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Abstract The first alkaline‐earth metal tin(II) phosphate, BaSn 2 (PO 4 ) 2 , has been discovered, which consists of layered structures constructed from strictly alternating SnO 3 4− and PO 4 3− moieties. This compound is expected to have a large birefringence with Δ n ≈0.071 at 1064 nm, owing to the presence of stereochemically active lone pair metal cations.
Yang et al. (Mon,) studied this question.