specificity.
• No related-literature evidence was recovered to confirm a distinct compound class.
• The library direction suggestion of oxygen heterocycle / methyl is not well supported by the actual peak set, which lacks clear characteristic C-H stretching and fingerprint evidence for a methyl-substituted organic heterocycle.
• It remains unclear whether the sample is primarily an inorganic oxide/hydroxide, a hydrated surface, or a mixed material carrying adsorbed moisture.
• The origin of the 1540 cm-1 band is not securely established from the available evidence.
• The 2306 and 2355 cm-1 features may be environmental CO2 rather than intrinsic sample bands.
• Without stronger fingerprint-region agreement or corroborating reference data, the specific library hit cannot be treated as an identification.

Recommended next steps: Recollect the FTIR spectrum after improved background subtraction and control of atmospheric H2O/CO2 to test whether the 2306, 2355, 3435, and 1650 cm-1 bands decrease. Dry or heat the sample gently under vacuum or dry gas, then remeasure to determine whether the hydroxyl/water bands are due to adsorbed moisture or structural O-H groups. Obtain a broader and cleaner fingerprint-region spectrum below 1000 cm-1, since inorganic oxide and lattice assignments often depend on that region. If yttrium oxide or another metal oxide is suspected from sample context, confirm with elemental methods such as XRF, EDS, or XPS rather than relying on this FTIR search alone.