Eu3+包裹体结构紊乱导致GdVO4纳米体系中部分锆石向白钨矿型相变的拉曼特征

IF 2.7 3区化学 Q2 CHEMISTRY, ANALYTICAL

Vibrational Spectroscopy Pub Date : 2025-04-04 DOI:10.1016/j.vibspec.2025.103802

Aftab Ansari , D. Mohanta

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引用次数: 0

摘要

本文报道了在允许的取代掺杂情况下，在含有Eu3+的GdVO4纳米体系中遇到的锆-白钨矿部分相转化的拉曼分析。具体来说，在特征的拉曼模式中，A1g模式属于O-V-O振动，B2 g代表由Eu-O拉伸引起的平移振动模式（~ 258 cm−1）。强烈的高频模式ν2 = 880 cm-1可以描述具有四方对称的理想锆石型构象的四面体[VO4]3-阴离子基的拉伸内部振动。重要的是，在GdVO4纳米体系的室温拉曼研究中，A1g（剪切）和B2g（扭曲）两种拉曼活性模式的重叠表征了所研究纳米体系的白钨矿型特征。在体系中加入Eu3+，由于在基体中Eu3+位点附近可能发生局部相变，导致白钨矿型特征的强度增强。本文着重分析了Eu3+掺杂（1-7 %）导致的白钨矿型信号增强和部分锆石晶格向白钨矿晶格转变，并对其表现模式进行了详细分析。

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Raman signature of partial zircon to scheelite-type phase conversion in GdVO4 nanosystem due to structural disordering induced by Eu3+ inclusions

This work reports Raman analysis of zircon-to-scheelite partial phase conversion encountered in GdVO₄ nanosystem with Eu³⁺ around permissible substitutional doping. To be specific, among the Raman modes featured, the A_1g mode is attributed to O-V-O vibration while B_2 g represents the translatory vibrational mode (∼258 cm⁻¹) attributed to the Eu–O stretching. The intense high-frequency mode, ν₂ = 880 cm^–1 would describe stretching internal vibration in the tetrahedral [VO₄]^3- anionic group for an ideal zircon-type conformation with tetragonal symmetry. Importantly, at room temperature Raman studies of GdVO₄ nanosystem, the overlap of two Raman active modes namely, A_1g (scissoring) and B_2g (twisting) characterize scheelite-type characteristics in the nanosystem under study. Incorporation of Eu³⁺ in the system resulted in enhancing the intensity of the scheelite-type characteristics due to possible localized phase transition around Eu³⁺ sites in the matrix. The observed scheelite-type signal enhancement and consequently partial zircon lattice to scheelite lattice conversion due to inclusion of Eu³⁺ doping (1–7 %) has been highlighted and analyzed emphasizing manifested modes in detail.

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来源期刊

Vibrational Spectroscopy 化学-分析化学

CiteScore

4.70

自引率

4.00%

发文量

103

审稿时长

52 days

期刊介绍： Vibrational Spectroscopy provides a vehicle for the publication of original research that focuses on vibrational spectroscopy. This covers infrared, near-infrared and Raman spectroscopies and publishes papers dealing with developments in applications, theory, techniques and instrumentation. The topics covered by the journal include: Sampling techniques, Vibrational spectroscopy coupled with separation techniques, Instrumentation (Fourier transform, conventional and laser based), Data manipulation, Spectra-structure correlation and group frequencies. The application areas covered include: Analytical chemistry, Bio-organic and bio-inorganic chemistry, Organic chemistry, Inorganic chemistry, Catalysis, Environmental science, Industrial chemistry, Materials science, Physical chemistry, Polymer science, Process control, Specialized problem solving.