MgB2 films prepared by rapid annealing method

Dai, Qian; Kong, Xiangdong; Feng, Qian; Yang, Qianqian; Zhang, Huai; Nie, Ruijuan; Han, Li; Ma, Yanwei; Wang, Furen

doi:10.1016/j.physc.2012.01.014

Cited by 8 publications

(10 citation statements)

References 24 publications

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“…The up-limit of local temperature T max in a SEM was also revealed with our experiments on annealing of [Mg-B] N multilayered thin films. The results showed that high-intensity e-beams could induce phase transition in amorphous [Mg-B] N multilayered thin films within 1 s. As a result, an amorphous multilayer was partially turned into a MgB 2 superconducting phase [5–7]. Figure 3 and Table 2 present some typical results.…”

Section: Resultsmentioning

confidence: 94%

“…For some applications, in e-beam lithography for instance, this e-beam-induced surface heat may cause distortion of designed patterns at the nanoscale in the e-beam writing process, thus resulting in failure of the final devices [1–3]. In some other applications, the local surface heating effect is utilized for thin film deposition [4], annealing [5–7], or even sculpting of nanomaterials [8, 9]. Yet to date, precise measurement and evaluation of the local surface temperatures under e-beam irradiation remain as a technical challenge [10–12].…”

Section: Introductionmentioning

confidence: 99%

“…With careful operation procedures, one could use an e-beam to make a bridge of single-atom chain of carbon from a continuous carbon thin film [9]. Using e-beams as in situ energy sources, one could obtain superconducting MgB 2 phase from a multilayered [Mg-B] n “superlattice” film [5–7].…”

Section: Introductionmentioning

confidence: 99%

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Measurement and Evaluation of Local Surface Temperature Induced by Irradiation of Nanoscaled or Microscaled Electron Beams

et al. 2019

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Electron beams (e-beams) have been applied as detecting probes and clean energy sources in many applications. In this work, we investigated several approaches for measurement and estimation of the range and distribution of local temperatures on a subject surface under irradiation of nano-microscale e-beams. We showed that a high-intensity e-beam with current density of 105-6 A/cm2 could result in vaporization of solid Si and Au materials in seconds, with a local surface temperature higher than 3000 K. With a lower beam intensity to 103-4 A/cm2, e-beams could introduce local surface temperature in the range of 1000–2000 K shortly, causing local melting in metallic nanowires and Cr, Pt, and Pd thin films, and phase transition in metallic Mg-B films. We demonstrated that thin film thermocouples on a freestanding Si3N4 window were capable of detecting peaked local surface temperatures up to 2000 K and stable, and temperatures in a lower range with a high precision. We discussed the distribution of surface temperatures under e-beams, thermal dissipation of thick substrate, and a small converting ratio from the high kinetic energy of e-beam to the surface heat. The results may offer some clues for novel applications of e-beams.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Measurement and Evaluation of Local Surface Temperature Induced by Irradiation of Nanoscaled or Microscaled Electron Beams

et al. 2019

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“…MgB 2 films annealed in RTP method exhibit more flat surface than post annealed ones, and less interdiffusion and oxidation [11]. This used to be two major difficulties to prepare Josephson junctions base on MgB 2 thin films.…”

Section: Bottom Mgb 2 Film Characteristicsmentioning

confidence: 99%

“…Recently, several groups [11,12] reported MgB 2 thin films annealed by rapid thermal process (RTP), which considerably suppressed the reaction between layers, and improved the superconducting properties of the films without roughening their smooth surfaces. We believe this approach is reliable and reproducible to obtain MgB 2 Josephson junctions.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of sandwich-type MgB2/Boron/MgB2 Josephson junctions with rapid annealing method

Song

Wang

Junli

et al. 2015

Journal of Alloys and Compounds

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Iridescent Daytime Radiative Cooling with No Absorption Peaks in the Visible Range

Ding

Pattelli

Xü

et al. 2022

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Traditional cooling technologies suffer from several limitations: basically, they all rely on electricity, have high energy needs, and discharge waste heat into the surrounding environment which in turn contributes to global warming and the urban heat island effect. [2][3][4] For these reasons, the recent development of passive radiative sky cooling materials is attracting a growing interest due to its environmentally friendly nature and energy-free working principle. [5] In recent years, hundreds of candidate materials have been proposed, offering a range of passive cooling performances during daytime hours and even under direct sunlight. Two essential requirements for sub-ambient radiative cooling under direct sunlight are a high reflectivity above 90% in the solar spectral range (0.25-2.5 µm), and a strong, preferably selective emissivity in the atmospheric transparency window (8-13 µm). [6,7] This demanding combination of optical properties is generally achieved through both the selection of specific materials with appropriate absorption bands and the micro and nanoengineering of coatings. These materials can be generally divided into four main categories, namely dielectric multilayer films, [8][9][10][11][12] organic-inorganic composite materials, [13][14][15] Coatings for passive radiative cooling applications must be highly reflected in the solar spectrum, and thus can hardly support any coloration without losing their functionality. In this work, a colorful daytime radiative cooling surface based on structural coloration is reported. A designed radiative cooler with a bioinspired array of truncated SiO 2 microcones is manufactured via a self-assembly method and reactive ion etching. Complemented with a silver reflector, the radiative cooler exhibits broadband iridescent coloration due to the scattering induced by the truncated microcone array while maintaining an average reflectance of 95% in the solar spectrum and a high thermal emissivity (ε) of 0.95, owing to the reduced impedance mismatch provided by the patterned surface at infrared wavelengths, reaching an estimated cooling power of ≈143 W m -2 at an ambient temperature of 25 °C and a measured average temperature drop of 7.1 °C under direct sunlight. This strong cooling performance is attributed to its bioinspired surface pattern, which promotes both the aesthetics and cooling capacity of the daytime radiative cooler.

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MgB2 films prepared by rapid annealing method

Cited by 8 publications

References 24 publications

Measurement and Evaluation of Local Surface Temperature Induced by Irradiation of Nanoscaled or Microscaled Electron Beams

Measurement and Evaluation of Local Surface Temperature Induced by Irradiation of Nanoscaled or Microscaled Electron Beams

Fabrication of sandwich-type MgB2/Boron/MgB2 Josephson junctions with rapid annealing method

Iridescent Daytime Radiative Cooling with No Absorption Peaks in the Visible Range

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