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Aksenov SM, Borovikova EY, Mironov VS, Yamnova NA, Volkov AS, Ksenofontov DA, Gurbanova OA, Dimitrova OV, Deyneko DV, Zvereva EA, Maximova OV, Krivovichev SV, Burns PC, Vasiliev AN. Rb 2CaCu 6(PO 4) 4O 2, a novel oxophosphate with a shchurovskyite-type topology: synthesis, structure, magnetic properties and crystal chemistry of rubidium copper phosphates. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2019; 75:903-913. [PMID: 32830770 DOI: 10.1107/s2052520619008527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 06/14/2019] [Indexed: 06/11/2023]
Abstract
Single crystals of Rb2CaCu6(PO4)4O2 were synthesized by a hydrothermal method in the multicomponent system CuCl2-Ca(OH)2-RbCl-B2O3-Rb3PO4. The synthesis was carried out in the temperature range from 690 to 700 K and at the general pressure of 480-500 atm [1 atm = 101.325 kPa] from the mixture in the molar ratio 2CuO:CaO:Rb2O:B2O3:P2O5. The crystals studied by single-crystal X-ray analysis were found to be monoclinic, space group C2, a = 16.8913 (4), b = 5.6406 (1), c = 8.3591 (3) Å, β = 93.919 (3)°, V = 794.57 (4) Å3. The crystal structure of Rb2CaCu6(PO4)4O2 is similar to that of shchurovskyite and dmisokolovite and is based upon a heteropolyhedral open framework formed by polar layers of copper polyhedra linked via isolated PO4 tetrahedra. The presence of well-isolated 2D heteropolyhedral layers in the title compound suggests low-dimensional magnetic behavior which is masked, however, by the fierce competition between multiple ferromagnetic and antiferromagnetic exchange interactions. At TC = 25 K, Rb2CaCu6(PO4)4O2 reaches a magnetically ordered state with large residual magnetization.
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Affiliation(s)
- Sergey M Aksenov
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | | | - Vladimir S Mironov
- Institute of Crystallography of FSRC `Crystallography and Photonics', RAS, Leninskii pr. 59, Moscow, 119333, Russian Federation
| | - Natalia A Yamnova
- Moscow State University, Vorobievy Gory, Moscow, 119991, Russian Federation
| | - Anatoly S Volkov
- Moscow State University, Vorobievy Gory, Moscow, 119991, Russian Federation
| | | | - Olga A Gurbanova
- Moscow State University, Vorobievy Gory, Moscow, 119991, Russian Federation
| | - Olga V Dimitrova
- Moscow State University, Vorobievy Gory, Moscow, 119991, Russian Federation
| | - Dina V Deyneko
- Moscow State University, Vorobievy Gory, Moscow, 119991, Russian Federation
| | - Elena A Zvereva
- Moscow State University, Vorobievy Gory, Moscow, 119991, Russian Federation
| | - Olga V Maximova
- Moscow State University, Vorobievy Gory, Moscow, 119991, Russian Federation
| | - Sergey V Krivovichev
- St Petersburg State University, University Embankment 7/9, St Petersburg, 199034, Russian Federation
| | - Peter C Burns
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Aksenov SM, Yamnova NA, Borovikova EY, Volkov AS, Ksenofontov DA, Dimitrova OV, Gurbanova OA, Deyneko DV, Dal Bo F, Burns PC. Bi 3(PO 4)O 3, the Simplest Bismuth(III) Oxophosphate: Synthesis, IR Spectroscopy, Crystal Structure, and Structural Complexity. Inorg Chem 2018; 57:6799-6802. [PMID: 29877690 DOI: 10.1021/acs.inorgchem.8b01195] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The bismuth(III) oxophosphate Bi3(PO4)O3 was obtained by hydrothermal synthesis. The unit cell has a = 5.6840(6) Å, b = 7.0334(7) Å, c = 9.1578(9) Å, α = 78.958(2)°, β = 77.858(2)°, γ = 68.992(2)°, V = 331.41(6) Å3, space group P1̅, and Z = 2. The crystal chemical formula that reflects the presence of oxo-centered tetrahedra and triangles is 2D[OIIIOIV2Bi3](PO4). The crystal structure contains [O3Bi3]3+∞∞-heteropolyhedral corrugated layers parallel to (001), which alternate along [001] with isolated (PO4) tetrahedra. The structural complexity parameters are v = 22 atoms, IG = 3.459 bits/atoms, and IG,total = 76.107 bits/unit cell, and thus Bi3(PO4)O3 is the simplest pure bismuth(III) oxophosphate.
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