NDLI: The effect of the B-site cation and oxygen stoichiometry on the local and average crystal and magnetic structures of Sr2Fe1.9M0.1O5+y (M = Mn, Cr, Co; y = 0, 0.5)

Content Provider	Royal Society of Chemistry (RSC)
Author	Cranswick, Lachlan M. D. Llobet, Anna Greedan, John E. Donaberger, Ronald L. Ramezanipour, Farshid Siewenie, Joan Garlea, V. Ovidiu King, Graham
Copyright Year	2012
Abstract	Six compounds with formula Sr2Fe1.9M0.1O5+y (M = Mn, Cr, Co; y = 0, 0.5) were synthesized in air and argon, exhibiting surprisingly different properties depending on the B-cation type in spite of the low (5%) doping level. All argon synthesized phases, y ∼ 0, have long range brownmillerite ordering of oxygen vacancies with Icmm symmetry as shown by neutron diffraction (ND). All show long-range G-type antiferromagnetic order with Néel temperatures, TN, from variable temperature ND of 649(3)K, 636(2)K and 668(5)K for Cr, Mn and Co-compounds, respectively, compared with Sr2Fe2O5, TN = 693 K. Competing ferromagnetic interactions may be responsible for the anomalously low value in the M = Mn case. The air synthesized phases with y ∼ 0.5 show surprising variation with M as investigated by X-ray, TOF and constant wavelength neutron diffractions. The M = Co compound is isostructural with Sr4Fe4O11 (Sr2Fe2O5.5), Cmmm, while the M = Cr phase is cubic, Pm-3m, and that for M = Mn appears to be cubic but the reflections are systematically broadened in a manner which suggests a local Cmmm structure. NPDF studies show that the local structure of the Cr phase is better described in terms of a Cmmm ordering of oxygen vacancies with Fe–O coordination numbers of five and six. The M = Co material shows C-type antiferromagnetic long-range magnetic order at 4 K as found for Sr4Fe4O11. TN ∼ 230 K is inferred from a ZFC-FC magnetic susceptibility divergence compared with TN = 232 K for un-doped Sr4Fe4O11. The M = Cr and Mn compounds show no long-range magnetic ordering down to 4 K, but the divergence of ZFC and FC susceptibility data indicative of spin glass-like transitions occur at ∼60 K and ∼45 K for Cr and Mn, respectively. ND shows both diffuse and sharp Bragg magnetic reflections at positions consistent with a Cmmm cell for the M = Mn phase. For the M = Cr material, a very weak magnetic Bragg peak indexed as (1/2 1/2 1/2), consistent with a G-type AF order, is found at 4 K. These results rule out a spin glass-like ground state for both materials.
Starting Page	9522
Ending Page	9538
Page Count	17
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	19
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm30957b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	ND NPDF FC Argon Dopant Brownmillerite Oxygen Neutron diffraction Stellar classification Antiferromagnetism Ferromagnetism X-ray crystallography Wavelength Magnetic susceptibility Zermelo\u2013Fraenkel set theory Bragg peak
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Role of multivalent Cu, oxygen vacancies and CuO nanophase in the ferromagnetic properties of ZnO:Cu thin films

Magnetic Properties and Magnetic Phase Diagram of \ bcc Cr--Fe--Mn Alloys

Structural characterisation and spin glass behaviour of the new oxide Ba₂ScCoO₅

Absence of magnetic ordering in the ground state of a SrTm₂O₄ single crystal

Manipulation of the Ferromagnetism in LaCoO3 Thin Films Through Cation‐Stoichiometric Engineering

Antiferromagnetism and Weak Ferromagnetism of Disordered bcc V–Cr–Mn Ternary Alloys

Ferromagnetism and antiferromagnetism in disordered Ni-Mn alloys

Cation partitioning in ternary vanadium sulfides₂S₄ (A=Ti, Cr, Fe, Ni)

Crystal structure, thermal and magnetic properties of La₃Co₃O₈. Phase relations for LaCoO_3–δ (0.00≤δ≤0.50) at 673 K

The effect of the B-site cation and oxygen stoichiometry on the local and average crystal and magnetic structures of Sr₂Fe_1.9M_0.1O_5+y (M = Mn, Cr, Co; y = 0, 0.5)

Similar Documents

Role of multivalent Cu, oxygen vacancies and CuO nanophase in the ferromagnetic properties of ZnO:Cu thin films

Magnetic Properties and Magnetic Phase Diagram of \ bcc Cr--Fe--Mn Alloys

Structural characterisation and spin glass behaviour of the new oxide Ba2ScCoO5

Absence of magnetic ordering in the ground state of a SrTm2O4 single crystal

Manipulation of the Ferromagnetism in LaCoO3 Thin Films Through Cation‐Stoichiometric Engineering

Antiferromagnetism and Weak Ferromagnetism of Disordered bcc V–Cr–Mn Ternary Alloys

Ferromagnetism and antiferromagnetism in disordered Ni-Mn alloys

Cation partitioning in ternary vanadium sulfides2S4 (A=Ti, Cr, Fe, Ni)

Crystal structure, thermal and magnetic properties of La3Co3O8. Phase relations for LaCoO3–δ (0.00≤δ≤0.50) at 673 K

The effect of the B-site cation and oxygen stoichiometry on the local and average crystal and magnetic structures of Sr2Fe1.9M0.1O5+y (M = Mn, Cr, Co; y = 0, 0.5)

Structural characterisation and spin glass behaviour of the new oxide Ba₂ScCoO₅

Absence of magnetic ordering in the ground state of a SrTm₂O₄ single crystal

Cation partitioning in ternary vanadium sulfides₂S₄ (A=Ti, Cr, Fe, Ni)

Crystal structure, thermal and magnetic properties of La₃Co₃O₈. Phase relations for LaCoO_3–δ (0.00≤δ≤0.50) at 673 K

The effect of the B-site cation and oxygen stoichiometry on the local and average crystal and magnetic structures of Sr₂Fe_1.9M_0.1O_5+y (M = Mn, Cr, Co; y = 0, 0.5)