光散射学报, 2019, 31 (1): 31, 网络出版: 2019-04-16  

雪宝顶扁平状绿柱石的显微振动光谱研究

Micro-vibrational Spectroscopy of Tabular Beryl from Xuebaoding
王平 1,2,*高福华 1,2
作者单位
1 四川大学物理科学与技术学院, 成都 610064
2 四川大学中英联合材料研究所, 成都 610064
摘要
四川绵阳雪宝顶绿柱石由于其独特的透明扁平状结构而备受关注, 目前其扁平状形成原因还存在分歧。本文应用显微振动光谱及成像, 结合化学定量检测, 对雪宝顶绿柱石进行了深入分析。显微红外成像表明通道中除了水分子, 还存在铁合水离子和二氧化碳分子, 且在晶体中不均匀分布。Li元素替换Be元素会造成Be-O四面体和Al-O八面体结构畸变, 表现为晶格振动模式的拉曼峰位向高波数偏移。同时, 通道中水分子与Na结合, 使其极化率减小, 表现为伸缩振动模式的拉曼峰位向低波数偏移。本文研究为探究雪宝顶绿柱石扁平状成因提供了基础, 为研究单个水分子量子态提供了参考。
Abstract
The beryl from Xuebaoding, Mianyang, Sichuan, China has attracted much attention because of its unique transparent tabular shape.However, there are still different opinions about the real reason of the tabular shape.In this study, the micro-vibrational spectroscopy combined with quantitative chemical component is used to analyze the Xuebaoding beryl further.The micro-IR mapping shows that there are not only water molecules but also water-Fe3+ ions and carbon dioxides in the channel.They distribute unevenly in the crystal.Element substitution between Li and Be will cause structural distortion of Be-O tetrahedron and Al-O octahedron which can be reflected as the lattice vibrational bands blue-shift in the Raman spectroscopy.Meanwhile, the stretch mode band of water molecule shows red-shift in Raman spectroscopy because of the reduced polarizability caused by combining with Na+ in the channel.This study provides not only a further understanding for exploring the genesis of the tabular habit of Xuebaoding beryl, but also a reference for studying the quantum state of a single water molecule.

王平, 高福华. 雪宝顶扁平状绿柱石的显微振动光谱研究[J]. 光散射学报, 2019, 31(1): 31. WANG Ping, GAO Fuhua. Micro-vibrational Spectroscopy of Tabular Beryl from Xuebaoding[J]. The Journal of Light Scattering, 2019, 31(1): 31.

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