skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Magnetic structure of Sr{sub 2}Fe{sub 2}O{sub 5} brownmillerite by single-crystal Mössbauer spectroscopy

Abstract

In order to determine orientation of the Fe{sup 3+} magnetic moments and electric field gradient (efg) axes in the brownmillerite-type strontium ferrite structure for both iron sublattices where the efg tensor is not axially symmetric, the Mössbauer spectra of powdered and oriented single-crystal Sr{sub 2}Fe{sub 2}O{sub 5} were analyzed by solving the complete Hamiltonian for hyperfine interactions in the excited and ground states of the {sup 57}Fe nuclei. The magnetic moments of both octahedrally and tetrahedrally coordinated iron cations lie on the ac-plane of the orthorhombic unit cell and are parallel to the shortest c-axis, whilst the main efg axes are parallel to the longest crystallographic axis, b. This orientation is similar to that in Ca{sub 2}Fe{sub 2}O{sub 5}, in spite of the structural differences of strontium and calcium ferrite brownmillerites at low temperatures. - Graphical abstract: Mössbauer spectra of powdered and oriented single-crystal Sr{sub 2}Fe{sub 2}O{sub 5}, analyzed by solving the complete Hamiltonian for hyperfine interactions in the excited and ground states of the {sup 57}Fe nuclei, show that the magnetic moments of both octahedrally and tetrahedrally coordinated iron cations are parallel to the shortest c-axis of the orthorhombic brownmillerite unit cell . Display Omitted - Highlights: • Single-crystalmore » Mössbauer spectroscopy is used to study magnetic structure of Sr{sub 2}Fe{sub 2}O{sub 5}. • Complete Hamiltonian for hyperfine interactions in excited and ground states was solved. • Fe{sup 3+} magnetic moments are parallel to the shortest crystallographic axis c. • The orientation of nuclear electric field gradient is similar to that in Ca{sub 2}Fe{sub 2}O{sub 5}.« less

Authors:
 [1];  [1]; ;  [2]
  1. UCQR, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, CFMC-UL, Estrada Nacional 10, 2686-953 Sacavém (Portugal)
  2. School of Chemistry, The University of Sydney, Sydney 2006 (Australia)
Publication Date:
OSTI Identifier:
22274063
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 205; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; CALCIUM; CATIONS; CRYSTALLOGRAPHY; ELECTRIC FIELDS; FERRITE; FERRITES; GROUND STATES; HAMILTONIANS; INTERACTIONS; IRON; IRON 57; IRON IONS; MAGNETIC MOMENTS; MONOCRYSTALS; ORIENTATION; ORTHORHOMBIC LATTICES; POWDERS; SPECTRA; SPECTROSCOPY; STRONTIUM

Citation Formats

Waerenborgh, J. C., Tsipis, E. V., Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Auckett, J. E., Ling, C. D., Kharton, V.V., E-mail: kharton@ua.pt, and Institute of Solid State Physics RAS, Chernogolovka 142432, Moscow Region. Magnetic structure of Sr{sub 2}Fe{sub 2}O{sub 5} brownmillerite by single-crystal Mössbauer spectroscopy. United States: N. p., 2013. Web. doi:10.1016/J.JSSC.2013.06.030.
Waerenborgh, J. C., Tsipis, E. V., Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Auckett, J. E., Ling, C. D., Kharton, V.V., E-mail: kharton@ua.pt, & Institute of Solid State Physics RAS, Chernogolovka 142432, Moscow Region. Magnetic structure of Sr{sub 2}Fe{sub 2}O{sub 5} brownmillerite by single-crystal Mössbauer spectroscopy. United States. https://doi.org/10.1016/J.JSSC.2013.06.030
Waerenborgh, J. C., Tsipis, E. V., Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Auckett, J. E., Ling, C. D., Kharton, V.V., E-mail: kharton@ua.pt, and Institute of Solid State Physics RAS, Chernogolovka 142432, Moscow Region. 2013. "Magnetic structure of Sr{sub 2}Fe{sub 2}O{sub 5} brownmillerite by single-crystal Mössbauer spectroscopy". United States. https://doi.org/10.1016/J.JSSC.2013.06.030.
@article{osti_22274063,
title = {Magnetic structure of Sr{sub 2}Fe{sub 2}O{sub 5} brownmillerite by single-crystal Mössbauer spectroscopy},
author = {Waerenborgh, J. C. and Tsipis, E. V. and Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193 Aveiro and Auckett, J. E. and Ling, C. D. and Kharton, V.V., E-mail: kharton@ua.pt and Institute of Solid State Physics RAS, Chernogolovka 142432, Moscow Region},
abstractNote = {In order to determine orientation of the Fe{sup 3+} magnetic moments and electric field gradient (efg) axes in the brownmillerite-type strontium ferrite structure for both iron sublattices where the efg tensor is not axially symmetric, the Mössbauer spectra of powdered and oriented single-crystal Sr{sub 2}Fe{sub 2}O{sub 5} were analyzed by solving the complete Hamiltonian for hyperfine interactions in the excited and ground states of the {sup 57}Fe nuclei. The magnetic moments of both octahedrally and tetrahedrally coordinated iron cations lie on the ac-plane of the orthorhombic unit cell and are parallel to the shortest c-axis, whilst the main efg axes are parallel to the longest crystallographic axis, b. This orientation is similar to that in Ca{sub 2}Fe{sub 2}O{sub 5}, in spite of the structural differences of strontium and calcium ferrite brownmillerites at low temperatures. - Graphical abstract: Mössbauer spectra of powdered and oriented single-crystal Sr{sub 2}Fe{sub 2}O{sub 5}, analyzed by solving the complete Hamiltonian for hyperfine interactions in the excited and ground states of the {sup 57}Fe nuclei, show that the magnetic moments of both octahedrally and tetrahedrally coordinated iron cations are parallel to the shortest c-axis of the orthorhombic brownmillerite unit cell . Display Omitted - Highlights: • Single-crystal Mössbauer spectroscopy is used to study magnetic structure of Sr{sub 2}Fe{sub 2}O{sub 5}. • Complete Hamiltonian for hyperfine interactions in excited and ground states was solved. • Fe{sup 3+} magnetic moments are parallel to the shortest crystallographic axis c. • The orientation of nuclear electric field gradient is similar to that in Ca{sub 2}Fe{sub 2}O{sub 5}.},
doi = {10.1016/J.JSSC.2013.06.030},
url = {https://www.osti.gov/biblio/22274063}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 205,
place = {United States},
year = {Sun Sep 15 00:00:00 EDT 2013},
month = {Sun Sep 15 00:00:00 EDT 2013}
}