Tag

High Pressure

All articles tagged with #high pressure

science25 days ago•31 min saved

Lab-made hexagonal diamond edges past regular diamond in hardness

Chinese researchers report synthesizing millimetre-sized bulk hexagonal diamond from oriented graphite under about 20 GPa and 1,300–1,900°C, with diffraction confirming a pure hexagonal carbon phase. They measured a hardness around 114 GPa, slightly higher than typical natural cubic diamond (~110 GPa), and highlight high thermal stability, addressing long-standing debate over hexagonal diamond and suggesting potential for advanced technological uses.

via Yahoo News Canada|

#carbon #diamond #hexagonal-diamond

physics-and-chemistry1 month ago•16 min saved

Lab-Forge Confirms Hexagonal Diamond, Ending a Half-Century Controversy

Chinese researchers report the synthesis of a millimeter-sized, phase-pure hexagonal diamond by compressing graphite at 20 GPa and temperatures up to 1,900°C, with X-ray and atomic-scale imaging confirming a hexagonal crystal structure; the diamond is slightly harder and more oxidation-resistant than cubic diamonds, suggesting the long-sought material exists and could have practical uses, though the hardness gain is not the often-cited 50%.

via Gizmodo|

#graphite #hexagonal-diamond #high-pressure

science1 month ago•6 min saved

Strongest evidence yet that hexagonal diamond is real and potentially harder than cubic diamond

Chinese researchers report millimeter-sized samples of hexagonal diamond (lonsdaleite) produced by compressing graphite at ~20 GPa and 1300–1900 °C, with X-ray diffraction peaks that conclusively confirm the hexagonal structure; tests show the material is stiffer, more oxidation resistant, and slightly harder than conventional cubic diamond, marking the strongest evidence to date in decades-long debates and offering potential uses in tools, thermal management, and quantum sensing.

via Nature|

#carbon #hexagonal-diamond #high-pressure

science1 month ago•8 min saved

Gold Becomes Reactive Under Megabar Pressures, Forms Stable Hydride

Researchers compressed gold in a hydrogen-rich environment to megabar pressures (>110 GPa) using a diamond anvil cell and, with ultrafast diffraction from the European XFEL, observed hydrogen incorporation into gold to form a stable gold hydride. The result shows gold’s noble behavior can break down under extreme planetary-core-like conditions, potentially altering models of gas giant interiors and suggesting new metallic hydride materials. The hydride persists only under high pressure; releasing pressure causes hydrogen to escape and gold to revert to its original state.

via Indian Defence Review|

#gold #high-pressure #hydride

science2 months ago•6 min saved

Gold Breaks Its Inert Label: A Gold-Hydrogen Compound Forms Under Planetary-Core Pressures

Under pressures above ~40 GPa and temperatures above ~2,200 K, gold forms a solid gold hydride (Au2Hx) with hydrogen diffusing freely in a hexagonal gold lattice in a superionic state. The compound is reversible, reverting to metallic gold when cooled to ambient conditions, and represents the first confirmed binary solid of gold and hydrogen. This discovery challenges gold’s reputation as chemically inert, with implications for high‑pressure physics, planetary interior modeling, and fusion diagnostics, and was observed using a diamond anvil cell and an X-ray free-electron laser.

via The Daily Galaxy|

#gold #high-pressure #hydride

science4 months ago•3 min saved

High-Pressure Studies Reveal Superconductivity in Nickelate Crystals

Researchers have achieved bulk superconductivity up to 96 K in pressurized bilayer nickelate single crystals synthesized at ambient pressure, overcoming previous growth limitations and revealing structural support for superconductivity in both monoclinic and tetragonal phases, with a correlation between higher Tc and lattice distortion.

via Nature|

#high-pressure #high-tc #nickelate

science5 months ago•2 min saved

Scientists Achieve Room Temperature Ice Creation

Scientists have created a new phase of ice, called XXI, that forms at room temperature under extreme pressure, revealing the complex variety of water's solid states and potentially explaining the composition of icy moons.

via Futurism|

#extraterrestrial #high-pressure #ice

science7 months ago•4 min saved

Researchers Discover Unprecedented New Gold Compound by Rewriting Chemical Rules

Researchers at SLAC accidentally created a new gold hydride compound by heating gold and hydrocarbons under extreme pressures and temperatures, revealing novel chemical behaviors and providing insights into dense hydrogen and fusion processes, with potential applications in planetary science and energy research.

via SciTechDaily|

#dense-hydrogen #extreme-conditions #gold-hydride

science8 months ago•4 min saved

Scientists Develop Novel Gold Hydride Under Extreme Conditions

Scientists at SLAC and European XFEL unexpectedly created solid gold hydride by combining gold and hydrogen under extreme pressure and temperature, revealing new chemistry possibilities and insights into dense hydrogen relevant to planetary interiors and fusion energy research.

via Phys.org|

#extreme-conditions #gold-hydride #high-pressure

science9 months ago•4 min saved

Understanding Heat Domes and Their Impact on Record-Breaking Temperatures

A heat dome, caused by a high-pressure system trapping warm air, is causing extreme temperatures across the eastern U.S., with warnings for health risks and record-breaking heat linked to climate change. The phenomenon acts like a lid on a pot, leading to prolonged heat and dry conditions, and is influenced by jet stream patterns. Similar events have occurred across the U.S. in recent years, with increasing severity due to global warming.

via NPR|

#climate-change #extreme-heat #heat-dome

weather2 years ago•1 min saved

"Chilly Evening Showers and Cooler Weather Ahead"

Afternoon showers and temperature drops were common today, with highs in the mid- and upper 50s. Showers will diminish tonight, leading to mostly clear skies and temperatures dipping to the mid-30s to around 40 by dawn. Saturday will see morning sunshine giving way to gray skies and a possibility of showers, with highs in the mid- to upper 50s and gusty northwest winds. Sunday will be sunnier with lighter winds and temperatures rising into the low 60s, thanks to high pressure building into the area.

via The Washington Post|

#chilly #high-pressure #showers

science2 years ago•3 min saved

"Video Shows Scientists Transforming Pure Water Into Metal"

Scientists have successfully transformed pure water into a metallic state by bringing it into contact with an electron-sharing alkali metal, inducing conductivity and a golden sheen. This breakthrough, achieved without the need for extremely high pressures, provides insight into the phase transition of water and could facilitate the study of extreme high-pressure conditions within large planets. The research, published in Nature, offers potential for replicating conditions inside planets like Neptune and Uranus, where metallic hydrogen is thought to exist.

via ScienceAlert|

#alkali-metals #conductivity #high-pressure

weather2 years ago•0 min saved

"Central Florida: Anticipating Record Heat and Minimal Rain in the Coming Week"

Central Florida is set to experience a significant warming trend, with temperatures reaching near 70 degrees on Monday and potentially hitting the 80s by Wednesday. The region can expect a mix of sun and clouds with gusty winds, and high pressure off the Florida coast will likely keep the week dry. The unseasonably warm air is attributed to this weather system, with the next chance of rain and a cooldown expected on Sunday.

via WKMG News 6 & ClickOrlando|

#central-florida #dry-weather #high-pressure

weather2 years ago•2 min saved

Phoenix: Warm Week Ahead with Possible Rainstorms

While much of the United States is experiencing a cold snap with record-breaking low temperatures and blizzard conditions, Phoenix is enjoying milder temperatures due to a pattern of warm air building underneath a ridge of high pressure. The city is expected to climb back into the low- to mid-70s late this week, into the weekend, after experiencing some low temperatures in recent days. However, a pattern change is expected to bring rain and a slight dip in temperatures to the area.

via The Arizona Republic|

#cold-snap #high-pressure #phoenix

weather2 years ago•2 min saved

"Midweek Weather Alert: Two Rainy Storms to Impact D.C. and Maryland"

Breezy conditions will slowly diminish tonight with decreasing cloud cover, leading to clear skies and temperatures in the upper 20s to mid-30s by dawn. Monday will be calm with high pressure bringing clear skies and decreasing breezes, though high clouds will increase overnight with a chance of rain showers and snow flurries. A strong storm system is expected on Tuesday, bringing threats of flooding, damaging wind gusts, and potential excessive rainfall, with the possibility of gusts exceeding 50 mph. The forecast for the previous storm was considered accurate given the marginal wintry precipitation conditions.

via The Washington Post|

#breezy #forecast #high-pressure