Thermal conductivity of platinum and periclase under extreme conditions of pressure and temperature
Thermal conductivity of platinum and periclase under extreme conditions of pressure and temperature
复制标题
极端压力和温度条件下铂和方镁石的导热性
DOI：
10.1080/08957959.2023.2193892
复制
发表时间：
2023
影响因子：
2
通讯作者：
Hirose Kei
中科院分区：
文献类型：
--
作者：
Hasegawa Akira;Ohta Kenji;Yagi Takashi;Hirose Kei
采用脉冲光加热热反射技术和激光加热金刚石对顶砧装置测量了铂和MgO方镁石在高压（P）和高温（T）下的热扩散率和热导率。铂的热导率随压力和温度的增加而增加，在最高P-T值125 GPa和1850 K时，其热导率可达210 W/m/K。方镁石的热导率在140 GPa和1950 K下测定，对应于地球最低地幔，其热导率约为90 W/m/K。我们的测量使我们能够测试模型的combinedP-T依赖性的导热系数的金属和绝缘材料高达毫巴的压力和数千开尔文。
We have measured the thermal diffusivity and conductivity of platinum and MgO periclase at high pressures (P) and high temperatures (T) by combining the pulsed light heating thermoreflectance technique with a laser-heated diamond anvil cell. The obtained thermal conductivity of platinum shows positive pressure and temperature dependences, reaching about 210 W/m/K at the highestP–Tcondition of 125 GPa and 1850 K. The thermal conductivity of periclase was determined up to 140 GPa and 1950 K, corresponding to the Earth's lowermost mantle, where the conductivity was about 90 W/m/K. Our measurements allow us to test models for the combinedP–Tdependence of the thermal conductivity of both metals and insulating materials up to Mbar pressures and thousands of kelvins.