ملخص
A structural and Mössbauer study of mechanosynthesized EuCr 1-xFe xO 3 nanocrystalline particles (~20-30 nm) is presented. The lattice parameters increase with increasing x-value leading to an increasingly distorted structure. The crystallite sizes range between 20 nm and 30 nm. Magnetic and 57Fe Mössbauer measurements show the samples with x < 0. 7 to be paramagnetic and those with x ≥ 0. 7 to be partially superparamagnetic at 298 K. The 78 K Mössbauer spectra of the samples with x = 0. 3-1. 0 are composed of well-resolved two sextets that are explicable in terms of the structural model that we recently have proposed for the EuCrO 3 nanoparticles according to which the transition metal ions and Eu 3+ partly exchange their usual sites in the perovskite-related structure (Widatallah et al. J Phys D Appl Phys 44:265403, 2011). Consequently, the two sextets obtained at 78 K refer to Fe 3+ ions at the usual B-octahedral site and the A-dodecahedral site usually occupied by Eu 3+.
اللغة الأصلية | English |
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الصفحات (من إلى) | 101-104 |
عدد الصفحات | 4 |
دورية | Hyperfine Interactions |
مستوى الصوت | 205 |
رقم الإصدار | 1-3 |
المعرِّفات الرقمية للأشياء | |
حالة النشر | Published - مارس 2012 |
ASJC Scopus subject areas
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