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

Sergey M. Aksenov; Elena Yu. Borovikova; Vladimir S. Mironov; Natalia A. Yamnova; Anatoly S. Volkov; Dmitry A. Ksenofontov; Olga A. Gurbanova; Olga V. Dimitrova; Dina V. Deyneko; Elena A. Zvereva; Olga V. Maximova; Sergey V. Krivovichev; Peter C. Burnsa; Alexander N. Vasilievc

首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >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

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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

机译：RB_2CACU_6（PO_4）_4O_2，一种具有Shchurovskyity型拓扑的新型甲磷酸酯：铷磷酸盐的合成，结构，磁性和晶体化学

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Single crystals of Rb_2CaCu_6(PO_4)_4O_2 were synthesized by a hydrothermal method in the multicomponent system CuCl_2-Ca(OH)_2-RbCl-B_2O_3-Rb_3PO_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_2O:B_2O_3:P_2O_5. The crystals studied by singlecrystal X-ray analysis were found to be monoclinic, space group C2, a = 16.8913 (4), b = 5.6406 (1), c = 8.3591 (3) ? , β = 93.919 (3)°, V = 794.57 (4) ?~3. The crystal structure of Rb_2CaCu_6(PO_4)_4O_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_2CaCu_6(PO_4)_4O_2 reaches a magnetically ordered state with large residual magnetization.

机译：通过多组分系统CuCl_2-Ca（OH）_2-RBCL-B_2O_3-RB_3PO_4中的水热法合成RB_2CACU_6（PO_4）_4O_2的单晶。该合成在690至700k的温度范围内，从摩尔比的混合物中，在480-500atm [1atm = 101.325kPa]的一般压力下，在摩尔比例2cuo：caO：Rb_2O：B_2O_3：P_2O_5。发现通过单晶X射线分析研究的晶体是单斜斜，空间组C2，A = 16.8913（4），B = 5.6406（1），C = 8.3591（3）？，β= 93.919（3）°，v = 794.57（4）？〜3。 RB_2CACU_6（PO_4）_4O_2的晶体结构类似于Shchurovskyite和Dmisokolovite的结构，并且基于通过通过隔离的Po_4 Tetrahedra连接的铜多面体的极性层形成的杂多肾上腺开放框架。标题化合物中脱离的2D杂肾上腺层的存在表明，通过多种铁磁和反铁磁交换相互作用之间的激烈竞争，掩盖的低维磁性行为。在T_C = 25K，RB_2CACU_6（PO_4）_4O_2达到具有大残余磁化的磁有序状态。

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《Acta Crystallographica, Section B. Structural science, crystal engineering and materials》 |2019年第5期|共11页
作者
Sergey M. Aksenov; Elena Yu. Borovikova; Vladimir S. Mironov; Natalia A. Yamnova; Anatoly S. Volkov; Dmitry A. Ksenofontov; Olga A. Gurbanova; Olga V. Dimitrova; Dina V. Deyneko; Elena A. Zvereva; Olga V. Maximova; Sergey V. Krivovichev; Peter C. Burnsa; Alexander N. Vasilievc;
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Department of Civil and Environmental Engineering and Earth Sciences University of Notre Dame Notre Dame Indiana 46556 USA;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Institute of Crystallography of FSRC 'Crystallography and Photonics' RAS Leninskii pr. 59 Moscow 119333 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

Moscow State University Vorobievy Gory Moscow 119991 Russian Federation;

St Petersburg State University University Embankment 7/9 St Petersburg 199034 Russian Federation;

Department of Chemistry and Biochemistry University of Notre Dame Notre Dame IN 46556 USA.;

National University of Science and Technology 'MISiS' Leninskii pr. 4 Moscow 119049 Russian Federation;

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正文语种 eng
中图分类晶体学;
关键词
hydrothermal synthesis; copper oxophosphate; shchurovskyite; single-crystal X-ray diffraction; IR spectroscopy; structural complexity; magnetic properties;

机译：水热合成;氧化铜;Shchurovskykity;单晶X射线衍射;IR光谱;结构复杂;磁性;

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1. 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 [J] . Sergey M. Aksenov, Elena Yu. Borovikova, Vladimir S. Mironov, Acta Crystallographica, Section B. Structural science, crystal engineering and materials . 2019,第5期

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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

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