{"title":"高压高温下 4H 和 6H SiC 的惰性结构转变:拉曼光谱研究","authors":"Shuhou Maitani, Ryosuke Sinmyo, Takayuki Ishii, Kenji Yoza","doi":"10.1088/2399-6528/ad5410","DOIUrl":null,"url":null,"abstract":"\n We conducted Raman spectroscopy measurements of 4H-SiC and 6H-SiC up to 69 GPa and 1023 K to assess the stability and bonding of SiC at high pressure and temperature. Both optic and acoustic modes were observed at wide pressure and temperature ranges for the first time. The temperature shifts of the Raman frequencies were fitted by the equation with the Bose-Einstein distribution function, and we found that the shifts were almost insensitive to the pressure. The mode Grüneisen coefficients weakly depend on the pressure and temperature, suggesting the sluggish transition of the crystal structure, unlike the previous experiments showing the transition or decomposition of SiC at high pressure and temperature conditions. Inert transitions are confirmed by Raman measurements and annealing experiments using multiple high-pressure apparatuses. The crystallinity may be a hidden critical parameter in the experiments to determine the stable polytypes of SiC under high pressure and temperature.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":"6 8","pages":""},"PeriodicalIF":16.4000,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Inert structural transition in 4H and 6H SiC at high pressure and temperature: A Raman spectroscopy study\",\"authors\":\"Shuhou Maitani, Ryosuke Sinmyo, Takayuki Ishii, Kenji Yoza\",\"doi\":\"10.1088/2399-6528/ad5410\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n We conducted Raman spectroscopy measurements of 4H-SiC and 6H-SiC up to 69 GPa and 1023 K to assess the stability and bonding of SiC at high pressure and temperature. Both optic and acoustic modes were observed at wide pressure and temperature ranges for the first time. The temperature shifts of the Raman frequencies were fitted by the equation with the Bose-Einstein distribution function, and we found that the shifts were almost insensitive to the pressure. The mode Grüneisen coefficients weakly depend on the pressure and temperature, suggesting the sluggish transition of the crystal structure, unlike the previous experiments showing the transition or decomposition of SiC at high pressure and temperature conditions. Inert transitions are confirmed by Raman measurements and annealing experiments using multiple high-pressure apparatuses. The crystallinity may be a hidden critical parameter in the experiments to determine the stable polytypes of SiC under high pressure and temperature.\",\"PeriodicalId\":1,\"journal\":{\"name\":\"Accounts of Chemical Research\",\"volume\":\"6 8\",\"pages\":\"\"},\"PeriodicalIF\":16.4000,\"publicationDate\":\"2024-06-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Accounts of Chemical Research\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1088/2399-6528/ad5410\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1088/2399-6528/ad5410","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
我们对高达 69 GPa 和 1023 K 的 4H-SiC 和 6H-SiC 进行了拉曼光谱测量,以评估 SiC 在高压和高温下的稳定性和结合情况。首次在较宽的压力和温度范围内观察到光学和声学模式。我们用玻色-爱因斯坦分布函数方程拟合了拉曼频率的温度偏移,发现温度偏移对压力几乎不敏感。模式格吕尼森系数对压力和温度的依赖性很弱,表明晶体结构的转变缓慢,这与之前的实验表明碳化硅在高压和高温条件下发生转变或分解不同。拉曼测量和使用多种高压设备进行的退火实验证实了惰性转变。在实验中,结晶度可能是一个隐藏的关键参数,用于确定在高压和高温条件下稳定的多晶型碳化硅。
Inert structural transition in 4H and 6H SiC at high pressure and temperature: A Raman spectroscopy study
We conducted Raman spectroscopy measurements of 4H-SiC and 6H-SiC up to 69 GPa and 1023 K to assess the stability and bonding of SiC at high pressure and temperature. Both optic and acoustic modes were observed at wide pressure and temperature ranges for the first time. The temperature shifts of the Raman frequencies were fitted by the equation with the Bose-Einstein distribution function, and we found that the shifts were almost insensitive to the pressure. The mode Grüneisen coefficients weakly depend on the pressure and temperature, suggesting the sluggish transition of the crystal structure, unlike the previous experiments showing the transition or decomposition of SiC at high pressure and temperature conditions. Inert transitions are confirmed by Raman measurements and annealing experiments using multiple high-pressure apparatuses. The crystallinity may be a hidden critical parameter in the experiments to determine the stable polytypes of SiC under high pressure and temperature.
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.