A team of scientists has precisely determined the temperature dependence of a mantle mineral's phase transition pressure, revealing a curved post-garnet phase boundary that accelerates upwelling plumes and decelerates subduction. This discovery could explain puzzling seismic observations in the upper part of the lower mantle.
A new method has revealed an unexpected acceleration of relaxation dynamics in compressed cerium-based metallic glass under high pressure. The study shows a non-monotonic crossover at ~3 GPa, indicating that structural details play a crucial role in glass relaxation dynamics.
Scientists have successfully triggered chemical reactions in AgI using mechanical energy equivalent to 420,000 atmospheres. This approach allows for solvent-free synthesis and could lead to the discovery of new battery electrolytes. The research used computational modeling to predict the behavior of the material under extreme pressure.
Scientists discovered that Fe-rich Fe-O alloys can exist in Earth's inner core under extreme pressure and temperature conditions. The study found stable oxygen layers between iron layers, suggesting the presence of oxygen in the solid inner core.
Researchers at HPSTAR have successfully synthesized a three-dimensional crystalline carbon nanothread (CNTh) from 2,5-furandicarboxylic acid (FDCA), a biomass precursor. The resulting CNTh shows excellent electrochemical performance as an anode material for lithium batteries.
Researchers have discovered a way to modulate the band-edge states and charge distribution of 2D halide perovskites using external pressure, enabling controllable emission properties. This breakthrough has significant implications for the design and production of high-performance electronic devices.
Researchers have discovered that aluminous silicas play a significant role in transporting water into the Earth's deep interior. These minerals can hold large amounts of water even at high temperatures, challenging previous assumptions about the water cycle in the mantle.
Researchers have successfully preserved the extraordinary properties of high-pressure materials in free-standing, nanostructured diamond capsules. This breakthrough allows for access to materials with suitable physical and chemical properties, enabling modern technology advancements.
Researchers found that even in hydrated subducting slabs, dry olivine can exist, resolving a long-standing paradox. This discovery suggests hydrous minerals play crucial roles in the Earth's interior water cycle and contribute to deep-focus earthquakes and large plate deformations.
A research group led by Dr. Qingyang Hu discovered a hydrous mineral that enters an exotic superionic phase, similar to water ice in giant planets. The team found that this superionic state may lead to a significant increase in electrical conductivity, potentially changing our understanding of Earth's mantle convection.
The study of Cs2PbI2Cl2 reveals a threefold increase in photoconductivity at 2 GPa, comparable to 3D halide perovskites. Pressure regulation modifies excitonic features, reducing exciton binding energy and facilitating carrier dissociation.
Researchers have successfully created a stable armchair-like hexazine N6 ring in tungsten hexanitride under high-pressure conditions. The compound, WN6, exhibits exceptional hardness and toughness, making it a promising candidate for high-energy-density materials.
Researchers have made the first direct measurements of the electronic band and gap of solid hydrogen up to 90 GPa using inelastic X-ray scattering. The study found that the electronic band gap decreased linearly from 10.9 eV to 6.57 eV as pressure increased, with a densification factor of 8.6.
Researchers at HPSTAR have discovered a universal relationship between regulating off-centering distortion and maximizing photoluminescence in halide perovskites. By applying high pressure, they achieved optimal PL performance, ten-fold enhancement, and new paths to high-performance optoelectronic materials.
A team of scientists has achieved strong tricolor photoluminescence (PL) in non-photoluminescent pyrochlore Ho2Sn2O7 under high-pressure treatment. The PL is retained and largely enhanced after pressure release, with the potential applications for pressure threshold sensors on extreme conditions.
Research team led by HPSTAR discovered that isotope effect can significantly suppress lattice distortion in hybrid perovskites, leading to enhanced photoluminescence and structural robustness. This breakthrough suggests a new path for designing more stable photovoltaic materials with superior performance.
A new synthesis method for crystalline graphitic nanoribbons has been developed, utilizing pressure-induced polymerization of 1,4-diphenylbutadiyne. The resulting product is a graphene nanoribbon with an armchair edge and controlled width.
The study reveals that the insulating ground state in NaOsO3 can be preserved up to 35 GPa, with a sluggish metal-insulator transition reduction from 410 K to near room temperature. The team also finds hidden hysteretic resistance properties and electronic character anomalies under pressure.
Researchers discovered a method to enhance the photoluminescent quantum yield (PLQY) of 1D metal halide C4N2H14PbB4 by suppressing non-radiative loss under high pressure. The findings reveal that pressure-tuned STE binding energy and confined motion of organic cations contribute to the PL enhancement.
Researchers successfully synthesized a pristine diamane film using high-pressure compression, demonstrating its semiconducting properties and potential applications in electronic devices. The film has an energy gap of 2.8 eV, which is higher than that of gapless graphene.
Researchers successfully converted a 2D hybrid Dion-Jacobson lead iodide perovskite to a 3D perovskite phase at ambient conditions after pressure treatment. This process enables the use of high-pressure techniques for preparing materials with improved properties, suitable for real-world applications in optoelectronics and luminescence.
A team of researchers found that applying pressure to a 2D halide perovskite suppressed carrier trapping and led to enhanced emission. The findings show a new phase with higher crystallographic symmetry and fewer trap states was formed after pressure treatment.
An international research team identified a temperature/time-dependent kinetic pathway with three distinctive transitions in the structural evolution from metastable crystalline ice (ice VII or ice VIII) to the thermodynamically stable ice I. The end result is a juxtaposition of these processes, where intermediate amorphous-ices compet...
Researchers synthesized BP-structured nitrogen using diamond anvil cell apparatus and high-power laser heating. The new material exhibits colossal Raman intensity and unusual optical properties.