Crystal Structure and Coordination of B-Cations in the Ruddlesden-Popper Phases Sr3-xPrx(Fe1.25Ni0.75)O7- (0 x 0.4)

被引：2
作者：
Svensson, Gunnar [1 ]
Samain, Louise [1 ]
Biendicho, Jordi Jacas [1 ,2 ,3 ]
Mahmoud, Abdelfattah [4 ]
Hermann, Raphael P. [5 ]
Istomin, Sergey Ya. [6 ]
Grins, Jekabs [1 ]
机构：
[1] Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden
[2] Catalonia Inst Energy Res, Jardins Dones Negre 1, St Adria De Besos 08930, Spain
[3] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[4] Univ Liege, Inst Phys, Inst Chem B63APTIS, GREENMAT, B-4000 Liege, Belgium
[5] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[6] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia
来源：
INORGANICS | 2018年 / 6卷 / 03期
基金：
瑞典研究理事会;
关键词：
Ruddlesden-Popper structure; oxygen non-stoichiometry; crystal structure; Mossbauer spectroscopy; electrical conductivity; thermal expansion;
D O I：
10.3390/inorganics6030089
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Compounds Sr3-xPrxFe1.25Ni0.75O7- with 0 x 0.4 and Ruddlesden-Popper n = 2 type structures were synthesized and investigated by X-ray and neutron powder diffraction, thermogravimetry, and Mossbauer spectroscopy. Both samples, prepared at 1300 degrees C under N-2(g) flow and samples subsequently air-annealed at 900 degrees C, were studied. The structures contained oxygen vacancies in the perovskite layers, and the Fe/Ni cations had an average coordination number less than six. The oxygen content was considerably higher for air-annealed samples than for samples prepared under N-2, 7 - = similar to 6.6 and similar to 5.6 per formula unit, respectively. Mossbauer data collected at 7 K, below magnetic ordering temperatures, were consistent with X-ray powder diffraction (XRD) and neutron powder diffraction (NPD) results. The electrical conductivity was considerably higher for the air-annealed samples and was for x = 0.1 similar to 30 Scm(-1) at 500 degrees C. The thermal expansion coefficients were measured in air between room temperature and 900 degrees C and was found to be 20-24 ppmK(-1) overall.
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页数：16
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