高温高压下杂质离子对水晶电导率影响的实验研究  

INFLUENCE OF IONIC IMPURITIES ON THE ELECTRICAL CONDUCTIVITY OF SYNTHETIC QUARTZ CRYSTALS AT HIGH TEMPERATURE AND HIGH PRESSURE

作　　者：单双明[1,2] 李和平[1] 代立东[1] 汪日平[1,2] 

机构地区：[1]中国科学院地球化学研究所地球深部物质与流体作用实验室,贵州贵阳550002 [2]中国科学院研究生院,北京100039

出　　处：《矿物学报》2009年第1期109-112,共4页Acta Mineralogica Sinica

基　　金：国家863计划项目(2006AA09Z205);国家自然科学基金项目(批准号:40573046)

摘　　要：杂质离子往往是影响水晶电导率的主要因素。在2.0GPa和823～1123K的条件下,借助交流阻抗谱法在10-1～106Hz频率范围内,就位测量了水晶Z轴方向的电导率,并用LA-ICP-MS测试了水晶中杂质Na、Al的含量。通过Arrhenius关系拟合,得出2.0GPa和823～1123K条件下水晶的活化焓和指前因子。发现水晶中杂质Na、Al的含量彼此正相关,水晶电导率与晶体中Na含量正相关,且指前因子亦与水晶中杂质Na、Al含量正相关。Ionic impurity is the most important factor affecting the electrical conductivity of synthetic quartz crystals. We measured the electrical conductivity of synthetic quartz crystals using the AC （ 10^-1 - 10^＋ Hz） complex impedance method in the temperature range between 823 and 1123 K at the pressure of 2. 0 GPa. Using the method of LA-ICP- MS, the contents of Na and A1 in the study quartz crystals were measured. By fitting the plots of lgσT vs 1/T, we got the pre-exponential factor and activation energy at 2. 0 GPa and 823 - 1123 K. It was found that： the contents of Na increased with increasing contents of AI, and in advance, with increasing contents of Na both the electrical conduc- tivity and pre-exponential factor tended to increase.

关 键 词：高温高压 水晶 电导率 杂质离子 

分 类 号：O738[理学—晶体学] P579[天文地球—矿物学]