Fe-3% doped BaSnO3 thin films of good crystalline quality with lattice constant a 4.053 A were grown on (2 0 0) n-type Si substrates by pulsed laser deposition. Micro Raman spectra of the thin films showed the presence of strain-induced Raman modes with reference to that of the bulk polycrystalline Fe-3% doped BaSnO3. The films exhibited dielectric resonance in the frequency range 20 - 60 MHz and it is explained qualitatively based on the phenomenon of electromechanical piezoelectric resonance. The measured values of the resonant frequency and the surface resistivity showed a strong dependence on the thickness and the crystalline-character of the thin films. Magnetic measurements were performed selectively for the two films having (2 0 0) preferred orientation. It was found that both of them possess ferromagnetic ordering at 300 K and 1.8 K. At 300 K, the inherent diamagnetism of the undoped BaSnO3 was found to be dominating for higher applied magnetic field. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698301]
[Show abstract][Hide abstract] ABSTRACT: Highly soluble and chemically unstable bimetallic complex Ba2Sn2(thd)(4)((OPr)-Pr-i)(8) (2) can be obtained with quantitative yield by interaction of Sn((OPr)-Pr-i)(4) (obtained by desolvation of the commercially available Sn((OPr)-Pr-i)(4)((PrOH)-Pr-i)) with 1 eq. of Ba(thd)(2) produced in situ in toluene. Microhydrolysis or solvolysis of this complex by parent alcohol results in its transformation into a mixture of easier isolable bimetallic solvates, Ba2Sn(thd)(4)((OPr)-Pr-i)(4)((PrOH)-Pr-i)(2) (3) and BaSn2(thd)(2)((OPr)-Pr-i)(8)((PrOH)-Pr-i)(2) (1) that have been isolated and structurally characterized. All three complexes reveal considerable volatility according to TGA data, making the studied beta-diketonate alkoxide system interesting for further evaluation for production of BaSnO3 thin films by MOCVD technique. Thermal decomposition of 1 and 3 provides mixtures of oxides dominated by BaSnO3, while that of 2 offers pure perovskite BaSnO3 phase.
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