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Title: Crystal structures, charge and oxygen-vacancy ordering in oxygen deficient perovskites SrMnO{sub x} (x < 2.7).

Abstract

Bulk SrMnOx samples with oxygen contents 2.5x<2.7 have been studied using a combination of neutron time-of-flight and high-energy high-resolution synchrotron X-ray diffraction measurements along with thermogravimetric analysis. We report the identification and characterization of two new oxygen-vacancy ordered phases, Sr5Mn5O13 (SrMnO2.6-tetragonal P4/m a=8.6127(3) Angstroms, c=3.8102(2)Angstroms) and Sr7Mn7O19 (SrMnO2.714-monoclinic P2/m a=8.6076(4)Angstroms, b=12.1284(4)Angstroms, c=3.8076(2)Angstroms, {gamma}=98.203(2) degrees). The nuclear and magnetic structures of Sr2Mn2O5 are also reported (SrMnO2.5 nuclear: orthorhombic Pbam, magnetic: Orthorhombic Ay type Pcbam with cM=2c). In the three phases, oxygen-vacancies are ordered in lines running along one of the (100) directions of the parent cubic perovskite system. Oxygen-vacancy ordering allows the charge and orbital ordering of the Mn3+ and Mn4+ cations in the new phases.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
914915
Report Number(s):
ANL/MSD/JA-58358
Journal ID: ISSN 0022-4596; JSSCBI; TRN: US0804844
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Solid State Chem.; Journal Volume: 180; Journal Issue: 5 ; May 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; CATIONS; CRYSTAL STRUCTURE; NEUTRONS; OXYGEN; PEROVSKITE; PEROVSKITES; SYNCHROTRONS; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION

Citation Formats

Suescun, L., Chmaissem, O., Mais, J., Dabrowski, B., Jorgensen, J. D., Materials Science Division, and Northern Illinois Univ. Crystal structures, charge and oxygen-vacancy ordering in oxygen deficient perovskites SrMnO{sub x} (x < 2.7).. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.03.020.
Suescun, L., Chmaissem, O., Mais, J., Dabrowski, B., Jorgensen, J. D., Materials Science Division, & Northern Illinois Univ. Crystal structures, charge and oxygen-vacancy ordering in oxygen deficient perovskites SrMnO{sub x} (x < 2.7).. United States. doi:10.1016/j.jssc.2007.03.020.
Suescun, L., Chmaissem, O., Mais, J., Dabrowski, B., Jorgensen, J. D., Materials Science Division, and Northern Illinois Univ. Tue . "Crystal structures, charge and oxygen-vacancy ordering in oxygen deficient perovskites SrMnO{sub x} (x < 2.7).". United States. doi:10.1016/j.jssc.2007.03.020.
@article{osti_914915,
title = {Crystal structures, charge and oxygen-vacancy ordering in oxygen deficient perovskites SrMnO{sub x} (x < 2.7).},
author = {Suescun, L. and Chmaissem, O. and Mais, J. and Dabrowski, B. and Jorgensen, J. D. and Materials Science Division and Northern Illinois Univ.},
abstractNote = {Bulk SrMnOx samples with oxygen contents 2.5x<2.7 have been studied using a combination of neutron time-of-flight and high-energy high-resolution synchrotron X-ray diffraction measurements along with thermogravimetric analysis. We report the identification and characterization of two new oxygen-vacancy ordered phases, Sr5Mn5O13 (SrMnO2.6-tetragonal P4/m a=8.6127(3) Angstroms, c=3.8102(2)Angstroms) and Sr7Mn7O19 (SrMnO2.714-monoclinic P2/m a=8.6076(4)Angstroms, b=12.1284(4)Angstroms, c=3.8076(2)Angstroms, {gamma}=98.203(2) degrees). The nuclear and magnetic structures of Sr2Mn2O5 are also reported (SrMnO2.5 nuclear: orthorhombic Pbam, magnetic: Orthorhombic Ay type Pcbam with cM=2c). In the three phases, oxygen-vacancies are ordered in lines running along one of the (100) directions of the parent cubic perovskite system. Oxygen-vacancy ordering allows the charge and orbital ordering of the Mn3+ and Mn4+ cations in the new phases.},
doi = {10.1016/j.jssc.2007.03.020},
journal = {J. Solid State Chem.},
number = 5 ; May 2007,
volume = 180,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}