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Crystal structures of potassium-exchanged forms of catapleiite and hilairite

机译:凯普莱特石和硅钙石的钾交换形式的晶体结构

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The crystal structures of potassium-exchanged forms of catapleiite and hilairite of the compositions (K0.49Ca0.42Na0.26)ZrSi3O9 center dot 2[(H2O)(0.8)(H3O)(0.2)] and K0.51ZrSi3O9 center dot 3[(H2O)(0.5)K-0.27(H3O)(0.23)], respectively, were studied by X-ray diffraction and IR spectroscopy. Both structures retain the heteropolyhedral frameworks of the parent minerals formed by Zr octahedra and Si tetrahedra. The K cations occupy different positions in these minerals. In K-exchanged catapleiite, K cations are located only in the position occupied by Na in the structure of the parent mineral. In the K-exchanged form of hilairite, K cations are not only involved in the Na position but also partially occupy the H2O position.
机译:(K0.49Ca0.42Na0.26)ZrSi3O9中心点2 [(H2O)(0.8)(H3O)(0.2)]和K0.51ZrSi3O9中心点3 [ (H 2 O)(0.5)K-0.27(H 3 O)(0.23)]分别通过X射线衍射和IR光谱研究。两种结构都保留了由八面体Zr和四面体Si形成的母体矿物的杂多面体骨架。钾离子在这些矿物中占据不同的位置。在K交换的滑石中,K阳离子仅位于母体矿物结构中Na占据的位置。在硅钙石的K交换形式中,K阳离子不仅参与Na位置,而且部分占据H2O位置。

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