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Development of anvil with sintered diamond core for high pressure high temperature experiments

高压高温实验用烧结金刚石芯砧座的研制

基本信息

批准号：
01840029
负责人：
AKAOGI Masaki
金额：
$ 5.18万
依托单位：
Gakushuin University (1990-1991)Kanazawa University (1989)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01840029/
关键词：
Ultra-high pressure sintered diamond phase transition Bridgman anvil 高温高圧実験アンビル

项目摘要

The purpose of this research project is to develop anvils with sintered diamond cores and to generate high pressures and high temperatures using the new anvils. We have developed two kinds of Bridgman anvils which consist of tungsten carbide with sintered diamond core. The diameters of tlie anvils are 26 and 20 mm. We have also constructed a 600-ton press, which is used to compress the Bridgman anvils to generate high pressures. Using these apparatus, the following results have been obtained during this project term.1. We have successfully generated pressure up to about 20.5 GPa using the new anvils. This generated pressure is much higher than those attained by Bridgman anvils made of tungsten carbide. The new anvils have also been used for high pressure high temperature experiments up to 17 GPa and 1400 ﾟC.2. The following phase transition experiments have been caried out. Phase boundaries in KAlSi_3O_8 feldspar to K_2Si_4O_9 wadeite + Al_2SiO_5 kyanite + SiO_2 coesite (or stishovite) and further to KAlSi_3O_8 hollandite have been determined. Stability field of CaAl_2O_4 calcium ferrite has been examined. The decomposition boundary of CaFeSi_2O_6 clinopyroxene to CaSiO_3 perovskite + Fe_2SiO_4 spinel +SiO_2 stishovite has also been determined. These phase boundaries are of geophysical and geochemical importance in the lower mantle.3. As a related topic, the rutile-alphaPbO_2 transition boundary in TiO_2 has accurately been determined by in situ x-ray diffraction techniques at high pressure and high temperature. This boundary is important for pressure calibration at high temperatures.

该研究项目的目的是开发具有烧结金刚石芯的顶锤，并使用新的顶锤产生高压和高温。我们研制了两种由碳化钨和烧结金刚石芯组成的布里奇曼砧座。砧座直径分别为26 mm和20 mm。我们还建造了一台600吨的压力机，用于压缩布里奇曼砧板以产生高压。使用这些仪器，在本项目期间取得了以下成果。我们已经成功地使用新的锤子产生了高达20.5 Gpa的压力。这种产生的压力比由碳化钨制成的布里奇曼铁锤所获得的压力高得多。新的顶锤还被用于17 Gpa和1400ﾟC.2的高压高温实验。进行了以下相变实验。测定了KlSi3O8长石到K2Si4O9水晶石+Al2SiO5蓝晶石+SiO_2柯石英(或辉钛矿)，再到KlSi3O8霍兰石的相界。研究了CaAl_2O_4铁酸钙的稳定场。确定了CaFeSi2O6单斜辉石分解为CaSiO_3钙钛矿+Fe_2SiO_4尖晶石+SiO_2辉石的分解界。这些相界面在下地幔具有重要的地球物理和地球化学意义。作为相关课题，我们在高温高压下用原位X射线衍射法准确地测定了二氧化钛中金红石-α-PbO_2相变界面。这一边界对于高温下的压力校准很重要。