Abstract
Sintered diamond (SD) as the material of an anvil can generate pressure much higher than WC-Co. Three types of methods using SD anvils are described: “6-2 type” system in which a pair of Bridgman anvils are embedded in an octahedral cell of a cubic press, Drickamer cell, and “6-8 type” system in which the second-stage eight anvils are compressed by the first-stage six anvils. By using them, the simultaneous performance of the resistance measurement and X-ray diffraction at room temperature, the electrical detection of the superconducting transition at low temperature and X-ray diffraction at high temperature were carried out, respectively. Pressure calibration was made by the use of α→ε transition pressure in Fe-V alloys, the superconducting transition temperature as a function of pressure in Pb, or the lattice parameter of NaCl or Au. As a strong X-ray can pass through SD with Co binder, X-ray diffraction experiment is possible for the press geometry in which it is impossible for WC-Co anvil.
