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- W2025001014 abstract "Amorphous B−C−N ceramics were produced by thermolysis of poly(borosesquicarbodiimide) of idealized formula [B2(NCN)3]n at 1100 °C in an argon atmosphere. Their structure was investigated by X-ray and neutron diffraction. Wide-angle diffraction showed that the ceramics consist of an amorphous structure with hexagonal planar near-range ordered atomic arrangements similar to graphite. Additionally, magic-angle spinning nuclear magnetic resonance (MAS NMR) studies demonstrated that boron is preferentially trigonally bonded to nitrogen. Small-angle scattering (SAS) experiments revealed that the as-thermolyzed ceramics are inhomogeneous. By combined small-angle X-ray and neutron scattering experiments the medium-range order and its temperature dependency were investigated. Contrast variation studies using isotopic substitution (natN vs 15N) suggest that the ceramics contains sub-microscopic pores. The Guinier radius (RG) of the pores increases upon annealing. Positron annihilation investigations of the ceramics also revealed the presence of nanopores." @default.
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- W2025001014 date "2002-06-25" @default.
- W2025001014 modified "2023-10-17" @default.
- W2025001014 title "X-ray and Neutron Scattering and Solid State NMR Investigations on Precursor-Derived B−C−N Ceramics Using Isotopic Substitution" @default.
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- W2025001014 doi "https://doi.org/10.1021/cm011081g" @default.
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