昆仑白玉的高温原位X射线衍射实验研究  

High Temperature In Situ X-ray Diffraction and Thermal Analysis Experiment Recersh for Kunlun Green Jade

作　　者：杨维丰[1] 李永得[1] 刘远[1] 胡忠山[1] 胡成西[1] 

机构地区：[1]青海师范大学物理系,青海西宁810008

出　　处：《青海师范大学学报（自然科学版）》2011年第4期21-24,共4页Journal of Qinghai Normal University(Natural Science Edition)

基　　金：教育部春晖计划资助项目(项目编号:Z2009-1-81011);国家自然科学基金项目(项目编号:11064011)

摘　　要：本文在28℃-1150℃温区对昆仑白玉进行高温原位X射线衍射实验,研究了升温和降温过程的物相变化,结果表明昆仑碧玉在常温下主相为Ca2Mg5Si8O22(OH)2,晶格参数a=9.818,b=18.047,c=5.275,α=90°,β=104.6°,γ=90°,空间群为C2/m,属于单斜晶系;升温过程中在800℃时少量杂质白云石(CaMg(CO3)2)分解,少量杂质滑石(Mg3[Si4O10](OH)2)在900℃-1050℃分解,1000℃左右透闪石结构被破坏,存在形成CaMgSi2O6的两种机制,直到1150℃阳起石结构完全被破坏,最终产物中主要是透辉石CaMgSi2O6,还有少量CaSiO3,MgSiO3;降温过程的图谱表明这种高温相变是不可逆的.In this paper, Kunlun jade were used for the in situ high temperature X--ray diffraction （HT-XRD）studies of the heating and cooling process of the phase change, results show that the Kunlun jade at room temperature, the main phase of Ca2MgsSi8O22（OH）2, lattice Parameters a=9.818A, b=18. 047A, c=5. 275A, a=90°, β=104. 6°, γ=90°, space group C2/m, belongs to monoclinic system; the heating process a small amount of impurities at 800℃ Dolomite （CaMg （CO3）2） decomposition, a small amount of impurities in talc （Mgz [Si4O10] （OH）2） decomposition at 900℃--1050℃, 1000℃ actinolite about the structure is destroyed, there are two mechanisms for the formation of CaMgSi2O6, Until 1150℃ actinolite structure was completely destroyed in the final product is mainly diopside CaMgSi2O6, there are a few CaSiO3, MgSiO3 ; cooling process of the map show that the high temperature phase transition is irreversible.

关 键 词：高温原位X射线衍射 昆仑玉 透闪石 热转变 

分 类 号：O722.4[理学—晶体学]