Hydrothermal hot-pressing induced phase transition in hexagonal boron nitride |
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| Authors: | Lingling Zhu Miao Tan Gang Lian Xiao Zhang Deliang Cui Qilong Wang |
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| Institution: | 1. State Key Lab of Crystal Materials, Shandong University, Jinan 250100, PR China;2. School of Chemistry & Chemical Engineering, Shandong University, Jinan 250100, PR China |
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| Abstract: | 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 °C, and followed by another transformation from tBN to aBN at 310 °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 °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. |
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