Mössbauer study of (Ca,Sr)RuO 3 doped with 57Fe

Kiyoshi Nomura*, Radek Zboril, Miroslav Mashlan, Alexander Rykov, Israel Felner

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

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.

Original languageEnglish
Title of host publicationINDUSTRIAL APPLICATIONS OF THE MOSSBAUER EFFECT
Subtitle of host publicationInternational Symposium on the Industrial Applications of the Mossbauer Effect
Pages233-238
Number of pages6
DOIs
StatePublished - 26 Apr 2005
EventInternational Conference on the Industrial Applications of the Mossbauer Effect - Madrid, Spain
Duration: 4 Oct 20048 Oct 2004

Publication series

NameAIP Conference Proceedings
Volume765
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference on the Industrial Applications of the Mossbauer Effect
Country/TerritorySpain
CityMadrid
Period4/10/048/10/04

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