六方氮化硼在5 GPa以下的熔点测量  

Measurement of the Melting Point of Hexagonal Boron Nitride under Pressures below 5 GPa

作　　者：张瑞柯 郭睿昂 肖雄 贺端威[1] ZHANG Ruike;GUO Rui’ang;XIAO Xiong;HE Duanwei(Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学原子与分子物理研究所,四川成都610065

出　　处：《高压物理学报》2024年第6期8-16,共9页Chinese Journal of High Pressure Physics

基　　金：国家重点研发计划(2023YFA1406200)。

摘　　要：设计并组装了一套瞬间放电装置,实现了样品在DS 6×14 MN国产铰链式六面顶大腔体压机下的高压瞬间放电加热。结合大腔体静高压加载技术以及瞬间放电加热技术,利用熔体凝固过程中晶体经历形核和生长2个阶段的特征,判断晶体的熔化情况。对h-BN粉晶进行了高压环境下的瞬间放电加热处理,以研究高压下h-BN的熔化行为。采用扫描电子显微镜对高压条件下经历瞬间放电加热处理的样品进行微观形貌分析,判断h-BN晶体的熔化情况,确定了在3.4和4.3 GPa压力下h-BN的熔点分别为(4251±150)K和(4531±200)K。这些发现有利于h-BN的应用探索以及现有氮化硼高温高压相图的修正。In this study,a flash-heating device was designed and assembled to achieve instantaneous discharge heating of samples under high pressure in the DS 6×14 MN domestic hinged six-anvil large chamber press.By combining large chamber static high pressure and instantaneous discharge heating technologies,the melting state of crystals has been determined by the nucleation and growth characteristics during solidification.The melting behavior of h-BN powder crystal under high pressure was studied by instantaneous discharge heating treatment.Using scanning electron microscopy(SEM),the microstructures of samples obtained by high-pressure instantaneous discharge heating treatment was analyzed in order to assess the melting state of h-BN crystals.It was determined that the melting points of h-BN under 3.4 and 4.3 GPa are(4251±150)K and(4531±200)K,respectively.These results are beneficial for exploring the applications of h-BN and revising the existed temperature-pressure phase diagram of boron nitride.

关 键 词：瞬间放电加热法 六方氮化硼 高温高压 熔点测量 

分 类 号：O521.3[理学—高压高温物理] O521.2[理学—物理]