K7P2W17LnO61 (330 mg) and 40 mg of KAc were dissolved in 20 ml of deionized water (pH 6.5) without further pH control. CTAB (79 mg) and 69 mg of TBAB were dissolved in 15 ml of chloroform. The organic phase was added dropwise into the POM solution under vigorous stirring. After 1 hour, the mixture was centrifuged at 10,000 rpm for 5 min, and the organic phase was collected. The clear solution was evaporated under ambient condition. The product was obtained as powder (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd).

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