Preparation and properties of boron thin films

Kamimura, Kazuo; Nagaoka, Takeji; Shinomiya, Toshio; Nakao, Masato; Onuma, Yoshiharu; Makimura, Mika

doi:10.1016/s0040-6090(98)01676-9

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…Note that pyrolysis of decaborane at a pressure of about 10 −2 Pa results in α-rhombohedral boron [18,21]. Thus, pressure is a key factor in the pyrolysis of decaborane.…”

Section: Pyrolysis Of Decaboranementioning

confidence: 99%

High-pressure high-temperature synthesis and structure of α-tetragonal boron

Екимов

Зибров

2011

Science and Technology of Advanced Materials

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To cite this article: Evgeny A Ekimov & Igor P Zibrov (2011) High-pressure high-temperature synthesis and structure of α-tetragonal boron, Science Abstract Microcrystals of α-tetragonal (α-t) boron with unit cell parameters a = 9.05077(6) and c = 5.13409(6) Å and measured density 2.16-2.22 g cm −3 were obtained by pyrolysis of decaborane B 10 H 14 at pressures of 8-9 GPa and temperatures of 1100-1600• C. The crystal structure is in good agreement with the model proposed by Hoard et al (1958 J. Am. Chem. Soc. 80 4507). However, compared to the original model, we found small deformations of icosahedra and changes in the interatomic distances within the unit cell of the synthesized α-t boron.

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“…Note that pyrolysis of decaborane at a pressure of about 10 −2 Pa results in α-rhombohedral boron [18,21]. Thus, pressure is a key factor in the pyrolysis of decaborane.…”

Section: Pyrolysis Of Decaboranementioning

confidence: 99%

High-pressure high-temperature synthesis and structure of α-tetragonal boron

Екимов

Зибров

2011

Science and Technology of Advanced Materials

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“…It is known to decompose on surfaces at temperatures as low as 200 ºC to give boron films [11,15,18,19]. By adjusting the experimental procedure, we find that decaborane can also serve as a convenient starting material for the laboratory-scale preparation of boron nanoparticles.…”

Section: Ii11 Synthesis and Functionalization Of Boron Nanoparticlesmentioning

confidence: 95%

“…Boron nanoparticles have also been obtained by reduction of boron trihalides with H 2 [5] or sodium naphthalenide [8]. Boron nanowires [9,10] and thin films [11][12][13][14][15][16][17][18][19][20] have been grown by a variety of methods.…”

Section: Ii11 Synthesis and Functionalization Of Boron Nanoparticlesmentioning

confidence: 99%

Nano Engineered Energetic Materials (NEEM)

Dlott¹,

Eden²,

Girolami³

et al. 2011

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. The ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report ABSTRACTThe ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report provides a summary of the accomplishments. In particular, new methods to generate metal nanoclusters were developed that are stabilized against environmental degradation while preserving their high energy content. Rapid expansion supercritical solution processes were developed and applied to synthesize nanosized particulate oxidizers and energetic oxidizer shell/fuel core composites. Surface science and experimental chemistry methods were applied to study the structures and energy releasing reaction pathways of NEEMs. Unique diagnostic capabilities were developed and applied to study the fundamental mechanisms that underlie NEEM dynamic performance. Combustion mechanisms of various NEEMs, including nanothermites and nanoparticulate fuel/liquid oxidizer systems, were experimentally analyzed. The reactive and thermal characteristics of NEEMs were studied using large (billion atoms) multiscale simulations that couple quantum-mechanical calculations to molecular dynamics calculations. In particular, the stability, structure and energetics of metallic nanoparticles with a special focus on the relationships between particle size, shape and excess surface free energy were studied. A unified theory of ignition and combustion of aluminum particles for a wide range of sizes, from nano to meso scales was established. . 12, 777-787 (2010 (b) Papers published in non-peer-reviewed journals or in conference proceedings (N/A for none)18.00 Number of Papers published in peer-reviewed journals:Number of Papers published in non peer-reviewed journals:1. USC group, "Multibillion-atom simulations of nano-mechano-chemistry on petaflops computers," First

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A review on the methods of preparation of elemental boron

Zhou

Bai

2015

Asia-Pacific J Chem Eng

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The review presents four main techniques of preparation of elemental boron: molten salt electrolysis, metallic reduction, hydrogen reduction, and decomposition of boron compounds. For electrolysis, the molten salt systems, boron precursors, and mechanisms are summarized. Four kinds of hydrogen reduction of boron compounds are briefly introduced. In chemical vapor deposition process, the purity, conversion rate, morphology, and deposition rate of the produced boron are major concerns. Like hydrogen reduction, decomposition of boron compounds can be used to produce the high-purity and ultra-fine boron, but high-cost and severe reaction conditions limit its applications in large scale. Metal reduction method is improved through new preparation and purification process. All in all, boron powders with high-purity, small size, and narrow size distribution are preferred in the high-tech fields. Additionally, the robust boron nanostructures and more effective and greener synthetic strategies are also anticipated. Figure 3. The flowchart of reduction of boron halides by hydrogen (X refers to F, Cl, Br, or I).Figure 4. The flowchart of reduction of boron compounds with metals. Figure 6. Sketch of the novel procedure to produce nano-sized and amorphous boron.

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Preparation and properties of boron thin films

Cited by 12 publications

References 5 publications

High-pressure high-temperature synthesis and structure of α-tetragonal boron

High-pressure high-temperature synthesis and structure of α-tetragonal boron

Nano Engineered Energetic Materials (NEEM)

A review on the methods of preparation of elemental boron

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