In:
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, International Union of Crystallography (IUCr), Vol. 75, No. 5 ( 2019-10-01), p. 903-913
Abstract:
Single crystals of Rb 2 CaCu 6 (PO 4 ) 4 O 2 were synthesized by a hydrothermal method in the multicomponent system CuCl 2 –Ca(OH) 2 –RbCl–B 2 O 3 –Rb 3 PO 4 . 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:Rb 2 O:B 2 O 3 :P 2 O 5 . The crystals studied by single-crystal X-ray analysis were found to be monoclinic, space group C 2, a = 16.8913 (4), b = 5.6406 (1), c = 8.3591 (3) Å, β = 93.919 (3)°, V = 794.57 (4) Å 3 . The crystal structure of Rb 2 CaCu 6 (PO 4 ) 4 O 2 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 PO 4 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 T C = 25 K, Rb 2 CaCu 6 (PO 4 ) 4 O 2 reaches a magnetically ordered state with large residual magnetization.
Type of Medium:
Online Resource
ISSN:
2052-5206
DOI:
10.1107/S2052520619008527
DOI:
10.1107/S2052520619008527/ra5054sup1.cif
DOI:
10.1107/S2052520619008527/ra5054Isup2.hkl
DOI:
10.1107/S2052520619008527/ra5054sup3.pdf
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2019
detail.hit.zdb_id:
2020841-8
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