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structure structure (solids and liquids) D 2000 -008Transformation of the Defective Layered Structure into the Three-Dimensional Perovskite Structure under High Pressure.-The possibility of the transformation from a layered to a three-dimensional structure by preparing RbLaSrNb 2 MO 9 (M: Mg, Cu, Zn) under ambient pressure and high pressure (5 GPa) is explored. The compounds are synthesized from Rb 2 CO 3 , La 2 O 3 , SrCO 3 , Nb 2 O 5 , and MO by use of two different routes. For M: Mg and Zn, high pressure is required to form a single phase and neither a layer structure nor three-dimensionality is induced under normal conditions. The Cu compound has the defective layered structure under normal conditions and a three-dimensional one at high pressure. -(BYEON, S.-H.; KIM, H.; YOON, J.-J.; DONG, Y.; YUN, H.; INAGUMA, Y.; ITOH, M.; Chem. Mater.