Ultrabroadband mid-infrared emission from Cr^(2+):ZnSe-doped chalcogenide glasses prepared via hot uniaxial pressing and melt-quenching

We reported an ultrabroadband mid-infrared(MIR)emission in the range of 1800 nm-3100 nm at room temperature(RT)from a Cr^(2+):ZnSe-doped chalcogenide glasses(ChGs)and studied the emission-dependent properties on the doping methods.A series of Cr^(2+):ZnSe/As_(40)S_(57)Se_(3)(in unit wt.%)glass-ceramics were prepared by hot uniaxial pressing(HUP)and melt-quenching methods,respectively.The glass-ceramics with MIR emission bands greater than 1000 nm were successfully prepared by both methods.The effects of matrix glass composition and grain doping concentration on the optical properties of the samples were studied.The occurrence state,morphology of the grains,and the microscopic elemental distributions were characterized using x-ray diffraction(XRD),scanning electron microscope(SEM),and energy dispersive spectrometer(EDS)analyses.

MICROSTRUCTURE OF AS-MELT-QUENCHED Ti-Si-Nd ALLOY

Rapid liquid quenching was accomplished by using an arc-melting piston and anvil apparatus.A small amount of the rare earth element Nd in melt quenched Ti80Si2o alloy promotes eutectic precipitation of β-Ti and Ti5Si3.An orientation relationship of the Ti5Si3 and the β-Ti phase is <2113>∥<001>β-Ti,(0110)∥(110)β-Ti.The alloy forming heat of the Ti5Si3 is more negative than that of the β-Ti phase and the Ti5Si3 precipitates first.

Phase Homogeneity and Crystal Structure of Sb_(88)Te_(12) Synthesized by Melt-quench Method

Phase homogeneity and crystal structure of SbsaTe12 alloy synthesized by melt-quench method have been analyzed using X-ray diffraction （XRD） and Raman spectroscopy. Rietveld refinement of crystal structure of Sb8sTe12 has revealed the formation of SbsTe3 and Sb phases respectively with 11R and A7 structures （space group is R3m）. Phase fractions of the phases SbsTe3 and Sb have been determined to be 44.44% and 55.56% respectively. Raman spectrum of SbssTe12 has showed a highest intensity peak at 156 cm-1 and another peak at 151.1 cm-1, which correspond to Alg modes of SbsTe3 and element Sb, respectively. Analysis of Raman spectrum has substantiated the results obtained from structure refinement regarding the presence of two different phases.

Nanoparticles embedded into glass matrices:glass nanocomposites

Research on glass nanocomposites(GNCs)has been very active in the past decades.GNCs have attracted—and still do—great interest in the fields of optoelectronics,photonics,sensing,electrochemistry,catalysis,biomedicine,and art.In this review,the potential applications of GNCs in these fields are briefly described to show the reader the possibilities of these materials.The most important synthesis methods of GNCs(melt-quenching,sol-gel,ion implantation,ion-exchange,staining process,spark plasma sintering,radio frequency sputtering,spray pyrolysis,and chemical vapor deposition techniques)are extensively explained.The major aim of this review is to systematize our knowledge about the synthesis of GNCs and to explore the mechanisms of formation and growth of NPs within glass matrices.The size-controlled preparation of NPs within glass matrices,which remains a challenge,is essential for advanced applications.Therefore,a thorough understanding of GNC synthesis techniques is expected to facilitate the preparation of innovative GNCs.

Synthesis/Structure and Cathode Properties of Li_2CoPO_4F for High-Voltage Li-ion Batteries

1 Results Although phospho-olivine LiFePO4 has attracted much attention as next-generation cathode, the gravimetric energy density is restricted. Fluorophosphate Li2CoPO4F is strong candidate for new high-voltage cathode with large capacity,if 2 Li+ can be reversibly removed[1]. In the present study, we tried to synthesized Li2CoPO4F by two methods, solid state reaction in vacuumed quartz tube with Pt crucible and melt-quench process using Cu single roller in Ar. The obtained latter amorphous sample was...