HIGH-PRESSURE REACTIONS AND FORMATION MECHANISM OF CUBIC BN IN THE SYSTEM BN-MG3N2

被引：21

作者：

NAKANO, S

IKAWA, H

FUKUNAGA, O

机构：

[1] Department of Inorganic Materials, Tokyo Institute of Technology, Muguro-ku, Tokyo, 152

来源：

关键词：

D O I：

10.1016/0925-9635(93)90164-W

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High pressure and high temperature reactions in the system BN-Mg3N2 were examined to investigate the formation mechanism of cubic boron nitride. An unidentified phase (X-phase) was obtained in the composition between Mg3BN3 and Mg3N2. The X-phase reacts with BN to form Mg3BN3 at high pressure. We found no evidence of the decomposition reaction of the X-phase to form cubic BN. Only Mg3BN3 was confirmed as an intermediate compound in the system BN-Mg3BN3. The Mg3BN3 showed high pressure phase transformation. The phase boundary between Mg3BN3(L) and Mg3BN3(H) was determined to be P = 7.2-0.0035 T (GPa, degrees-C). The formation mechanism of cubic BN in this system was dissolution and precipitation of cubic BN in the eutectic liquid of the pseudobinary BN-Mg3BN3 system. We found no evidence of cubic BN formation by solid state decomposition of the intermediate compound in the system BN-Mg3N2.

引用

页码：1168 / 1174

页数：7

共 18 条

[1] THE QUARTZ-REVERSIBLE-COESITE TRANSFORMATION - A PRECISE DETERMINATION AND THE EFFECTS OF OTHER COMPONENTS [J].