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backup of oxypnictide by Stone before edit failed. In chemistry, oxypnictides are a class of materials including oxygen, a pnictogen (group-V, especially phosphorus and arsenic) and one or more other elements.

The interest in this group of compounds results from the superconducting properties which were discovered 2006 and 2008.

Structure
For example LaOFeP has a layered structure with layers of La3+02- and Fe2+P3-.

Superconductor
The first superconducting iron oxypnictide was discovered in 2006, based on phosphorus. A drastic increase in the critical temperature was achieved when phosphorus was substituted by arsenic. This discovery boosted the search for similar compounds, like the search for cuprate-based superconductors after their discovery in 1986.

Some found in 2008 to be high temperature superconductors (at 43 K) of composition ReOTmPn where Re is a rare earth, Tm is a transition metal and Pn is from group-V eg As.

Tests at up to 45 Tesla suggest the upper critical field of LaFeAsO0.89F0.11 may be around 64 Tesla.