Abstract
The phase relations of several A5B10O30- and A6B10O30-type solid solutions were determined, where A=Ba, Pb, Sr, Ca, Na and K, and B=Nb and Ta. The tungsten-bronze(TB)phase was observed in a wide range of the A5B10O30-type niobates, though the end components for A=Ba, Sr, Ca are not of the TB structure. Substitution of Ta for Nb stabilizes the TB structure in the A5B10O30-type systems. Introduction of Na or K on the A site, which causes the compositional variation from A5B10O30- to A6B10O30-type, enhances the TB stability. The systems between A5B10O30 and A6B10O30 are almost entirely soluble in the TB structure. The ferroelectric strength follows the order Pb>Ba>Sr>Ca for the divalent A ion, 0>Na>K for the monovalent A ion (presumably in 12-coordinated site), and Nb<Ta for the pentavalent B ion, where 0 means the A5B10O30-type.
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