Hydrothermal hot-pressing induced phase transition in hexagonal boron nitride

被引：11
|
作者：
Zhu, Lingling [1 ]
Tan, Miao [1 ]
Lian, Gang [2 ]
Zhang, Xiao [2 ]
Cui, Deliang [1 ]
Wang, Qilong [1 ,2 ]
机构：
[1] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China
[2] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China
来源：
SOLID STATE SCIENCES | 2009年 / 11卷 / 07期
关键词：
Boron nitride; Phase transformation; Hydrothermal hot-press; cBN nucleation; CUBIC-BN; NUCLEATION; TRANSFORMATION; SOLVENT; ALLOY; STATE; WATER;
D O I：
10.1016/j.solidstatesciences.2009.03.024
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The phase transition of hBN nanocrystals induced by hydrothermal hot-pressing process has been investigated by XRD, FTIR, TEM and HRTEM. it was found that a phase transition of hBN -> tBN -> aBN occurred with increasing hot-pressing temperature, i.e., hBN transformed into tBN at above 270 degrees C, and followed by another transformation from tBN to aBN at 310 degrees C. In addition, FTIR spectra and HRTEM images indicate that a small amount of CBN formed directly from the amorphous BN matrix at 75 MPa and 310 degrees C. This phenomenon is similar to what happened in conventional high temperature and high pressure method, which is believed to promote the phase transition from hBN to cBN. (C) 2009 Elsevier Masson SAS. All rights reserved.
引用
收藏
页码：1283 / 1287
页数：5
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