Synthesis and X-Ray Diffraction Study of Potassium, Rubidium, and Cesium Polytungstates with Defect Pyrochlore and Hexagonal Tungsten Bronze Structures.-X-ray studies on the phase formation in M 2 WO 4 -WO 3 systems (M: K, Rb, Cs) verify the formation ofCs 6 W 11 O 36 and the existence of M 4 W 11 O 35 and M 2 W 7 O 22 phases. M 2 W 3 O 10 and Cs 6 W 11 O 36 possess a pyrochlore type structure whilst the structure of M 4 W 11 O 35 and M 2 W 7 O 22 resembles hexagonal tungsten bronze. Appropriate conditions for the solid phase synthesis and crystallization of discrete polytungtates from the corresponding alkali carbonate M 2 CO 3 and WO 3 are established. -(SOLODOVNIKOV, S. F.; IVANNIKOVA, N. V.; SOLODOVNIKOVA, Z. A.; ZOLOTOVA, E. S.; Neorg.

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