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钛掺杂的LaBaCaMnTiO（x = 0.00、0.05和0.10）锰氧化物的结构、振动特性及光学行为研究

The investigation of structural and vibrational properties and optical behavior of Ti-doped LaBaCaMnTi O ( = 0.00, 0.05 and 0.10) manganites.

作者信息

Bourguiba Marwa, Raddaoui Zeineb, Chafra Moez, Dhahri Jemai

机构信息

Laboratoire de Recherche en Mécanique Appliquée et Systèmes, Ecole Polytechnique de Tunisie, Université de Carthage La Marsa Tunisia.

Faculté des Sciences de Tunis, Université de Tunis El Manar Tunis 2092 Tunisia.

出版信息

RSC Adv. 2019 Dec 19;9(72):42252-42261. doi: 10.1039/c9ra07407d. eCollection 2019 Dec 18.

DOI:10.1039/c9ra07407d
PMID:35542875
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9076526/
Abstract

The influence of Ti ions incorporated into the B site on the structural, vibrational and optical properties of LaBaCaMnTi O (LBCMT ), 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 3̄. Rietveld refinement indicated that the octahedron (Mn/Ti)O underwent a slight deformation and the bond angles decreased with the increase in the Ti content. Furthermore, Raman spectra were recorded at room temperature for the LBCMT ceramics to investigate the influence of incorporated Ti ions in LBCMT . 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 supports the XRD results. The diffuse reflectance data at room temperature verified that both transition levels (E → T) and (A → T) correspond to the Mn and Mn ions. The optical band gap ( ) values decreased from 2.90 eV to 2.70 eV with the increase in the Ti 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 Ti ions. The results indicated that are a shifts in the CIE values of the compounds.

摘要

讨论了掺入B位的Ti离子对通过熔盐法制备的多晶化合物LaBaCaMnTi O（LBCMT ）的结构、振动和光学性质的影响。X射线衍射（XRD）研究证实，在室温下这些化合物结晶为3̄的菱面体相。Rietveld精修表明八面体（Mn/Ti）O发生了轻微变形，并且键角随着Ti含量的增加而减小。此外，在室温下记录了LBCMT 陶瓷的拉曼光谱，以研究掺入LBCMT 中的Ti离子的影响。此外，我们基于Ti的掺入控制了光学模式的频率和阻尼。420 - 750 cm范围内的红外（IR）吸收光谱（FTIR）分析支持XRD结果。室温下的漫反射数据证实，跃迁能级（E → T）和（A → T）均对应于Mn和Mn离子。随着Ti含量的增加，光学带隙（ ）值从2.90 eV降至2.70 eV，这意味着我们的样品可能是发光器件（如超快光电器件）某些应用的良好候选材料。此外，所有样品在室温下的光致发光光谱（PL）特征均降低。对所有Ti离子浓度估计了CIE。结果表明化合物的CIE值存在偏移。

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