TY - GEN
T1 - Mössbauer study of (Ca,Sr)RuO 3 doped with 57Fe
AU - Nomura, Kiyoshi
AU - Zboril, Radek
AU - Mashlan, Miroslav
AU - Rykov, Alexander
AU - Felner, Israel
PY - 2005/4/26
Y1 - 2005/4/26
N2 - 2% of 57Fe doped in Ca 1-xSr xRuO 3 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 Mössbauer 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 Mössbauer spectra through the change of: (a) the quadrupole splitting parameter, (∼ 0.1 mm/s for x=0 and ∼0 or slightly negative for x ≥ 0.4 samples). (b) The isomer shift (c) the magnetic hyperfine parameters (H eff), and (d) the magnetic transition temperature, which increase with x. The temperature dependence of H eff is significantly different for the CaRu 0.9857Fe 0.02O 3 as compared to samples with x = 0.6, 0.8 and 1. In the latter materials, Mössbauer spectra at low temperatures show a much wider distribution in H eff 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 Ca 1-xSr xRuO 3 with x < 0.2 and a ferromagnetic behavior for the rich Sr samples.
AB - 2% of 57Fe doped in Ca 1-xSr xRuO 3 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 Mössbauer 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 Mössbauer spectra through the change of: (a) the quadrupole splitting parameter, (∼ 0.1 mm/s for x=0 and ∼0 or slightly negative for x ≥ 0.4 samples). (b) The isomer shift (c) the magnetic hyperfine parameters (H eff), and (d) the magnetic transition temperature, which increase with x. The temperature dependence of H eff is significantly different for the CaRu 0.9857Fe 0.02O 3 as compared to samples with x = 0.6, 0.8 and 1. In the latter materials, Mössbauer spectra at low temperatures show a much wider distribution in H eff 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 Ca 1-xSr xRuO 3 with x < 0.2 and a ferromagnetic behavior for the rich Sr samples.
UR - http://www.scopus.com/inward/record.url?scp=33749262504&partnerID=8YFLogxK
U2 - 10.1063/1.1923661
DO - 10.1063/1.1923661
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AN - SCOPUS:33749262504
SN - 0735402507
SN - 9780735402508
T3 - AIP Conference Proceedings
SP - 233
EP - 238
BT - INDUSTRIAL APPLICATIONS OF THE MOSSBAUER EFFECT
T2 - International Conference on the Industrial Applications of the Mossbauer Effect
Y2 - 4 October 2004 through 8 October 2004
ER -