首页> 外文期刊>RSC Advances >The investigation of structural and vibrational properties and optical behavior of Ti-doped La0.67Ba0.25Ca0.08Mn(1-x)TixO3 (x=0.00, 0.05 and 0.10) manganites
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The investigation of structural and vibrational properties and optical behavior of Ti-doped La0.67Ba0.25Ca0.08Mn(1-x)TixO3 (x=0.00, 0.05 and 0.10) manganites

机译:Ti-Doped La0.67ba0.25ca0.08mn(1-x)Tixo3(x = 0.00,0.05和0.10)锰的结构和振动性能和光学行为的研究

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The influence of Ti4+ ions incorporated into the B site on the structural, vibrational and optical properties of La0.67Ba0.25Ca0.08Mn(1-x)TixO3 (LBCM(1-x)Tx), a polycrystalline compound prepared by a molten salt method, was discussed. The X-ray diffraction (XRD) studies confirmed that at room temperature these compounds crystallize in the rhombohedral phases of R3c. Rietveld refinement indicated that the octahedron (Mn/Ti)O-6 underwent a slight deformation and the theta((Mn/Ti)-O-(Mn/Ti)) bond angles decreased with the increase in the Ti content. Furthermore, Raman spectra were recorded at room temperature for the LBCM(1-x)Tx ceramics to investigate the influence of incorporated Ti4+ ions in LBCM(1-x)Tx. Moreover, we controlled the frequency and damping of the optic modes based on Ti incorporation. The infrared (IR) absorption spectrum (FTIR) analysis in the span of 420-750 cm(-1) supports the XRD results. The diffuse reflectance data at room temperature verified that both transition levels (E-5(g) -> T-5(5g)) and ((4)A(2g) -> T-4(2g)) correspond to the Mn3+ and Mn4+ ions. The optical band gap (E-g) values decreased from 2.90 eV to 2.70 eV with the increase in the Ti4+ content, implying that our samples could be good candidates for some applications in luminescent devices, such as ultrafast optoelectronic devices. Moreover, the photoluminescence spectra (PL) features at room temperature decreased for all samples. CIE were estimated for all the concentrations of Ti4+ ions. The results indicated that are a shifts in the CIE values of the compounds.
机译:将Ti4 +离子掺入B位点的影响在La0.67ba0.25ca0.08mn(1-x)tixo3(Lbcm(1-x)tx)的结构,振动和光学性质上,由熔盐制备的多晶化合物方法,被讨论。 X射线衍射(XRD)研究证实,在室温下,这些化合物在R3C的菱形相中结晶。 RIETVELD改进表明,八面体(MN / TI)O-6进行了轻微变形,并且随着TI含量的增加,键((MN / TI)-O-(MN / TI))键角减小。此外,在室温下记录拉曼光谱,用于LBCM(1-X)TX陶瓷,以研究LBCM(1-x)Tx中的掺入Ti4 +离子的影响。此外,我们基于Ti Indond控制了光学模式的频率和阻尼。 420-750cm(-1)跨度的红外(IR)吸收光谱(FTIR)分析支持XRD结果。室温下的漫反射数据验证过渡水平(E-5(g) - > T-5(5g))和((4)(2g) - > t-4(2g))对应于MN3 +和mn4 +离子。光学带隙(E-G)值随着Ti4 +含量的增加,从2.90eV降低至2.70eV,这意味着我们的样品可以是发光器件中的一些应用的良好候选,例如超快光电器件。此外,对于所有样品,室温下的光致发光光谱(PL)特征降低。 CIE估计所有浓度的Ti4 +离子。结果表明,化合物的CIE值中是偏移。

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    《RSC Advances》 |2019年第72期|共10页
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  • 中图分类 化学;
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