Structure, microstructure and magnetic properties of Sr{sub 1-x}Ca{sub x}CrO{sub 3} (0{<=}x{<=}1)
- Departamento de Quimica Inorganica, Laboratorio Complutense de Altas Presiones, Facultad de Quimica, Universidad Complutense de Madrid, EU, 28040 Madrid (Spain)
The effect of the calcium concentration on the structural, microstructural and magnetic properties of Sr{sub (1-x)}Ca{sub x}CrO{sub 3} with 0{<=}x{<=}1 has been studied. The compounds were prepared using high pressure and high temperature synthesis. X-ray diffraction shows that the samples evolve from the cubic Pm-3m space group for x=0-0.2 to tetragonal I4/mcm for x=0.4-0.5, then to the orthorhombic Pbnm space group for x=0.6, 0.8 and 1.0. Electron diffraction and high-resolution transmission electron microscopy confirmed the respective cells for the end compositions: a{sub p}xa{sub p}xa{sub p} (Pm-3m) for SrCrO{sub 3}; and the {radical}(2)a{sub p}x{radical}(2)a{sub p}x2a{sub p} (Pbnm) for CaCrO{sub 3}. For intermediate compositions some extra spots appear in the electron diffraction patterns while the electron micrographs indicate the presence of microdomains. Magnetic measurements show Curie-Weiss behaviour at high temperature for all the samples. A sharp antiferromagnetic (AFM) transition at about 91.5 K appears for x=0.8-1 together with a weak ferromagnetic ordering below T{sub N}. - Graphical abstract: HRTEM image of a crystal of Sr{sub 0.5}Ca{sub 0.5}CrO{sub 3} showing a random distribution of 2a{sub p}{approx}7.6 A all along the crystal that lacks long range order. Inset shows the FFT of the area of the image and of a tenth of that area showing the influence of the coherence length.
- OSTI ID:
- 21128262
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 4; Other Information: DOI: 10.1016/j.jssc.2008.01.022; PII: S0022-4596(08)00034-0; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
ATOMIC FORCE MICROSCOPY
CALCIUM COMPOUNDS
CHROMATES
ELECTRON DIFFRACTION
MAGNETIC PROPERTIES
MICROSTRUCTURE
ORTHORHOMBIC LATTICES
PEROVSKITE
SOLID SOLUTIONS
STRONTIUM COMPOUNDS
SYNTHESIS
TEMPERATURE RANGE 0065-0273 K
TETRAGONAL LATTICES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION