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High‐pressure ion exchange of small‐pore zeolite K‐natrolite allows immobilization of nominally non‐exchangeable aliovalent cations such as trivalent europium. A sample exchanged at 3.0(1) GPa and 250 °C contains about 4.7 EuIII ions per unit cell, which is equivalent to over 90 % of the K+ cations being exchanged (see picture).
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