Abstract: A new compound of the Rb1.5(NH4)0.5{Cu(P2O7)} composition, obtained by the high-temperature reaction method from a mixture of RbNO3, Cu(NO3)2, and (NH4)4P2O7, has been studied using X-ray diffraction. This compound is crystallized in the orthorhombic system, sp. gr. Pnma, a = 15.146(3) Å, b = 5.183(1) Å, c = 10.096(2) Å, V = 792.6(3) Å3. The structure has been interpreted and refined to the final reliability factor R1 = 6.56% in the anisotropic approximation of atomic displacements, using 415I > 3σ(I). Rb1.5(NH4)0.5{Cu(P2O7)} belongs to the group of copper diorthophosphates of alkaline elements, described by the general formula A2+{Cu(P2O7)}. The basis of its crystal structure is a set of polar heteropolyhedral copper-phosphate layers of the {Cu(P2O7)}2–∞∞ composition, formed by vertex-sharing CuO5 pyramids and tetrahedral diorthogroups P2O7, which are linked via rubidium cations. Based on symmetry interlayer connections, one can predict a series of partially ordered structures using the following groupoid: λ-PO P(n)m21; σ-PO P121/m1 || Pсm21.

Original languageEnglish
Pages (from-to)239-246
Number of pages8
JournalCrystallography Reports
Issue number2
StatePublished - 23 May 2019

    Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

ID: 49248720