X‐ray Diffraction Study of the Structure of Silicon Nitride Fiber Made from Perhydropolysilazane

Yokoyama, Yasuharu; Nanba, Tokuro; Yasui, Itaru; Kaya, Hiroshi; Maeshima, Tsugio; Isoda, Takeshi

doi:10.1111/j.1151-2916.1991.tb04076.x

Cited by 58 publications

(16 citation statements)

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“…Interestingly, a-Si 3 N 4 produced using pyrolysis or sol-gel methods, has a density of 2.27-2.44 g/cm 3 , consistent with the predictions from NPT anneal density. 54 The accurate prediction of the range of experimental densities is unprecedented and represents a key validation of our approach.…”

Section: Distribution Of Cohesive Energy Density and Bulk Modulusmentioning

confidence: 99%

Effect of topological disorder on structural, mechanical, and electronic properties of amorphous silicon nitride: An atomistic study

2012

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ABSTRACT:We present a first principles study of the effect of atomic variability on the structure, mechanical and electronic properties of amorphous silicon nitride. Using a combination of molecular dynamics and density functional theory calculations we predict an ensemble of statistically independent, well-relaxed and stress-free amorphous silicon nitride structures. We analyze the short, intermediate, and long-range order of the structures generated using radial distribution functions, ring statistics, bond angle distributions, and translational invariance parameters. Though energetically very similar, these structures span a wide range of densities (2.75-3.25 g/cm 3 ) and bulk moduli (115GPa to 220 GPa) in good agreement with the fabrication-dependent experimental range. Chemical bonds and atomic defects are identified via a combination of bond distance cutoff and maximally localized Wannier function analysis. A significant number of the amorphous structures generated (~30%) are defect-free providing an ideal reference to characterize the formation energy of the various point defects and their defect energy levels. An analysis of the Kohn-Sham density of states and energetics of the structures reveals that defects in amorphous dielectrics have a distribution of associated properties (e.g. formation energies and electronic energy levels) due to variations in local atomic structure; this should be taken into consideration in physics-based continuum models of these materials.

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Section: Distribution Of Cohesive Energy Density and Bulk Modulusmentioning

confidence: 99%

Effect of topological disorder on structural, mechanical, and electronic properties of amorphous silicon nitride: An atomistic study

2012

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“…90 This high-purity silicon nitride fiber possessed high strength, a modulus of elasticity, and thermal stability, which are properties suitable for reinforcing plastics, metals, glasses, and even ceramics.…”

Section: 85mentioning

confidence: 99%

Pyrolytic Organic-to-Inorganic Conversion of Precursors into AlN-A Review

Mori¹,

Sugahara²

2006

J. Ceram. Soc. Japan

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ሱᑿ-ᠪᑿং၁ɟɵɃɁǺȗȚ AlN ǽΰ⓯ ἕ◻ ᎓ ؊͒ɿ≐‫ڤ‬ῲ˴ ᅤᨀগકᥴకકȤඅ᧸‫ك‬કᲇࢫ169-8555 ኇ̸ȩᄽٚগ˳Є 3-4-1 Pyrolyticéorganic-to-inorganicêconversion of precursors preceramic materials into aluminum nitride AlN has been investigated for the past few decades. AlN precursors can be classified based on their starting aluminum compounds organoaluminum compounds, inorganic compounds containing aluminum, and metallic aluminum. The preparation of various AlN precursors and their conversion mechanisms during pyrolysis are reviewed.

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“…Low-carboncontaining and carbon-free polysilazanes are obtained by the reaction of [(CH 3 ) 3 Si] 2 NH with HSiCl 3 and by ammonolysis of SiH 2 Cl 2 Á2pyridine, respectively, and are also produced commercially. 27,28 Pyrolysis of cross-linked polysilazanes like 1 yields the desired ceramic. The applied reaction atmosphere, (argon, nitrogen or ammonia) determines the composition of the final product according to the following simplified reaction equations (Eqns [9] and [10] silane reacts with ammonia to form specific molecules, shown in Eqn [3].…”

Section: Materials In the Ternary System Si±c±nmentioning

confidence: 99%

Cyclosilazanes and borazines: polymer precursors to silicon- and boron-containing ceramics

Jaschke

Klingebiel

Riedel

et al. 2000

Appl. Organometal. Chem.

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The chemistry of cyclosilazanes and borazines is a topic of current interest in view of preceramic polymers which yield on pyrolysis various useful ceramic materials, e.g. silicon and boron carbide, silicon and boron nitride, and ternary or quaternary mixtures of these materials. These materials are hard and have high oxidative and thermal stability. Other useful properties are resistance to corrosion, thermal shock and creep, low electrical conductivity and low coefficient of thermal expansion. One of the best application prospects is the use of the preceramic polymers as protective coating material for carbon fibres.

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X‐ray Diffraction Study of the Structure of Silicon Nitride Fiber Made from Perhydropolysilazane

Cited by 58 publications

References 1 publication

Effect of topological disorder on structural, mechanical, and electronic properties of amorphous silicon nitride: An atomistic study

Effect of topological disorder on structural, mechanical, and electronic properties of amorphous silicon nitride: An atomistic study

Pyrolytic Organic-to-Inorganic Conversion of Precursors into AlN-A Review

Cyclosilazanes and borazines: polymer precursors to silicon- and boron-containing ceramics

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