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Author(s) |
Patel, D. K.; Rajeswari, B.; Sudarsan, V.; Vatsa, R. K.; Kadam, R. M.; Kulshreshtha, S. K. (ChD;RCD;KMG)
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Source |
Dalton Transactions, 2012. Vol. 41 (39): pp. 12023-12030 |
ABSTRACT
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The present study describes the structural and luminescent properties of SrSnO3 nanorods containing Eu3+ ions. Based on Rietveld refinement of XRD patterns corresponding to both undoped and europium doped SrSnO3 nanorods, it is inferred that the average bond lengths of Sr–O1 linkages, which have a square planar geometry around Sr2+ in the SrO12 polyhedra present in SrSnO3, remained unaffected with Eu3+ incorporation into the lattice. However, the average bond lengths of shorter Sr–O2 linkages increase and longer Sr–O2 linkages decrease with Eu3+ doping into the SrSnO3 lattice. A lack of variation in the lattice parameters of SrSnO3 with doped Eu3+ ions is explained based on mutually compensating changes in the average bond lengths of the Sr–O2 linkages in the unit cell. Luminescence studies have confirmed that Eu3+ ions occupy the centrosymmetric Sr2+ site only up to 2 at%, beyond which Eu3+ ions exist in a significantly distorted environment (grain boundaries). Beyond 3%, incorporation of Eu3+ ions into the SrSnO3 lattice leads to the formation of a Eu2Sn2O7 phase. From the EPR studies it is confirmed that around 5% of the incorporated Eu3+ ions get converted to Eu2+ ions and they occupy Sr2+ sites in the lattice.. |
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