Uniform structural phase transition in 
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 without short-range distortions of the local structure

Fletcher, Ethan; Higashi, Kentaro; Kalcheim, Yoav; Kageyama, Hiroshi; Frandsen, Benjamin A.

doi:10.1103/physrevb.104.184115

Cited by 4 publications

(2 citation statements)

References 63 publications

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“…Vanadium oxides such as VO, V 2 O 3 , V 3 O 5 , and VO 2 have long held the attention of researchers for their MIT behavior. ,− The transition temperature of VO 2 is approximately T MIT ≈ 340 K, providing an accessible way to manipulate the material properties near room temperature . At this temperature, the crystal structure of VO 2 changes from a low-temperature, insulating, monoclinic phase (M1; space group P 2 1 / c ) to a high-temperature, metallic, rutile phase (R; space group P 4 2 / mnm ).…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis and Single-Switch Antenna Application of Germanium-Doped Vanadium Dioxide

Prado-Rivera

Lai

Mohammed

et al. 2023

ACS Appl. Electron. Mater.

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Materials that undergo a phase transition from metallic to insulating, or metal−insulator transition (MIT), materials have become widely popular for their potential in emerging technologies due to their drastic conductivity change upon transitioning. Notable among the MIT materials is vanadium dioxide (VO 2 ), and ongoing efforts are focused on tuning its MIT phase transition temperature (TMIT). In this report, VO 2 germanium-doped nanoparticles with various germanium dopant levels were synthesized via a hydrothermal route and used in a simple single-switch antenna. Powder X-ray diffraction (XRD) analysis shows a monoclinic phase (M1) for both the pure and Gedoped VO 2 nanomaterials at room temperature, with no change in the diffraction pattern in the Ge-doped samples at low doping percentages; the M1 phase for both pure and Ge-doped VO 2 was further confirmed by Raman spectroscopy. Energy-dispersive X-ray spectroscopy (EDS) showed Ge uniformly distributed in the nanomaterials. The nanoparticles' morphology, imaged by fieldemission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), reveals a morphology change from nanoparticles to nanosheets with increased dopant concentration. Ge-doped VO 2 nanoparticle dispersions were used to print a single switch in an antenna solely obtained through a facile printing process. A vector network analyzer used to characterize the antenna performance showed that the germanium doping successfully changed the transition temperature of the material, demonstrating the capability of controlling the antenna operation frequencies as a function of material doping. Density functional theory (DFT) shows that substituting Ge into a V site of the crystal structure distorts the lattice and reduces the band gap at high doping percentages. These results provide insight into the potential of smart switches fabricated from Ge-doped VO 2 .

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis and Single-Switch Antenna Application of Germanium-Doped Vanadium Dioxide

Prado-Rivera

Lai

Mohammed

et al. 2023

ACS Appl. Electron. Mater.

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“…The rapid forward movement of the Internet has enabled the financial decision-making process of enterprises to have technological innovations to a certain extent [2]. In the era of big data and cloud accounting, it is more important for staff in all industries to focus on the current information technology, to learn and enrich their professional knowledge continuously, to apply big data and cloud accounting in financial work, and to provide more accurate and useful financial information to those who need them to use [3][4]. The background of big data and the widespread use of cloud accounting, which is the inevitable trend of the times, is an unparalleled opportunity for contemporary enterprises.…”

Section: Introductionmentioning

confidence: 99%

Application of cloud accounting in enterprise financial forecasting and decision making in the era of big data

2023

Applied Mathematics and Nonlinear Sciences

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In order to accurately understand the economic development of enterprises and increase the company’s economic benefits, a study on financial forecasting and decision-making in big data cloud accounting enterprises is proposed. Enterprises improve the efficiency of data utilization by acquiring information processing and analysis, establishing a diversified control mechanism, and improving the effectiveness of financial and tax management. The objective function is optimized using a structured sparse induced parametric number to calculate the data block centers to describe the data objects more comprehensively and make the obtained clustered financial results more accurate. Adding classifiers to the set of labeled samples and constraining the joined samples belonging to the wrong class combine multiple kernels from different perspectives to obtain a comprehensive measure of similarity. Selecting sub-kernel functions and parameters to construct multiple kernel functions, the learning and generalization capabilities of kernel functions, and using high-dimensional data feature vectors to construct a shared hidden subspace to maximize the similarity between prediction samples and assign greater weights in the multi-perspective clustering process for corporate financial forecasting and decision making. The analysis results show that using data clustering cloud finance, financial data can be collected and corrected promptly, and the budget accuracy is up to 90%, which provides important help to enterprise financial decision-making.

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Mechanical Bending Strain-Actuated Modulation of Metal–Insulator Transition Temperature in Flexible Epitaxial V₂O₃ Films

Liu,

Chen

2024

ACS Appl. Electron. Mater.

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In the era of the Internet of Things, flexible oxide electronics have been intensely investigated due to their unique advantages in portability, pliability, and stability. Among various oxide material systems, correlated electron materials (CEMs) have attracted significant attention, because they can display a broad range of intriguing phenomena such as colossal magnetoresistance, high-temperature superconductivity, and a metal–insulator transition (MIT). Tuning the electronic properties of CEMs featuring MIT behavior through the use of external stimuli is a prerequisite for developing CEM-based devices. Here we report a strong mechanical bending strain-actuated modulation of the MIT temperature (T MIT ) in flexible V2O3/mica heterostructures. The epitaxial V2O3 thin films on flexible mica substrates were prepared by a pulsed-laser deposition (PLD) technique. Depending on the growth conditions, various lattice parameter ratios (c/a) and distinct different electronic transport properties were found in a series of V2O3/mica films. For the V2O3 films with c/a = 2.84 and 2.82, MIT behaviors were observed at T MIT ≈ 155 K and ≈ 172 K, respectively. Mechanical bending strain imposed from buckling the mica substrates was shown to remarkably modulate the T MIT (ΔT MIT ≈ 30 K) in these flexible V2O3 films. Additionally, we note that the bending response of T MIT in the V2O3 films relies on the applied bending strain direction. Bending cyclic tests manifest a good repetition of the experimental results and superior mechanical durability in flexible V2O3 films. The present work is highly instructive for flexible electronic device applications and provides an alternative platform for studying MIT behaviors of the CEMs in general.

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Uniform structural phase transition in V2O3 without short-range distortions of the local structure

Cited by 4 publications

References 63 publications

Facile Synthesis and Single-Switch Antenna Application of Germanium-Doped Vanadium Dioxide

Facile Synthesis and Single-Switch Antenna Application of Germanium-Doped Vanadium Dioxide

Application of cloud accounting in enterprise financial forecasting and decision making in the era of big data

Mechanical Bending Strain-Actuated Modulation of Metal–Insulator Transition Temperature in Flexible Epitaxial V₂O₃ Films

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Uniform structural phase transition in V2O3 without short-range distortions of the local structure

Cited by 4 publications

References 63 publications

Facile Synthesis and Single-Switch Antenna Application of Germanium-Doped Vanadium Dioxide

Facile Synthesis and Single-Switch Antenna Application of Germanium-Doped Vanadium Dioxide

Application of cloud accounting in enterprise financial forecasting and decision making in the era of big data

Mechanical Bending Strain-Actuated Modulation of Metal–Insulator Transition Temperature in Flexible Epitaxial V2O3 Films

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Mechanical Bending Strain-Actuated Modulation of Metal–Insulator Transition Temperature in Flexible Epitaxial V₂O₃ Films