Bi Phase Transitions below 80°K to 150 Kbars in an Ar Pressure Medium
Resistometric measurements on thin film Bi specimens embedded in a solid Ar pressure medium were made to 150 kbars in the temperature range of 40° to S0°K. The ratio of longitudinal to transverse acoustic velocity was simultaneously measured on the Ar medium and the EOS of Ar deduced. Correlation is made between the changes in the resistance due to polymorphic phase transitions in Bi and the pressure deduced from the Ar EOS, The present data will be compared with earlier results on Bi embedded in a pyrophyllite medium which suggests large non-hydrostatic medium effects in pyrophyllite at low temperatures. Experimental details will be discussed.
KeywordsVelocity Ratio Acoustic Velocity Pressure Scale Polymorphic Phase Transition High Pressure Measurement
Unable to display preview. Download preview PDF.
- 3.M.A. Il’ina and E.S. Itskevich, Sov. Phys. Sol. State 8, 1873 (1967).Google Scholar
- 5.N. Mori, S. Yomo and T. Mitsui, Phys. Lett. 34A, 190 (1971).Google Scholar
- 6.E.F. Skelton, I.L. Spain, S.C. Yu, C.Y. Liu and E.R. Carpenter, Rev. Sci. Inst. 48, July 1977 (in press).Google Scholar
- 7.C.G. Homan, J. Frankel, D.P. Kendall, J.A. Barrett and T.E. Davidson, “Acoustic Velocity Ratio is Solid Ar at 75°K up to Static Pressures of 150 Kbar, “Submitted to 6th AIRAPT International High Pressure Conference, Boulder, CO, July 1977.Google Scholar
- 9.J. Frankel, F.J. Rich, C.G. Homan, M.A. Hussain and R.D. Scanlon, “The Use of the Isotropic NaCl Acoustic Velocity Ratio in Ultra High Pressure Physics,” Submitted to the 6th AIRAPT Meeting (ref. 7).Google Scholar
- 10.J.R. Barker and E.R. Dobbs, Phil. Mag. 46, 1069 (1955).Google Scholar
- 14.D. Kendall private communication.Google Scholar