Under high pressure, triply bonded molecular nitrogen dissociates into singly polymeric nitrogen, a potential high-energy-density material. The discovery of stable high-pressure forms is great interest. We report the striking stabilization cagelike diamondoid at pressures predicted by first-principles structural searches. structure has not been seen in any other elements, and it adopts highly symmetric body-centered cubic with lattice sites occupied diamondoids, each which consists ten...

Cotton is white gold across the globe and composed of fiber cells derived from outer integument cotton ovules. Fiber elongation uses sucrose as a direct carbon source. The molecular mechanism transcriptionally controlling transport ovules into elongating fibers remains elusive. In this study involvement GhMYB212 in regulation transportion expanding was investigated. RNAi plants (GhMYB212i) accumulated less glucose developing fibers, had shorter lower lint index. RNA-seq protein-DNA binding...

Superionic conductors feature fast super-ion diffusion in the solid-state framework, making them ideal materials for safe, high-performing electrolytes. It is, therefore, hot pursuit of seeking electrolyte with high energy density and flexible operation conditions. Here, we verified a class two-dimensional superionic conduction A(BC)2, which A are alkaline earth metals such as Be, Mg, Ca, boron–carbon (BC) form graphene-like layers. Our first-principles molecular dynamics simulation, boosted...

Abstract Graphitic carbon nitride (g‐CN) films are important components of optoelectronic devices, but current techniques for their production, such as drop casting and spin coating, fail to deliver uniform pinhole‐free g‐CN on solid substrates. Here, versatile, cost‐effective, large‐area growth is achieved by using a thermal vapor condensation method under atmospheric pressure. A comparison the X‐ray diffraction Fourier transform infrared data with calculated spectrum confirmed graphitic...

Additional electrons can drastically change the bonding trend of light elements. For example, N atoms in alkali metal azides form linear N3− anions instead N2 molecules with introduction additional electrons. The effect on polymerization under pressure is important and thus far unclear. Using first principles density functional methods particle swarm optimization structure search algorithm, we systematically study evolution LiN3 structures pressures up to 600 GPa. A stable featuring...

We report passively Q-switched ∼2 and ∼3 μm mid-infrared (MIR) solid-state lasers with a self-assembly solvothermal-synthesized Bi2Te3/graphene heterostructure saturable absorber (SA) for the first time. Based on oxidation resistance high thermal conductivity of graphene, large modulation depth Bi2Te3 nanosheets, two high-performance Q-switching were realized. One is Tm:YAP laser maximum average output power 2.34 W pulse width 238 ns at μm. The corresponding peak was 91 W, which much...

Heavily Er3+-doped and Er3+/Pr3+ co-doped Gd3Ga5O12 (abbreviated as Er : GGG Er,Pr GGG, respectively) laser crystals were synthesized by the Czochralski method. The characterized absorption, up-conversion fluorescence, near-infrared (NIR) mid-infrared (Mid-IR) luminescence decay measurements. optical parameters related to absorption emission cross-sections fluorescence lifetimes evaluated compared. It was found that NIR weaken, at same time Mid-IR intensity strengthens with increment of...

Alkali metal azides can be used as starting materials in the synthesis of polymeric nitrogen, a potential high-energy-density material. The structural evolutionary behaviors nitrogen CsN3 have been studied up to 200 GPa using particle swarm optimization structure search combining with density functional theory. Three stable new phases C2/m, P21/m, and P-1 at pressure 6, 13, 51 are identified for first time. phase transition chain like (P-1 phase) occurs modest GPa, azide ions N3 (-) (linear...

A naked cyclo-N5– salt has yet to be recovered ambient conditions, precluding its application as a high-energy density material for explosive or propulsion applications. Here, we suggest simple route the synthesis of metal via compressing CuN6. Using first-principles calculations with structural search, predict CuN5 compound anion that is energetically favorite in pressure range 50–100 GPa. At comprises alternant-connected anions and Cu+ ions, forming zigzag chain. The copper...

We reported on a diode-end-pumped single-longitudinal-mode microchip laser using 600-μm-thick Er:GGG crystal at ∼2.7 μm, generating maximum output power of 50.8 mW and the pulsed energy 0.306 mJ, with repetition rates pumping light 300, 200, 100 Hz, respectively. The slope efficiency was 20.1%. operated in single-longitudinal mode centered about 2704 nm FWHM 0.42 nm. had fundamental beam profile quality parameter M(2) measured as 1.46. These results indicate that is potential compact...

Abstract Dirac-like topological insulators have attracted strong interest in optoelectronic application because of their unusual and startling properties. Here we report for the first time that pure insulator Bi 2 Te 3 exhibited a naturally ultrasensitive nonlinear absorption response to photoexcitation. The sheets with lateral size up few micrometers showed extremely low saturation intensities only 1.1 W/cm at 1.0 1.3 μm, respectively. Benefiting from this sensitive response, Q-switching...

Abstract Er 3+ /Yb /Pr : SrGdGa 3 O 7 crystal was firstly grown by Czochralski method. Detailed spectroscopic analyses of were carried out. Besides better absorption characteristic, the spectra show weaker up-conversion and near-infrared emissions as well superior mid-infrared emission in comparison to crystals. Furthermore, self-termination effect for 2.7 μm laser is suppressed successfully because fluorescence lifetime 4 I 13/2 lower level decreases markedly while that upper 11/2 changes...

A structural search leads to the prediction of a novel alkaline earth nitride BeN4 containing square planar N42− ring. This compound has particular chemical bonding pattern giving it potential as high-energy-density material. The P4/nmm phase may be stable under ambient conditions, with bandgap 3.72 eV. It is predicted have high thermodynamic and kinetic stability due transfer outer-shell s electrons Be atom N4 cluster, 2p orbital accommodating lone-pair N42−. total six π most striking...

The phase transition and structural evolution of KN3 are systematically studied using first-principles density functional (DFT) methods the particle swarm optimization (PSO) structure search algorithm under pressures up to 400 GPa. For first time, we identify three stable phases with , at 15.7, 41.4 298.6 analysis crystal structures new predicted reveals that N3− ions goes from linear molecules benzene-like rings then polymer chains induced by pressure. study atomic electronic changes...

The structural evolutionary behaviors of nitrogen in RbN3 have been studied up to 300 GPa using a particle swarm optimization structure searching method combined with density functional calculations. Three stable new phases P-1, P6/mmm and C2/m at pressure 30, 50 200 are identified for the first time. analysis crystal structures three predicated reveals that transition N3- ions goes from linear molecules polymeric chains, benzene-like rings then layers induced by pressure. electronic...

High-quality bulk single crystals of pure and Er3+-doped SrLaGa3O7 (SLGO) were grown successfully by the Czochralski method. The crystal structure SLGO was demonstrated. theoretical calculations based on density functional theory methods carried out crystal. Its band state presented. absorption, up-conversion, near-infrared mid-infrared fluorescence spectra, as well decay curves Er: 4I13/2 4I11/2 levels Er:SLGO measured at room temperature. spectroscopic properties including absorption...

Abstract Applications of graphitic carbon nitride (g‐CN) in photoelectrochemical and optoelectronic devices are still hindered due to the difficulties synthesis g‐CN films with tunable chemical, physical catalytic properties. Herein we present a general method alter electronic properties by annealing. We found that N atoms can be removed from networks after annealing treatment. Assisted theoretical calculations, confirm upon appropriate removal, adjacent C will form new C=C π bonds. Detailed...

Enthalpies of formation <italic>P</italic>1̄-ScN₃ and <italic>C</italic>2/<italic>m</italic>-ScN₅ are predicted relative to ScN N₂ with CALYPSO structural search.

Yb: CaGdAlO 4 (Yb: CALGO) single crystals having a series of Yb 3+ concentrations (0.5, 1.7, 2.5, 5.0, 7.2, and 8.0 at%) were grown using the Czochralski method. X-ray powder diffraction (XRD),...