Abstract
Application of structural criteria presented previously, to all entries in the Inorganic Crystal Structure Database for materials crystallizing in space group Pba2, has led to the prediction of seven new ferroelectrics. These materials, with estimates of their respective predicted transition temperatures (To) to an assumed paraelectric phase, are: Na~3Nb35094 (340 K), K3FesF15 (535K), Mo17047 (1750K), Bi3NblTO47 (500 K), Ba~sPr38TiT202~ 6 (650K), K3Sb50~4 (340K) and CaEGeTO~6 (close to room temperature if the structure determination is correct). Experimental confirmation has now been made for two of these predictions, with a T c of 320 (10)K found in Na13Nb35094 and 490 (10) K found in K3Fe5F~5. Five of the newly predicted ferroelectrics are related to the tetragonal-bronze structure.
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