Synthesis and magnetic structure of the layered manganese oxide selenide Sr2MnO2Ag1.5Se2

被引：7
作者：
Blandy, Jack N. [1 ,2 ]
Boskovic, Jelena C. [1 ]
Clarke, Simon J. [1 ]
机构：
[1] Univ Oxford, Dept Chem, Inorgan Chem Lab, South Parks Rd, Oxford OX1 3QR, England
[2] Diamond Light Source Ltd, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2017年 / 245卷
基金：
英国工程与自然科学研究理事会;
关键词：
Oxychalcogenide; Oxide selenide; Magnetic order; A-type magnetic structure; OXYSULFIDES; TRANSITION; CHEMISTRY; SR; BA;
D O I：
10.1016/j.jssc.2016.10.010
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The synthesis of a high-purity sample of the layered oxide selenide Sr2MnO2Ag1.5Se2 is reported. At ambient temperature it crystallises in the space group I4/mmm with two formula units in the unit cell and lattice parameters a=4.08771(1) angstrom, c=19.13087(8) angstrom. The compound displays mixed-valent manganese in a formal oxidation state close to +2.5 and powder neutron diffraction measurements reveal that below the Neel temperature of 63(1) K this results in an antiferromagnetic structure which may be described as A-type, modelled in the magnetic space group P(I)4/mnc (128.410 in the Belay, Neronova and Smirnova (BNS) scheme) in which localised Mn moments of 3.99(2) mu(B) are arranged in ferromagnetic layers which are coupled antiferromagnetically. In contrast to the isostructural compound Sr2MnO2Cu1.5S2, Sr2MnO2Ag1.5Se2 does not display long range ordering of coinage metal ions and vacancies, nor may significant amounts of the coinage metal readily be deintercalated using soft chemical methods.
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页码：61 / 66
页数：6
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