Issue 26, 2011
From the journal:

Dalton Transactions

Low-temperature solid state synthesis and in situ phase transformation to prepare nearly pure cBN†

Gang Lian,ab   Xiao Zhang,b   Miao Tan,a   Shunjie Zhang,b   Deliang Cui*a  and  Qilong Wang*b  

* Corresponding authors

a State Key Lab of Crystal Materials, Shandong University, Shanda Nanlu No.27, Jinan, P. R. China
E-mail: cuidl@sdu.edu.cn
Fax: (+86)531-88361856
Tel: (+86)531-88361856

b School of Chemistry and Chemical Engineering, Shandong University, Shanda Nanlu No.27, Jinan, P. R. China
E-mail: gang_lian2000@yahoo.com.cn
Tel: (+86)531-88365899

Abstract

Cubic boron nitride (cBN) is synthesized by a low-temperature solid state synthesis and in situ phase transformation route with NH4BF4, B, NaBH4 and KBH4 as the boron sources and NaN3 as the nitrogen source. Furthermore, two new strategies are developed, i.e., applying pressure on the reactants during the reaction process and introducing the structural induction effect. These results reveal that the relative contents of cBN are greatly increased by applying these new strategies. Finally, almost pure cBN (∼90%) crystals are obtained by reacting NH4BF4 and NaN3 at 250 °C and 450 MPa for 24 h, with NaF as the structural induction material. The heterogeneous nucleation mechanism can commendably illuminate the structure induction effect of NaF with face center cubic structure. In addition, the induction effect results in the cBN nanocrystals presenting obvious oriented growth of {111} planes.

Graphical abstract: Low-temperature solid state synthesis and in situ phase transformation to prepare nearly pure cBN

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Article information

DOI
https://doi.org/10.1039/C0DT01823F
Article type
Paper
Submitted
23 Dec 2010
Accepted
19 Apr 2011
First published
06 Jun 2011

Dalton Trans., 2011,40, 6961-6967

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Low-temperature solid state synthesis and in situ phase transformation to prepare nearly pure cBN

G. Lian, X. Zhang, M. Tan, S. Zhang, D. Cui and Q. Wang, Dalton Trans., 2011, 40, 6961 DOI: 10.1039/C0DT01823F

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