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Crystal structures of Sr 4 (Sr 2 Ta 2 )O 11 and Sr 4 (Sr 1.92 Ta 2.08 )O 11.12 , synthesized by solid state reaction technique in dry and hydrated state have been studied mainly using Transmission Electron Microscopy. Due to the lesser ability of X-rays to probe details in oxygen sublattice, the change in crystal symmetry due to ordering...
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