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New compounds, KCuAl[PO4]2 (I) and K(Al,Zn)2[(P,Si)O4]2 (II), obtained hydrothermally, were studied by single-crystal X-ray diffraction. Based on its structure, (I) is a potentially electrochemically active material and/or possible low-temperature antiferromagnet. The phase (II) was established to be a product of epitaxial intergrowth of phosphate KAlZn[PO4]2 and silicate KAlSi[SiO4]2 components with close crystal structures, thus providing a single diffraction pattern.
