Moessbauer Study of (Ca,Sr)RuO3 Doped with 57Fe

Journal Article · Tue Apr 26 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1923661· OSTI ID:20722140

Nomura, Kiyoshi; Rykov, Alexander ^[1]; Zboril, Radek; Mashlan, Miroslav ^[2]; Felner, Israel ^[3]

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1. Department of Applied Chemistry, School of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku Tokyo 113-8656 (Japan)
2. Department of Physical Chemistry, Palacky University, Svobody 26, 771 46 Olomouc (Czech Republic)
3. Racah Institute of Physics, The Hebrew University of Jerusalem, 91904 Israel (Israel)

2% of 57Fe doped in Ca1-xSrxRuO3 materials ( x ranging from 0 to 1) were prepared by a sol-gel method. The influence of the Sr/Ca ratio on the structural and magnetic properties of ruthenates was investigated by XRD and Moessbauer spectroscopy (15 - 300 K). The refined lattice parameters indicate an expansion of the unit cell volume with Sr and a transition of the crystal symmetry from orthorhombic for x < 0.4 to tetragonal for higher Sr content. This transition is also manifested in the 57Fe Moessbauer spectra through the change of: (a) the quadrupole splitting parameter ({approx} 0.1 mm/s for x=0 and {approx}0 or slightly negative for x {>=} 0.4 samples). (b) The isomer shift (c) the magnetic hyperfine parameters (Heff), and (d) the magnetic transition temperature, which increase with x. The temperature dependence of Heff is significantly different for the CaRu{sub 0.98}{sup 57}Fe{sub 0.02}O{sub 3} as compared to samples with x = 0.6, 0.8 and 1. In the latter materials, Moessbauer spectra at low temperatures show a much wider distribution in Heff In particular, the field maximum probability decreases progressively with T, whereas for the x=0 material, it remains almost constant. Such behavior is closely related with the literature data on a spin glass ordering of Ca1-xSrxRuO3 with x < 0.2 and a ferromagnetic behavior for the rich Sr samples.

• OSTI ID: 20722140
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 765; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM COMPOUNDS
DOPED MATERIALS
FERROMAGNETIC MATERIALS
IRON 57
ISOMER SHIFT
LATTICE PARAMETERS
MAGNETIC PROPERTIES
MOESSBAUER EFFECT
OXYGEN COMPOUNDS
QUADRUPOLES
RUTHENIUM COMPOUNDS
SOL-GEL PROCESS
SPIN GLASS STATE
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION TEMPERATURE
X-RAY DIFFRACTION