Structural characterization of the perovskite series Sr{sub 1−x}La{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}

Journal Article · Mon Apr 15 00:00:00 EDT 2013 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2013.01.011· OSTI ID:22304529

Qasim, Ilyas ^[1]

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1. School of Chemistry, The University of Sydney, Sydney, NSW 2006 (Australia)

The perovskite-type compounds Sr{sub 1−x}La{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}, x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 have been synthesized by solid-state methods, and their room temperature structures determined using X-ray synchrotron powder diffraction. The x=0.0 end member, SrMn{sub 0.5}Ti{sub 0.5}O{sub 3} is cubic in space group Pm3{sup ¯}m; there being no evidence for ordering of the Ti{sup 4+} and Mn{sup 4+} cations. We find that x=0.5 compound is rhombohedral in R3{sup ¯}c rather than orthorhombic as reported previously. Magnetic measurements suggest that both SrMn{sub 0.5}Ti{sub 0.5}O{sub 3} and Sr{sub 0.5}La{sub 0.5}Mn{sub 0.5}Ti{sub 0.5}O{sub 3} are spin-glasses. - Graphical abstract: A cubic–rhombohedral phase-transition is observed cation disordered perovskites Sr{sub 1−x}La{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}. Both end members are spin-glasses. Highlights: ► Structural studies of Sr{sub 1−x}La{sub x}Ti{sub 0.5}Nb{sub 0.5}O{sub 3} perovskites, show lack of long range Mn:Ti order. ► Magnetic properties indicative of spin-glass behavior. ► Changes of crystal structure from cubic to rhombohedral with increasing lanthanum content.

• OSTI ID: 22304529
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 200; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CATIONS
CUBIC LATTICES
LANTHANUM
MAGNETIC PROPERTIES
MANGANESE IONS
ORTHORHOMBIC LATTICES
PEROVSKITE
PHASE TRANSFORMATIONS
SOLIDS
SPACE GROUPS
SPIN GLASS STATE
TITANIUM IONS
TRIGONAL LATTICES
X-RAY DIFFRACTION