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The permeation of the rare earth element Sm to the heteropoly compound K 3 PW 12 O 40 using the rare earth gas phase-heated diffused permeation method at 550°C is reported for the first time. The studies of infrared spectroscopy (IR) and X-ray diffraction (XRD) indicate that the Keggin structure of the compound is destroyed. The bond of W–O–W is broken and tungsten bronze K...
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