Two novel phases, potassium copper aluminium bis(phosphate), KCuAl[PO₄]₂ (I), and potassium zinc aluminium bis(phosphate‐silicate), K(Al,Zn)₂[(P,Si)O₄]₂ (II), were obtained in one hydrothermal synthesis experiment at 553 K. Their crystal structures have been studied using single‐crystal X‐ray diffraction. (I) is a new member of the A⁺M²⁺M³⁺[PO₄]₂ family. Its open 3D framework built by AlO₅ and PO₄ polyhedra includes small channels populated by columns of CuO₆ octahedra sharing edges, and large channels where K⁺ ions are deposited. It is assumed that the stability of this structure type is due to the pair substitution of Cu/Al with Ni/Fe, Co/Fe or Mg/Fe in different representatives of the series. From the KCuAl[PO₄]₂ structural features, one may suppose it is a potentially electrochemically active material and/or possible low‐temperature antiferromagnet. In accordance with results obtained from X‐ray diffraction data, using scanning electron microscopy, microprobe analysis and detailed crystal chemical observation, (II) is considered as a product of epitaxial intergrowth of phosphate KAlZn[PO₄]₂ and silicate KAlSi[SiO₄]₂ components having closely similar crystal structures. The assembly of `coherent intergrowth' is described in the framework of a single diffraction pattern.

中文翻译：

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KCuAl [PO4] 2和K（Al，Zn）2 [（P，Si）O4] 2的联合结晶：晶体化学和磷酸盐-硅酸盐外延异质结构的形成机理。

两个新颖的相，钾铜铝双（磷酸盐），KCuAl [PO ₄ ] ₂（I）和钾锌铝双（磷酸盐-硅酸盐），K（Al，Zn）₂ [（P，Si）O ₄ ] ₂（II）是在一个553 K的水热合成实验中获得的。它们的晶体结构已使用单晶X射线衍射进行了研究。（I）是A ⁺ M ²⁺ M ³⁺ [PO ₄ ] ₂家族的新成员。由AlO ₅和PO ₄多面体构建的开放式3D框架包括由CuO ₆列填充的小通道八面体共享边，并形成大通道，其中沉积K ⁺离子。假定该结构类型的稳定性是由于在该系列的不同代表中用Ni / Fe，Co / Fe或Mg / Fe对Cu / Al的成对取代。从KCuAl [PO ₄ ] _2的结构特征来看，它可能是一种潜在的电化学活性材料和/或可能的低温反铁磁体。根据从X射线衍射数据获得的结果，使用扫描电子显微镜，微探针分析和详细的晶体化学观察，（II）被认为是磷酸盐KAlZn [PO ₄ ] ₂和硅酸盐KAlSi [SiO ₄的外延共生产物。] ₂具有紧密相似的晶体结构的组分。“相干共生”的组装在单个衍射图样的框架中描述。