Growth and characterization of large high quality brownmillerite CaFeO2.5 single crystals

被引：24

作者：

Ceretti, Monica ^{[1
,2
]}

Piovano, Andrea ^{[3
,4
,5
]}

Cousson, Alain ^{[6
]}

Berthier, Tanguy ^{[2
,3
,4
]}

Meven, Martin ^{[7
]}

Agostini, Giovanni ^{[3
,4
]}

Schefer, Jurg ^{[8
]}

Hernandez, Olivier ^{[2
]}

Lamberti, Carlo ^{[3
,4
]}

Paulus, Werner ^{[1
,2
]}

机构：

[1] Univ Montpellier 2, UMR 5253, C2M, ICGM,CC1504, F-34095 Montpellier, France

[2] Univ Rennes 1, CNRS, UMR 6226, F-35042 Rennes, France

[3] Univ Turin, Dept Chem, NIS Ctr Excellence, I-10125 Turin, Italy

[4] Univ Turin, INSTM Unit, I-10125 Turin, Italy

[5] ILL Grenoble, F-38042 Grenoble, France

[6] CEA Saclay, LLB, F-91191 Gif Sur Yvette, France

[7] Tech Univ Munich, FRM 2, Munich, Germany

[8] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

来源：

CRYSTENGCOMM | 2012年 / 14卷 / 18期

关键词：

NEUTRON-DIFFRACTION; POLI-HEIDI; IN-SITU; TEMPERATURE; CA2FE2O5; DIFFRACTOMETER;

D O I：

10.1039/c2ce25413a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The growth conditions of large and high quality single-crystals of CaFeO2.5 by the floating-zone technique in an image furnace are discussed. Structural characterization of the as grown single crystals have been carried out by neutron and X-ray diffraction as well as by HRTEM revealed the excellent quality in terms of composition homogeneity and crystalline quality. Magnetic measurements have been performed on oriented crystals by SQUID and neutron diffraction in the range of 5-700 K in order to clear up controversial discussions on possible magnetic phase transitions. The magnetic transitions reported elsewhere are discussed in terms of oxygen non-stoichiometries leading to multiphase CaFeO2.5 +/-delta related to the crystal growth conditions.

引用

页码：5771 / 5776

页数：6

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