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新型BCN化合物的结构表征和相转变
引用本文:白锁柱,姚斌,郑大方,邢国忠,苏文辉.新型BCN化合物的结构表征和相转变[J].物理学报,2006,55(11):5740-5744.
作者姓名:白锁柱  姚斌  郑大方  邢国忠  苏文辉
作者单位:(1)吉林大学测试科学实验中心,长春 130023; (2)吉林大学物理学院,长春 130023; (3)吉林大学物理学院,长春 130023;内蒙古民族大学化学学院,通辽 028043; (4)吉林大学物理学院,长春 130023;中国科学院长春光学精密机械与物理研究所激发态重点实验室,长春 130033
基金项目:国家自然科学基金;高等学校博士学科点专项科研项目;吉林大学校科研和教改项目
摘    要:将石墨和六方氮化硼(h-BN)混合粉球磨120h形成的非晶B-C-N粉在4.5GPa,1600K等温退火45min. XRD,TEM和Raman散射测量结果表明,高压合成的产物由晶格常数为a1=0.2551nm,c1=0.6716nm的六方Ⅰ相和a2=1.2360nm,c2=0.8570nm的六方Ⅱ相组成,其中六方Ⅱ相为B-C-N 新相. 在室温该新相在1279,1368,1398cm-1出现三个特征Raman峰. 变温Raman测量结果表明,在测量温度T=93K时,样品中的主要相为六方Ⅰ相,随着温度的升高,六方Ⅰ相逐渐向六方Ⅱ相转变,当T>473K时,六方Ⅰ相完全转变成六方Ⅱ相. 当温度从673K降到93K过程中,样品又从六方Ⅱ相逐渐变回到六方Ⅰ相. 对这一相变的机理进行了讨论. 关键词: B-C-N 机械球磨 高温高压 相转变

关 键 词:B-C-N  机械球磨  高温高压  相转变
文章编号:1000-3290/2006/55(11)/5740-05
收稿时间:03 26 2006 12:00AM
修稿时间:2006-03-262006-06-14

Structural characterization and phase transition of an unknown phase of boron carbon nitride compound
Bai Suo-Zhu,Yao Bin,Zheng Da-Fang,Xing Guo-Zhong,Su Wen-Hui.Structural characterization and phase transition of an unknown phase of boron carbon nitride compound[J].Acta Physica Sinica,2006,55(11):5740-5744.
Authors:Bai Suo-Zhu  Yao Bin  Zheng Da-Fang  Xing Guo-Zhong  Su Wen-Hui
Institution:1.College of Physics, Jilin University, Changchun 130023, China ; 2. Chemistry College, Inner Mongolia University for Nationalities, Tongliao 028043, China ;3. Key Laboratory of Excited State Processes, Chinese Academy of Science, Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences, Changchun 130033, China;4.Testing Scientific Experimentation Center of Jilin University, Changchun 130023, China
Abstract:Amorphous BCN was prepared by ball milling the mixture of graphite and hexagonal BN for 120h, and then annealed for 45 min. at 1600K under 4.5GPa. The XRD,TEM and Raman scattering measurement indicated that the as-prepared sample consists of hexagonal phase Ⅰ with lattice constants a1=0.2551nm and c1=0.6716nm and hexagonal phase Ⅱ with lattice constants a2=1.2360nm and c2=0.8570nm, of which the hexagonal phase Ⅱ is an unknown phase of boron carbon nitride. Three characteristic Raman peaks located at 1279, 1368 and 1398cm-1 respectively, were observed in the Raman spectra recorded at room temperature. The temperature dependent Raman scattering spectra of the sample were taken at temperature ranging from 93 to 673K.The measuring results indicate that the hexagonal phase of Ⅰ mainly exist in the sample at 93K and hexagonal phase of Ⅰ convert to hexagonal phase of Ⅱ completely when at above 473K.The phase transition from the hexagonal phase of Ⅰ to Ⅱ occurs with increasing temperature, vice versa. The mechanism of the phase transition is discussed in the present work.
Keywords:B-C-N
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