白硅钙石的高温高压拉曼光谱研究

doi:10.3964/j.issn.1000-0593(2016)10-3404-06

CORC > 北京大学 > 地球与空间科学学院

	白硅钙石的高温高压拉曼光谱研究; Raman Spectra of Bredigite at High Temperature and High Pressure
	熊志华 ; 赵明臻 ; 何俊国 ; 李羿芃 ; 李红中
刊名	光谱学与光谱分析
	2016
关键词	白硅钙石高温拉曼高压拉曼非谐系数 Bredigite High temperature Raman High pressure Raman Anharmonic coefficients CRYSTAL-CHEMISTRY FORSTERITE MONTICELLITE WADSLEYITE SILICATES DIOPSIDE LARNITE MANTLE
DOI	10.3964/j.issn.1000-0593(2016)10-3404-06
英文摘要	利用活塞圆筒装置在1.2 GPa,1473 K的条件下合成了白硅钙石。采用外加热装置和金刚石压腔结合拉曼光谱分析技术,采集了白硅钙石298,353,463,543,663,773以及873 K温度区间的常压及1 atm~14.36 GPa(常温)压力区间的拉曼谱图。扫描电镜下,该研究合成的样品为结构一致的单一相,颗粒大小为10~20μm。电子探针分析结果表明,样品的组成为 Ca7.03(2)Mg0.98(2)Si3.94(2)O16,该组分完全吻合白硅钙石理论组分。Raman分析结果表明,高温时白硅钙石的拉曼谱图中具有29个振动峰。随着温度的升高,部分振动峰出现了合并或者弱化消失的现象。该现象尤其以800~1200 cm-1范围内的909,927和950 cm-1振动峰峰位最为明显,这些振动峰分别在873,773以及873 K时弱化消失。据此,白硅钙石的结构在实验温压范围内稳定,且随着温度和压力的升高,其拉曼振动峰峰位分别呈现往低频和高频方向线性飘移的趋势。除此之外,根据高温和高压拉曼实验的结果,分别计算了白硅钙石拉曼振动峰峰位的等压 mode-Grüneisen参数和等温mode-Grüneisen参数,其算术平均值分别为1.47(2)和0.45(3)。最后结合高温和高压拉曼实验的结果,计算了白硅钙石的非谐系数,结果表明,Si-O振动模式对于非谐效应的贡献要小于其他振动模式。; Bredigite was synthesized by using the Piston-Cylinder in 1.2 GPa and 1 473 K.With external heat-ing device and diamond anvil cell,high temperature and high pressure Raman spectra of bredigite were collect-ed at temperatures 298,353,463,543,663,773 and 873 K and with pressure from 1 atm up to 14.36 GPa (room temperature).The SEM image showed that the sample consisted of one crystalline phase with grain size ranging from 10~20μm.The EPMA data suggest a chemical formula of Ca7.03(2)Mg0.98(2)Si3.94(2)O16 which was identical to the theoretical component of bredigite.The Raman spectroscopic results indicate there were 29 vi-bration bands of bredigite at high temperature.Some bands were merging,weakening and disappearing in-creasingly with the temperature,which was obvious in the range of 800~1 200 cm-1 .The vibration bands of 909,927 and 950 cm-1 disappeared at 873,773 and 873 K,respectively.The results primarily indicated that the structure of bredigite was stable under experimental condition.In addition,isobaric mode-Grüneisen pa-rameters and isothermal mode-Grüneisen parameters were calculated,yielding 1.47(2)and 0.45(3)as their mean values,respectively.Anharmonic coefficients were estimated based on the high temperature and high pressure Raman experiments,showing that the contributions to anharmonic-effect induced with the Si—O vi-bration modes were smaller than other modes.; National Natural Science Foundation of China; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 10; 3404-3409; 36
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/458871]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	熊志华,赵明臻,何俊国,等. 白硅钙石的高温高压拉曼光谱研究, Raman Spectra of Bredigite at High Temperature and High Pressure[J]. 光谱学与光谱分析,2016.
APA	熊志华,赵明臻,何俊国,李羿芃,&李红中.(2016).白硅钙石的高温高压拉曼光谱研究.光谱学与光谱分析.
MLA	熊志华,et al."白硅钙石的高温高压拉曼光谱研究".光谱学与光谱分析 (2016).