Reference : Structures and Magnetism of the Rare-Earth Orthochromite Perovskite Solid Solution La...

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/19253

Title :	Structures and Magnetism of the Rare-Earth Orthochromite Perovskite Solid Solution LaxSm1−xCrO3
Language :	English
Author, co-author :	Daniels, Luke M. [University of Warwick, Coventry > Department of Chemistry and Department of Physics]
	Weber, Mads C. [CRP Gabriel Lippmann, Belvaux > Departement Sciences et Analyses des Materiaux > > ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Lees, Martin R. [University of Warwick, Coventry > Department of Physics]
	Guennou, Mael [CRP Gabriel Lippmann > Department Sciences et Analyse des Materiaux]
	Kashtiban, Reza J. [University of Warwick, Coventry > Department of Physics]
	Sloan, Jeremy [University of Warwick, Coventry > Department of Physics]
	Kreisel, Jens [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit > ; CRP Gabriel Lippmann, Belvaux > Departement Sciences et Analyse des Materiaux]
	Walton, Richard I. [University of Warwick, Coventry > Department of Chemistry]
Publication date :	8-Oct-2013
Journal title :	Inorganic Chemistry
Publisher :	American Chemical Society
Volume :	52
Pages :	121661-12169
Peer reviewed :	Yes (verified by ORBilu)
Audience :	International
ISSN :	0020-1669
e-ISSN :	1520-510X
City :	Washington
Country :	DC
Abstract :	[en] A new mixed rare-earth orthochromite series, LaxSm1−xCrO3, prepared through single-step hydrothermal synthesis is reported. Solid solutions (x = 0, 0.25, 0.5, 0.625, 0.75, 0.875, and 1.0) were prepared by the hydrothermal treatment of amorphous mixed-metal hydroxides at 370 °C for 48 h. Transmission electron microscopy (TEM) reveals the formation of highly crystalline particles with dendritic-like morphologies. Rietveld refinements against high-resolution powder X-ray diffraction (PXRD) data show that the distorted perovskite structures are described by the orthorhombic space group Pnma over the full composition range. Unit cell volumes and Cr−O−Cr bond angles decrease monotonically with increasing samarium content, consistent with the presence of the smaller lanthanide in the structure. Raman spectroscopy confirms the formation of solid solutions, the degree of their structural distortion. With the aid of shell-model calculations the complex mixing of Raman modes below 250 cm−1 is clarified. Magnetometry as a function of temperature reveals the onset of low-temperature antiferromagnetic ordering of Cr3+ spins with weak ferromagnetic component at Néel temperatures (TN) that scale linearly with unit cell volume and structural distortion. Coupling effects between Cr3+ and Sm3+ ions are examined with enhanced susceptibilities below TN due to polarization of Sm3+ moments. At low temperatures the Cr3+ sublattice is shown to undergo a second-order spin reorientation observed as a rapid decrease of susceptibility.
Permalink :	http://hdl.handle.net/10993/19253
DOI :	10.1021/ic402029u

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