Reinvestigation of the Fe-rich part of the pseudo-binary system SrO-Fe{sub 2}O{sub 3}

Journal Article · Tue Sep 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.05.039· OSTI ID:21370571

Langhof, N ^[1]; Seifert, D ^[2]; Goebbels, M ^[1]; Toepfer, J ^[2]

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1. Friedrich-Alexander-University Erlangen-Nuremberg, GeoZentrum Nordbayern, Mineralogy, Schlossgarten 5a, 91054 Erlangen (Germany)
2. University of Applied Sciences Jena, Department of Science and Technology, Carl-Zeiss-Promenade 2, 07745 Jena (Germany)

The phase relations in the Fe-rich part of the pseudo-binary system SrO-Fe{sub 2}O{sub 3} (>33 mol% Fe{sub 2}O{sub 3}) were reinvestigated between 800 and 1500 deg. C in air. A combination of microscopy, electron probe micro-analysis, powder X-ray diffraction and thermal analysis was used to determine phase relations, crystal structure parameters and phase transition temperatures. M-type hexagonal ferrite SrFe{sub 12}O{sub 19} (85.71 mol% Fe{sub 2}O{sub 3}) is stable up to 1410 deg. C. No indication of a significant phase width was found; Sr{sub 4}Fe{sub 6}O{sub 13+}-{sub {delta}} appears as a second phase in compositions with <85.71+-0.2 mol% Fe{sub 2}O{sub 3}. Sr{sub 4}Fe{sub 6}O{sub 13+}-{sub {delta}} itself is stable between 800 and 1250 deg. C. Two other hexagonal ferrites were found to exist at high temperatures only: W-type SrFe{sup 2+}{sub 2}Fe{sup 3+}{sub 16}O{sub 27} is stable between 1350 and 1440 deg. C and X-type ferrite Sr{sub 2}Fe{sup 2+}{sub 2}Fe{sup 3+}{sub 28}O{sub 46} between 1350 and 1420 deg. C, respectively, which is shown here for the first time. These findings in combination with previously published data were used to derive a corrected phase diagram of the Fe-rich part of the pseudo-binary system SrO-Fe{sub 2}O{sub 3}. - Abstract: Part of the SrO-Fe{sub 2}O{sub 3} phase diagram in air

• OSTI ID: 21370571
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 9; Other Information: DOI: 10.1016/j.jssc.2009.05.039; PII: S0022-4596(09)00238-2; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CRYSTAL STRUCTURE
ELECTRON MICROPROBE ANALYSIS
FERRITES
IRON OXIDES
MAGNETS
MICROSCOPY
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
STRONTIUM OXIDES
TEMPERATURE RANGE 1000-4000 K
THERMAL ANALYSIS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIAGRAMS
DIFFRACTION
EQUIPMENT
FERRIMAGNETIC MATERIALS
INFORMATION
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
MICROANALYSIS
NONDESTRUCTIVE ANALYSIS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS