超高压下碘的结构相变  

THE STRUCTURE PHASE TRANSITION OF IODINE AT HIGH PRESSURE

作　　者：陈良辰[1] 张芝婷[1] 车荣钲[1] 俞汀南 李凤英[1] 顾惠成[1] 徐丽雯[1] 王积方[1] 

机构地区：[1]中国科学院物理研究所,北京100081

出　　处：《高压物理学报》1993年第2期123-126,共4页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金资助项目.

摘　　要：采用DAC高压互光技术，在32GPa压力下，对碘进行了结构相变的研究．用耐腐蚀材料Mo作封垫，在室温和无保护气氛下袋样．采用MO内标和红宝石荧光测量近行压力被准结果表明，在21GPa时．开始发生结构相变，由面心正交相（Ⅰ相），转变为体心正交槽（Ⅱ相），体积缩小2%左右．在21～25GPa之间为两相共存区；在25GPa以上完全转变为新的高压单相（Ⅱ相）．此相变为可边相变．The structure phase transitions of iodine have been studied by using X-RATY DIFFRACTION WITH A DIAMOND ANVIL CELL AT high pressure up to 32GPa As iodine is reactive with iron inair，a cottotlon－teslstlng and high－strength peet was pllt bewee th6 dj8IllollQs，thus th samJ．can be mounted atomspheric pressyre and room temperatute.Pressure was measured in termsof the ruby fluorescence and molybdenum diffraction as an internal pressure standad Accordingto the X-ray diffratim results，jodine undergoes a Structural phase transition at 21 GPafrom face Centred orthothombic phase to body Centred OrthorhombiC phase A Change of volumeIs 2% At21～25GPa，the coexistcnce of two phases been observed． Above 25GPa，thesingle new phase of the high pressure structure appeared When peure goes inversely， thistraqnsition was found to be revesible.

关 键 词：碘 结构相变 超高压 

分 类 号：O521.2[理学—高压高温物理]