Structural and electronic phase transitions in Sr{sub 1-x}Ce{sub x}MnO{sub 3} perovskites

Journal Article · Wed Oct 15 04:00:00 EDT 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.06.022· OSTI ID:21212043

Saines, Paul J; Qingdi, Zhou ^[1]; Zhaoming, Zhang ^[2]; Matsuda, Motohide; Miyake, Michihiro ^[3]

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1. School of Chemistry, University of Sydney, Sydney, NSW 2006 (Australia)
2. Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234 (Australia)
3. Graduate School of Environmental Science, Okayama University, 3-1-1 Tsushima-Naka, Okayama 700-8530 (Japan)

The structures of eight members of the series Sr{sub 1-x}Ce{sub x}MnO{sub 3} with 0.075{<=}x{<=}0.4 have been established using synchrotron X-ray powder diffraction. These exhibit the sequence of structures (cubic)/(Pm3-barm) {yields}{sup x{approx}}{sup 0.08}(tetragonal)/(I4/mcm) {yields}{sup x{approx}}{sup 0.35}(orthorhombic)/(Imma) with increasing Ce content. Unusual peak broadening due to domain wall scattering is observed near the composition-induced first-order cubic-tetragonal transition. The temperature dependence of the structures for three examples x=0.1, 0.2 and 0.35 is described. For the x=0.1 and 0.35 samples evidence for a first-order loss of the orbital ordering associated with a cooperative Jahn-Teller distortion is presented. The onset of the orbitally disordered state is accompanied by a discontinuous reduction in cell volume. - Graphical abstract: The presence of small amounts of trivalent Mn in the series Sr{sub 1-x}Ce{sub x}MnO{sub 3} has a dramatic effect on the structure, with the structure changing from cubic to tetragonal and finally orthorhombic. The orbital ordering present at room temperature is lost upon heating.

• OSTI ID: 21212043
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CERIUM COMPOUNDS
CUBIC LATTICES
HEATING
ION MICROPROBE ANALYSIS
JAHN-TELLER EFFECT
MANGANESE OXIDES
ORTHORHOMBIC LATTICES
PEROVSKITE
PHASE TRANSFORMATIONS
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
X-RAY DIFFRACTION