Dielectric resonance and magnetic properties of Fe-3% doped BaSnO3 thin films grown by pulsed laser deposition

Journal of Applied Physics (Impact Factor: 2.18). 04/2012; DOI: 10.1063/1.3698301


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. []

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    ABSTRACT: Polycrystalline bulk samples of BaSn1-xMnxO3 with x = 0, 0.05, 0.10 and 0.13 are prepared by the conventional solid state reaction method. The effects of Mn concentration on crystal structural, optical and magnetic properties of BaSn1-xMnxO3 are investigated systematically. Powder X-ray diffraction (XRD) shows that each of these compounds presens a perovskite structure (with the space group Pm3̄m) without the secondary crystalline phase. The Mn ions take the Sn sites which is revealed by the XRD, diffusion reflectance spectrum (DRS) and Raman scattering. With the increase of doping level x, the optical absorption edge shifts towards higher wavelength and is smoothened gradually, meanwhile the Raman spectrum shows that Raman mode is also changed. The photolu-minescence spectrum under magnetic field shows that near-infrared luminescence is probably related to Sn ions. The magnetization measurement demonstrates that Mn-doped BaSnO3 system exhibits ferromagnetism at low temperature, which can be explained by the F-center exchange (FCE) mechanism.
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    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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