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The authors report the synthesis of (La_0.9Y_0.1)H₁₀ superhydrides and their characterization using synchrotron-based, spatially resolved x-ray diffraction and electrical transport imaging. They reveal μm-scale structural inhomogeneity with coexisting cubic and hexagonal clathrate phases exhibiting distinct superconducting transition temperatures.

Superconductivity at megabar pressures has recently attracted interest in the context of hydrides. Here, the authors demonstrate superconductivity up to 26 K at high pressure in elemental titanium, and further suggest that electron correlations contribute to the high T_c.

The discovery of superconductivity in hydrides at critical temperature (T_c) near room temperature receives intensive attentions. Here the authors report experimental synthesis and discovery of superconductivity with T_c above 210 K in calcium superhydrides at 160–190 GPa.

Here, the Authors show that up-conversion in CsPbBr3 nanocrystals arises from an interaction between soft lattice vibrations and excited states, with a specific phonon mode enabling coherent and highly efficient up conversion process.

Excited state dynamics of alloyed quantum dots differ from that of binary quantum dots. Here, the authors use femtosecond spectroscopy and theoretical calculations to show that alloying tunes relaxation dynamics separately from traditional optical properties of quantum dots.

Pressures of up to 900 gigapascals (9 million atmospheres) are achieved in a laser-heated double-stage diamond cell, enabling the synthesis of Re₇N₃, and materials characterization is performed in situ using single-crystal X-ray diffraction.

The authors demonstrate that carbides with infinite chains of fused [C6] and [C5] rings are synthesized at deep planetary pressures and temperatures. Hydrolysis of these carbides may lead to polycyclic aromatic hydrocarbons in the Universe.

The authors discover high-pressure Sc₂N₆, Sc₂N₈, and ScN₅ polynitrides, synthesized at high pressure and temperature conditions, featuring a unique nitrogen catenation and previously unknown N₆⁶⁻ anions, N₈⁶⁻ anions and anionic corrugated 2D-polynitrogen layers.

The experimental studies to understand the superconductivity of superhydrides remain scarce. Here, the authors report pressure and magnetic field dependence of superconductivity in LaH₁₀, and indicate lattice vibrations strongly affect superconducting coupling.

Multi-technique synchrotron measurements support the viability of solid FeO-rich structures at Earth’s mantle base. An order-disorder transition identified in the iron defect structure of FeO may lead to unique physical properties in the region.

The ζ-N₂ phase is key for comprehending the pressure-driven molecular to polymeric shift in nitrogen. Here, the authors resolved the crystal structure of ζ-N₂ and identified a gradual delocalization of its electronic density under pressure, culminating in the initiation of nitrogen’s polymerization.

Experiments using high-intensity X-ray pulses incident on high-pressure hydrocarbons suggest that diamond formation can occur at shallower depths in icy planets and may play a role in the internal convection that generates their magnetic fields.

Deeply subducted water may have enabled the exchange of hydrogen and silicon between the mantle and core, according to high-pressure and -temperature experiments.

Investigations of the crystallization of FeSi in Fe–Si–H melt under high pressure−temperature conditions provide evidence of a new process that explains geochemical and geophysical observations at the core–mantle boundary.

The lanthanum-hydrogen system has attracted attention following the observation of superconductivity in LaH₁₀ at near-ambient temperatures and high pressures. Here authors describe the high-pressure syntheses of seven La-H phases; they report crystal structures and remarkable regularities in rare-earth element hydrides.

Under the pressure of a watery ocean, rock-forming minerals might dissolve at a planet’s rock–water interface, generating a denser-than-water layer that should be incorporated into models. The experimental data for MgO presented here are relevant to water-rich Earth-sized planets such as TRAPPIST-1 c and f, and to Uranus.

The discovery of high temperature superconductivity in hydrogen-rich compounds stimulates further extensive studies. Here, the authors report superconductivity in pressurized yttrium-hydrogen system with highest predicted T_c among binary compounds.

The planar hexazine dianion ring (N₆^2–), which had previously been predicted to exist, has now been synthesized from potassium azide (KN₃) under laser heating in a diamond anvil cell above 45 GPa; it remains metastable down to 20 GPa. By contrast, at 30 GPa an unusual N₂-containing compound with the formula K₃(N₂)₄ was produced.

High pressure experiments may yield materials with unusual combinations of properties, but typically in small amounts and unstable. Here the authors synthesize millimeter-sized samples of metallic, ultraincompressible and very hard rhenium nitride pernitride, recoverable at ambient conditions.

This work concerns a systematic study of Fe_1-xO employing complementary methods of powder and single-crystal X-ray diffraction and synchrotron Mössbauer source spectroscopy up to 94 GPa and 1700 K. It presents a structural and magnetic transitional pressure-temperature diagram of Fe_1-xO and demonstrates the complex physicochemical properties of simple Fe_1-xO binary oxide under extreme conditions.

High pressure laboratory experiments on thin film Mg₂SiO₄ show that the wadsleyite-ringwoodite phase transition occurs at approximately 500 K higher temperature than expected from bulk mineral data and may be more realistic for fine-grained, high-strain shear zones.