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Nanocrystalline NbC formation from mesostructured niobium oxide studied by HRTEM, SAED and in situ XRD

Paper ID Volume ID Publish Year Pages File Format Full-Text
44358 46019 2006 7 PDF Available
Title
Nanocrystalline NbC formation from mesostructured niobium oxide studied by HRTEM, SAED and in situ XRD
Abstract

Mechanism of the nanometric size niobium carbide synthesis from mesostructured niobium oxide precursor is proposed. High-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) combined with in situ X-ray diffraction (XRD) were successfully used to study phase transitions during formation of niobium carbide. The results showed the importance of oxygen diffusion during the entire carburization process; it was evidenced that oxygen diffusion may be a rate-determining step. The proposed model involves the dynamic balance between processes of carbon diffusion into the bulk of the precursor and oxygen diffusion towards the gas phase (both running in spatially separated areas) and rationalizes the observed differences between nano- and micro-crystalline niobium carbide formation.

Keywords
Carbides; Synthesis; Carburization model; Carbide layer
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Nanocrystalline NbC formation from mesostructured niobium oxide studied by HRTEM, SAED and in situ XRD
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 307, Issue 2, 3 July 2006, Pages 205–211
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
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