Dichte, Kompressibilität und thermische Ausdehnung des flüssigen Galliums bis 600 °C und 2500 bar.

Abstract

Messungen der Dichte des flüssigen Galliums bei Drucken bis zu 2500 bar und bei Temperaturen zwischen 50 °C und 600 °C wurden ausgeführt. Die Apparatur bestand aus einem Hochdruckautoklaven mit einem eingebauten Pyknometer aus Wolfram für das flüssige Gallium. Als Drucküberträger diente Argongas. Die Dichte wurde mit einer Genauigkeit von ± 0,03% bestimmt.

Thermodynamic properties of liquid gallium from picosecond acoustic velocity measurements

“…The data from Yu [24], Lyapin [13] and Li [20] show large discrepancies. (Inset) Comparison between our results and the data from Köster [29] and Tamura [30].…”

“…Thermodynamic properties of liquid Ga up to 573 K and 10 GPa. the data from Köster [29] up to 0.25 GPa. According to the authors the density was determined a high pressure autoclave with an accuracy of ±3 10 −4 .…”

“…The discussion on a possible LLPT in gallium is thus obfuscated and the lack of precision on the determination of the equation of state is one of the most important reasons. The density at high pressure has been obtained by various techniques [13,20,24,29,30] which exhibit large discrepancies. To clarify this fundamental point, the sound velocity is used in this work as it is known to be a sensitive probe to reveal an eventual phase transition [31].…”

Local Order in Liquid Gallium–Indium Alloys

“…1 cm 3 inner volume). The pycnometer was calibrated at 200 °C with pure gallium (reported density of ρ(200 °C) = 5.9737(18) g cm –3 48 ). Density data are therefore given with respect to this value.…”

“… 2 Due to its non-close-packed crystal structure, α-Ga experiences a 3% density increase upon melting, with a concomitant increase of coordination number (CN) from 1 + 6 to about 11. 3 , 4 Speculations about the persistence of Ga 2 pairs 5 or larger clusters 6 , 7 upon melting of the α-Ga modification initiated investigations of the liquid structure in an attempt to explain the characteristic high- Q shoulder observed on the first diffraction peak. 8 , 9 This shoulder is even more pronounced in the supercooled liquid 10 and resolved as a separate peak in amorphous gallium films (CN = 9.3).…”