Acquisition of a dilatometer for accurate measurement of thermal expansivity of geologically relevant materials over -180 to 2000oC

1255774霍夫梅斯特这一地球科学仪器和设施计划拨款部门支持购买推杆膨胀仪，该仪器能够在与研究地球深层和地壳相的热演化相关的广泛温度范围(180？2000摄氏度)内高精度测量矿物、玻璃和材料的热膨胀率。这将是地球科学学术研究部门第一个这样的仪器。温度对地球物质膨胀和收缩的影响是约束地幔对流模型所需的基本性质。很少有可靠的地球深部相热膨胀性数据是在现场温度条件下获得的，并且有足够的信心为地球动力学模型提供现实的约束。国际和平研究所将利用该仪器建立一个关于各种岩土材料热膨胀性的广泛数据库，首先从与地壳和地幔有关的特征良好的单晶相和玻璃开始。PI旨在通过动手测量来吸引学生进行体验式学习。*

1255774HofmeisterThis Division of Earth Sciences Instrumentation and Facilities Program grant supports acquisition of push rod dilatometer capable of high precision measurements of the thermal expansivity of minerals, glasses and materials over a broad range of temperatures (180 ? 2000 deg C ) relevant to study of the thermal evolution of deep Earth and crustal phases. This would be the first such instrument of its kind in an Earth Sciences academic research department. The effect of temperature on the expansion and contraction of Earth materials is a fundamental property needed to constrain models of mantle convection. Few reliable data of thermal expansivity of deep Earth phases exist that were acquired at in situ temperature conditions and with sufficient confidence to provide realistic constraints on geodynamic models. The PI would use the instrument to develop an extensive database on the thermal expansivity of a wide range of geomaterials starting first with well characterized single-crystals phases and glasses relevant to the Earth's crust and mantle. The PI intends to engage students in experiential learning through hands on measurements.***