Preparation and Composition-Structure-Thermal Stability Relation of a Novel Open-framework Vanadium Phosphate(H_3NCH_2CH_2NH_3)_3[(VO)_4(PO_4)_2(HPO_4)_4]

A novel open-framework vanadium(W) phosphate(H_3NCH_2CH_2NH_3)_3[(VO)_4(PP_4)_2(HPO_4)_4] (short for V_2P_3-en) has been prepared. It issynthesized hydrothermally in the presence of ethylenediamine (en) at 170 deg C for 5 days byself-assembly from structurally simple precursors V_2O_5, H_3PO_4 and H_2O. The compound ischaracterized by means of Fourier transform-infrared spectroscopy (FT-IR),Thermogravimetry-differential thermal analysis (TG-DTA), X-ray powder diffraction analysis (XRD) andScanning electron microscopy (SEM). Furthermore, the composition-structure-thermal stabilityrelation of V_2P_3-en is explored in terms of crystal chemistry, and the potential approach to theenhancement of its thermal stability is proposed.

Photon-number distribution of two-mode squeezed thermal states by entangled state representation

Using the entangled state representation, we convert a two-mode squeezed number state to a Hermite polynomial excited squeezed vacuum state. We first analytically derive the photon number distribution of the two-mode squeezed thermal states. It is found that it is a Jacobi polynomial; a remarkable result. This result can be directly applied to obtaining the photon number distribution of non-Gaussian states generated by subtracting from （adding to） two-mode squeezed thermal states.

Thermal stability,mechanical properties and corrosion behavior of a Mg–Cu–Ag–Gd metallic glass with Nd addition

By the minor addition of Nb to a Mg-Cu-Ag-Gd alloy,a Mg-Cu-Ag-Gd-Nb bulk metallic glass （BMG） with improved thermal stability and corrosion resistance as well as good mechanical properties was developed.Mg54Cu26.5Ag8.5Gd11-xNbx （x=0,1） BMGs with a diameter of 2 mm were fabricated by copper-mold casting.The Mg54Cu26.5Ag8.5Gd10Nb1 BMG exhibits enlarged supercooled liquid region of 58 K.Electrochemical measurements indicate that the addition of Nb improves the corrosion resistance of the Mg-based BMG in NaCl solution evidenced by the increased corrosion potential,though no significant effect of Nb on the corrosion behavior of the BMG in NaOH solution is observed.The Mg-Cu-Ag-Gd-Nb BMG also shows high compressive strength up to 890 MPa and elastic strain of about 1.9%.

Isothermal nanocrystallization behavior of bulk metallic glass composites in supercooled liquid region

Bulk metallic glass composites （BMGCs） reinforced by micro- （spherical size of about 10 gin） and nano-sized （20-50 nm） A13Zr crystals were synthesized by copper mold suction casting method. The isothermal crystallization of Cu4oZr44AgsAls BMGCs in the super- cooled liquid region was studied by differential scanning calorimeter （DSC）, X-ray diffractometer （XRD）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The mechanisms for nucleation and growth of the crystalline phases precipitated in two-stage crystallization process and the effect of the isothermal treatment on the in situ crystalline phases were discussed. Results show that the BMGCs experience a primary crys- tallization process. Nano-sized A13Zr and Cul0Zr7 phases precipitate from the amorphous matrix successively. Fur- thermore, isothermal annealing has no effect on the pre- existing particles in the as-cast sample, which creates a new method to synthesize BMGCs strengthened by duplex crystalline phases with a large size difference. And the reinforced phase could also be dominated with intention if the as-cast BMGCs preparation and isothermal treatment process can be controlled more accurately.

Effect of Ni on the formation and thermal behavior of NdAlCo metallic glasses

Nd60All0Co30-xNix （x=0, 5, 10 and 15 at. pct） metallic glasses have been prepared using single-spinner and suck-casting method, and characterized using X-ray diffrac- tion （XRD） and non-isothermal differential scanning calorimetric technique. It has been found that the Mloy with 15 at. pct Ni has the strongest glass forming ability, and can be fabricated to a rod with 5 mm in diameter using suck-casting. The addition of Ni has an obvious effect on the thermal behavior of the metallic glasses, especially on the position of the second and third crystallization peaks. The crystallization ki- netics and activation energies of the four metallic glasses have been elaborated using the Kissinger equation. The continuous heating transformation curves of the T~ and Tpl have been constructed by applying the extension of the Vogel-Fulcher-Tammann （VFT） nonlinear equations, which are derived from the experimental data in the heat- ing rate range of 5-80 K/min. The effect of Ni on the formation and thermal stability of the Nd-based metallic glasses has been discussed.