Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4-δ (M = Fe, Mn)

被引：12

作者：

El Shinawi, H. ^{[1
]}

Marco, J. F. ^{[3
]}

Berry, F. J. ^{[1
,2
]}

Greaves, C. ^{[1
]}

机构：

[1] Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England

[2] Open Univ, Dept Chem, Milton Keynes MK7 6AA, Bucks, England

[3] CSIC, Inst Quim Fis Rocasolano, E-28006 Madrid, Spain

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 08期

关键词：

Ruddlesden-Popper; Oxygen-deficient; Neutron powder diffraction; Mossbauer spectroscopy; Magnetic order; OXYGEN; OXIDES; SERIES;

D O I：

10.1016/j.jssc.2009.06.010

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The M4+-containing K2NiF4-type phases La0.8Sr1.2Co0.5Fe0.5O4 and La0.8Sr1.2Co0.5Mn0.5O4 have been synthesized by a sol-gel procedure and characterized by X-ray powder diffraction, thermal analysis, neutron powder diffraction and Mossbauer spectroscopy. Oxide ion vacancies are created in these materials via reduction of M4+ to M3+ and of Co3+ to Co2+. The vacancies are confined to the equatorial planes of the K2NiF4-type structure. A partial reduction of Mn3+ to Mn2+ also occurs to achieve the oxygen stoichiometry in La0.8Sr1.2Co0.5Mn0.5O3.6. La0.9Sr1.2Co0.5Fe0.5O3.65 contains Co2+ and Fe3+ ions which interact antiferromagnetically and result in noncollinear magnetic order consistent with the tetragonal symmetry. Competing ferromagnetic and antiferromagnetic interactions in La0.8Sr1.2Co0.5Fe0.5O4, La0.8Sr1.2Co0.5Mn0.5O4 and La0.8Sr1.2Co0.5Mn0.5O3.6 induce spin glass properties in these phases. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：2261 / 2268

页数：8

共 16 条

[1]

[Anonymous], 1992, NEUTRON NEWS, V3, P29, DOI DOI 10.1080/10448639208218770

[2] Three-coordinate metal centers in extended transition metal oxides [J].

Bowman, Amy ;

Allix, Mathieu ;

Pelloquin, Denis ;

Rosseinsky, Matthew J. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (39) :12606-12607

[3] Large oxygen deficiency in a n=2 member of the RP series:: Sr3FeCoO7-x (x≤1.55) [J].

Bréard, Y ;

Michel, C ;

Hervieu, M ;

Studer, F ;

Maignan, A ;

Raveau, BB .

CHEMISTRY OF MATERIALS, 2002, 14 (07) :3128-3135

[4] Determination of B-site ordering and structural transformations in the mixed transition metal perovskites La2CoMnO6 and La2NiMnO6 [J].

Bull, CL ;

Gleeson, D ;

Knight, KS .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2003, 15 (29) :4927-4936

[5] STRUCTURE AND OXYGEN STOICHIOMETRY IN SR3FE2O7-Y'0-LESS-THAN-OR-EQUAL-TO-Y-LESS-THAN-OR-EQUAL-TO-1.0 [J].

DANN, SE ;

WELLER, MT ;

CURRIE, DB .

JOURNAL OF SOLID STATE CHEMISTRY, 1992, 97 (01) :179-185

[6] Synthesis and characterization of the K2NiF4 phases La1+xSr1-xCo0.5Fe0.5O4-δ (x=0, 0.2) [J].

El Shinawi, H. ;

Greaves, C. .

JOURNAL OF SOLID STATE CHEMISTRY, 2008, 181 (10) :2705-2712

[7] Anion vacancy distribution and magnetism in the new reduced layered Co(II)/Co(I) phase LaSrCoO3.5-x [J].

Hayward, MA ;

Rosseinsky, MJ .

CHEMISTRY OF MATERIALS, 2000, 12 (08) :2182-2195

[8] An unusual magnetic structure in Sr2FeO3F and magnetic structures of K2NiF4-type iron(III) oxides and oxide halides, including the cobalt substituted series Sr2Fe1-xCoxO3Cl [J].

Hector, AL ;

Knee, CS ;

MacDonald, AI ;

Price, DJ ;

Weller, MT .

JOURNAL OF MATERIALS CHEMISTRY, 2005, 15 (30) :3093-3103

[9] Local defect structure of Sr3Co2Ox (5.64≤x≤6.60):: Evolution of crystallographic and magnetic states [J].

Hill, J. M. ;

Dabrowski, B. ;

Mitchell, J. F. ;

Jorgensen, J. D. .

PHYSICAL REVIEW B, 2006, 74 (17)

[10] YBaMnCoO5;: neither valence mixed nor charge ordered [J].

Karen, P ;

Suard, E ;

Fauth, F ;

Woodward, PM .

SOLID STATE SCIENCES, 2004, 6 (11) :1195-1204

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