Calibration of a belt apparatus to 1800°C and 6 GPa
Calibration of a belt apparatus to 1800°C and 6 GPa
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将皮带装置校准至 1800°C 和 6 GPa
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
K. Nickel
中科院分区：
文献类型：
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作者：
G. Brey;R. Weber;K. Nickel
带式固体介质高压装置已被校准到与活塞缸装置相同的精度。这是通过确保压力和温度的高再现性以及通过校准具有良好建立的内部一致相变的系统来实现的。我们已经使用了银的熔化（Mirwald和Kennedy，1979），石英-柯石英转变（Mirwald和Masonne，1980）和石墨-金刚石边界（Kennedy和Kennedy，1976）。通过非常精确地加工炉组件的各个部件以及通过使用不污染热电偶并且具有99-100%理论密度的部件（在我们的情况下为单晶MgO和天然多晶CaF 2），可以实现实验条件的高再现性。垫圈材料必须具有明确的机械性能：其摩擦行为必须在每次实验中重现，以便冲压压力始终以相同的方式作用于压力容器和样品。工厂加工的叶蜡石符合这一要求。在采取所有预防措施的情况下，并基于上述反应，我们声称精度为±7°C和±（1%标称压力+0.05 GPa）。这相当于Mirwald等人（1975）对活塞-气缸装置的低摩擦单元给出的精度。我们的带式设备通常用于实现高达6 GPa的压力和高达1800°C的温度。
A belt type solid media high-pressure apparatus has been calibrated to the same accuracy as piston-cylinder apparatuses. This was achieved by ensuring high reproducibility of pressures and temperatures and by calibrating the system with well-established, internally consistent phase transitions. We have used the melting of silver (Mirwald and Kennedy, 1979), the quartz-coesite transition (Mirwald and Masonne, 1980), and the graphite-diamond boundary (Kennedy and Kennedy, 1976). High reproducibility of experimental conditions can be achieved by machining the various components of the furnace assembly very accurately and by using components which do not contaminate the thermocouple and have 99–100% theoretical density (in our case single-crystal MgO and natural polycrystalline CaF2). It is essential that the gasket material has well-defined mechanical properties: its friction behavior must be reproducible in each experiment so that the ram pressure always acts on the pressure vessel and the sample in the same way. Factory-processed pyrophyllite fulfills this requirement. With all precautions taken and on the basis of the reactions cited above, we claim an accuracy of ±7°C and ±(1% nominal pressure+0.05 GPa). This corresponds to the accuracy given by Mirwald et al. (1975) for a low-friction cell for a piston-cylinder apparatus. Our belt apparatus is used routinely to achieve pressures up to 6 GPa and temperatures up to 1800°C.