含白云石天然碳酸盐岩在中红外波段的辐射特性研究  

A study of the middle infrared emission properties of dolomitic natural carbonate rock

作　　者：朱莹 丁竑瑞[1] 李艳[1] 黎晏彰 鲁安怀[1] 王长秋[1] ZHU Ying;DING Hong-rui;LI Yan;LI Yan-zhang;LU An-huai;WANG Chang-qiu(Key Laboratory of Orogenic Belts and Crustal Evolution,Beijing Key Laboratory of Mineral Environmental Function,Peking University,Beijing 100871,China)

机构地区：[1]北京大学造山带与地壳演化教育部重点实验室矿物环境功能北京市重点实验室北京大学地球与空间科学学院

出　　处：《岩石矿物学杂志》2019年第6期743-752,共10页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(41230103,41272003);国家重点基础研究发展计划(2014CB846001)~~

摘　　要：利用红外发射光谱研究了含白云石天然碳酸盐岩及主要组成矿物的红外发射光谱特征,探究了影响其红外辐射性能的因素。X射线衍射(XRD)和微区拉曼光谱(Raman)结果显示白云石(70%)、方解石(25%)和石英(5%)是该天然碳酸盐的主要组成物相。基于黑体辐射定律以及在80℃时、400~2000 cm^-1各矿物的辐射能量谱,显示碳酸盐岩、白云石、方解石和石英的发射率依次减少(1.010、1.000、0.997、0.958),白云石是碳酸盐岩红外辐射性能的主要贡献者。在本文研究的温度和波长范围内,含白云石碳酸盐岩中主要组成矿物的热容是温度的函数,白云石高的热容有利于提高整体的热辐射性能;矿物颗粒直径对热辐射的传播有一定的影响,颗粒直径接近于辐射波长时热辐射出现衰减导致发射率降低;当化学键(C—O键、Si—O键)的振动出现在发射光谱窄的发射带范围内(1350~1500 cm^-1和950~1275 cm^-1)则会导致相对较高的辐射能和发射率。In this study,the authors utilized infrared emission spectroscopy to investigate the infrared emission spectrum characteristics of a kind of natural carbonate and primary phase compositions,highlighting the radiation mechanism of carbonate rock.X-ray diffraction(XRD)and Raman spectroscopy results indicate that micronanoscale dolomite(70%),calcite(25%)and quartz(5%)are the primary phase compositions,with a small amount of iron manganese oxide.On the basis of blackbody radiation theory and the radiation energy spectra of samples from 400 to 2000 cm^-1 at 80℃,the corresponding emissivity of this rock,pure dolomite,calcite and quartz are calculated as 1.010,1.000,0.997 and 0.958,respectively.Notably,the radiation energy spectrum calculated by emissivity and emission spectrum of dolomite shows high consistency with that of the natural carbonate at the same temperature,indicating that the radiation performance of the rock is mainly attributed to dolomite.Within the temperature and wavelength of this study,the heat capacity values of above minerals are the function of temperature and exhibit a positive correlation with infrared emissivity,and the highest heat capacity of dolomite benefits the enhancement of the whole thermal radiation performance of carbonate rock.The diameter of the mineral particles has a certain influence on the propagation of thermal radiation.When the diameter of particles is close to radiation wavelength,the attenuation of thermal radiation would decrease emissivity.The vibration of C—O and Si—O bonds in the narrow absorption band of emission spectrum(1350~1500 cm^-1 and 950~1275 cm^-1)would lead to relatively high radiation energy and emissivity.This study can provide theoretical reference for infrared radiation material,i.e.,using the rich and cheap natural minerals on the earth as a source of raw materials for infrared functional materials.

关 键 词：碳酸盐岩 白云石 红外发射光谱 发射率 热容 平均粒径 

分 类 号：P588.245[天文地球—岩石学] P575.4[天文地球—地质学]