Abstract
The new compound Rb2CdSiO4 has been synthesized from Rb2CdO2 and SiO2 in the presence of excess Rb2O (typical molar ratio 1:1:2) under Ar atmosphere in a sealed Ag container at 330°C (40d). The twinned structure has been refined from X-ray single crystal data. Rb2CdSiO4 was found to crystallize in the space group C2221 (No. 20) with a=1142.6(2) pm, b=1102.3(1) pm, c=1672.5(2) pm. The lattice constants were refined from X-ray powder data. The crystal structure can be described as a stuffed derivative of the α-cristobalite modification of SiO2.
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