A pressure-volume-temperature equation of state for Sn(β) by energy dispersive X-ray diffraction in a heated diamond-anvil cell

Pressure-volume-temperature behavior of ?-Fe2SiO4 (spinel) based on static compression measurements at 400� C

“…The y-Fe2SiO4 isochores shown on Fig. 5 have very little curvature [(0 2 T/OPZ)v ~-0], especially at T=>400 ~ C. These essentially straight 7-Fe zsiO 4 isochores are qualitatively similar to the isochores for the low-pressure (fl) polymorph of metallic tin as determined by Cavaleri et al (1988) using the same experimental system. On the other hand, the 7-F%SiO 4 isochores in Fig.…”

Pressure-volume-temperature behavior of fayalite based on static compression measurements at 400� C

“…In all cases, the temperatures reported in this paper are those at the location of the sample thermocouple. No corrections have been made for the effects of pressure on the emf of the sample thermocouple for the reasons discussed by Cavaleri et al (1988). We estimate that the maximum uncertainty in our reported sample temperatures is _+2% of T-T o, Cavaleri and Stout (1988) discuss in detail the procedure for optimizing the precision and accuracy of lattice parameter measurements made by energy-dispersive X-ray diffraction through a diamond-anvil pressure cell.…”

“…No corrections have been made for the effects of pressure on the emf of the sample thermocouple for the reasons discussed by Cavaleri et al (1988). We estimate that the maximum uncertainty in our reported sample temperatures is _+2% of T-T o, Cavaleri and Stout (1988) discuss in detail the procedure for optimizing the precision and accuracy of lattice parameter measurements made by energy-dispersive X-ray diffraction through a diamond-anvil pressure cell. We used a diffraction angle of 9.15 ~ 20 in order to simultaneously maximize the intensity and separation of the strongest fayalite diffraction peaks and to keep the NaF (200) diffraction peak within the region of acceptable efficiency of our detector.…”

“…at room temperature and room pressure. This equation is derived by integrating the identity dV/V= c~ e d T-dP/K r after assuming that e and K each vary linearly with both Tand P. Details of the derivation of (2) are discussed by Plymate and Stout (1989); applications of the equation to the P-V-Tbehavior of the polymorphs of metallic tin are discussed by Cavaleri et al (1988) and Plymate et al (1988).…”

Thermal disproportionation of SnO under high pressure

“…The melting point of h-Sn (Sn-I) is T m = 505 K at ambient pressure and readily increases with increasing pressure [13]. There are numerous investigations on the polymorphic transformations of Sn under pressure [14][15][16][17][18]. At 273 K the phase sequence is: a-SnYSn-IYSn-IIYSn-III.…”