Atomic number 78; atomic weight 195.08; melting point 1,768.2°C; boiling point 3,825°C; specific gravity 21.45 (20°C); valence 2, 3, 4. See Periodic Table. 2. A medium to light gray. [New Latin, from Spanish platina, platinum; see platina.] American Heritage® Dictionary of ...
(1) use high-purity starting materials since the mixed dissociative metal may react with Pt to form Pt-metal alloys with lower melting point; (2) use Pt crucibles with thick walls to enhance its resistance to chemical erosion; (3) set a support equipment to lessen the distortion degree of...
The calculated steady-state temperature increase due to the interaction of the electron beam with the cluster and substrate is not sufficient to cause the cluster to melt even with melting-point depression considered. The clusters remain amorphous for an average of 20 minutes on a carbon substrate...
Such a process operated at high temperatures, hence the high melting-point IPGE was preferentially crystallised along with the chromites so that podiform chromitite displays a negatively sloped PGE pattern. Normally, sulfide saturation in the ascending melt does not take place until the melt enters ...
Platinum plating can protect products from damage caused by high temperatures.Platinum has a high melting point of 3,224 degrees Fahrenheit, which is greater than other metals including titanium, iron, silver and gold. Because of this high heat resistance, coating an object in platinum can help ...
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B. et al. Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling. Proc. Natl. Acad. Sci. USA 104, 16016–16021 (2007). Article CAS ADS Google Scholar Bunch, T. E. et al. Very high-temperature impact melt ...
Working with platinum presents unique challenges and rewards for jewelers. Its high melting point—3,500°F— makes it difficult to cast, requiring specialized equipment and expertise. However, once crafted, platinum pieces offer a significant advantage — there’s no need to worry about solder ...
Does the nucleation process proceed by nanoparticles attachment, analogous to conventional growth by monomer attachment at the atomic-level? From an experimental point of view, observations at atomic resolution are highly challenging as these early events of particle growth occur rapidly. Recent advances...
3.2. Flotation of Matte Droplets in an Oxide Melt The main reason for losses is the flotation of matte droplets containing gold and platinum by gas bubbles. They appear as a result of the decomposition of sulfides during the melting of sulfide materials. From the point of view of physical ...