The influence of hBN crystallinity and additive lithium hydride on cbn synthesis in Li3N-hBN system

In this paper, the influence of hBN crystallinity and additive Lithium hydride (LiH) on cBN synthesis with Lithium nitride (Li3N) as catalyst was investigated under the pressure of 4.5-5 GPa and the temperature of 1500-1700 deg C. hBN with different crystallinities was obtained by the same hBN. Some...

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Bibliographic Details
Published in:Diamond and related materials 2007-08, Vol.16 (8), p.1475-1478
Main Authors: Du, Yonghui, Ji, Xiaorui, Yang, Xuxin, Gong, Xiliang, Yang, Dapeng, Su, Zuopeng, Zhang, Tiechen
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
General and physical chemistry
Physics
Single-crystal and powder diffraction
Structure of solids and liquids
crystallography
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
X-ray diffraction and scattering
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Summary:In this paper, the influence of hBN crystallinity and additive Lithium hydride (LiH) on cBN synthesis with Lithium nitride (Li3N) as catalyst was investigated under the pressure of 4.5-5 GPa and the temperature of 1500-1700 deg C. hBN with different crystallinities was obtained by the same hBN. Some were explored to high pressure and high temperature, and others were subjected to heat treatment with alkali. X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectronic spectroscopy (XPS) were used to characterize the property of the starting materials. The synthesized samples were observed by optical microscopy (OM). The results indicated that besides the crystallinity of hBN, which is a general parameter for controlling the structural quality of hBN powders, some other factors such as the content of B+ at the surface of hBN and additive LiH all strongly influence the synthesis of cBN.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2006.12.014