Sol–Gel Synthesis and Multifunctional Characterization of Mo-Substituted YIG for High-Sensitivity Photodetection

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-06 DOI:10.1016/j.jallcom.2025.184235

Nguyen Phuc Duong, Dao Thi Thuy Nguyet, Nguyen Minh Vuong, To Thanh Loan, Nguyen Thi Nguyen

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引用次数: 0

Abstract

We investigated the influence of molybdenum (Mo) doping on the structural, magnetic, electrical, and optoelectronic properties of yttrium iron garnet (YIG) synthesized via the sol–gel method. X–ray diffraction (XRD) with Rietveld refinement confirmed a single-phase garnet structure (x = 0–0.1), showing slight lattice expansion and crystallite growth due to oxygen vacancies and Fe²⁺ formation as charge-compensation mechanisms. Scanning electron microscopy reveals a morphology shift from dendritic networks (x = 0) to porous agglomerates (x ≥ 0.06). We observed a blue shift (~2–3 cm⁻¹) of Fe–O vibrational modes and mode splitting in the Raman spectra at high Mo levels, indicating local lattice distortion. ICP-OES verifies Mo incorporation close to nominal values. Magnetic measurements at 5 K reveal long-range ferrimagnetism, but saturation magnetization and Curie temperature (T_C ~545 K for undoped YIG) decrease with increasing Mo, consistent with Fe³⁺ → Mo⁵⁺ substitution and charge compensation. T_C aligns with models where Mo occupies mainly octahedral sites at low doping and both octahedral/tetrahedral sites at higher levels. Mo doping lowers room-temperature resistivity from ~10¹⁰ Ω to <8 × 10⁴ Ω (x = 0.1), showing n-type behavior with ~0.19 eV activation energy. Under 914 nm illumination, Mo-doped YIG exhibits a strong bolometric response (I_ph ~270 µA, responsivity ~2.16 × 10³ mAW^-1, D* ~10⁹cm·Hz¹ᐟ²·W^-1), surpassing many oxide-based bolometric materials, highlighting its potential for advanced bolometers and spintronic devices.

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高灵敏度光检测用mo取代YIG的溶胶-凝胶合成及多功能表征

研究了掺杂钼对溶胶-凝胶法制备钇铁石榴石（YIG）的结构、磁性、电学和光电性能的影响。Rietveld细化的x射线衍射（XRD）证实了一种单相石榴石结构（x = 0-0.1），由于氧空位和Fe 2 +的形成作为电荷补偿机制，显示出轻微的晶格膨胀和晶体生长。扫描电镜显示从树突网络（x = 0）到多孔团聚体（x≥0.06）的形态转变。我们观察到Fe-O振动模式的蓝移（~ 2-3 cm⁻¹）和模式分裂在高Mo能级的拉曼光谱中，表明了局部晶格畸变。ICP-OES验证Mo结合接近标称值。5 K下的磁测量显示出长程铁磁性，但饱和磁化强度和居里温度（未掺杂YIG为TC ~545 K）随着Mo的增加而降低，这与Fe³+→Mo 5 +的替代和电荷补偿一致。TC符合Mo在低掺杂水平下主要占据八面体位点，在高掺杂水平下同时占据八面体/四面体位点的模型。Mo掺杂使室温电阻率从~1010 Ω降至<；8 × 104 Ω （x = 0.1），表现为n型行为，活化能为~0.19 eV。在914 nm光照下，掺钼YIG表现出较强的辐射响应（Iph ~270µa，响应度~2.16 × 103 mAW-1, D* ~109 cm·Hz¹²·W-1），超过了许多基于氧化物的辐射材料，突出了其在先进辐射计和自旋电子器件方面的潜力。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.