Thermal properties of a newly developed barium-iron-metaphosphate glass were investigated by means of differential scanning calorimetry (DSC) and thermal mechanical analysis (TMA). DSC data show the influence of iron ions on the glass transition temperature (T g ) and TMA shows that the ...
The new zinc barium metaphosphate glasses (50-x)BaO-xZnO-50P 2 O 5 with 0=
The zinc barium metaphosphate glasses, (50-x)BaO-xZnO-50P 2 O 5 with 0=
The zinc–barium–metaphosphate glasses (ZBP) with composition of (50 − x)BaO–xZnO–50P 2 O 5 ; (0 ≤ x ≤ 50 mol %), have been successfully prepared. The influences of the amount of ZnO on the structure, physical and chemical properties, and crystallization behavior of the glas...
Optical fluoroaluminate glasses containing 0.3–5 mol % Ba(PO3)2 have been investigated by IR and EPR spectroscopy. It is found that the PO4 2– and PO3 2– centers play the main role in the radiation processes over the entire Ba(PO3)2 concentration range under consideration. The assumption is m...
Corner cracks were initiated in a series of lithium–magnesium-metaphosphate glasses with different Li-to-Mg ratios by performing Vickers indentation under humid conditions (RH=50% and RH=65%) and in dry nitrogen gas atmosphere (RH=0.01%). Propagation of each crack was observed up to 240h. Disti...
Following a theoretical determination of cluster-models for lithium metaphosphate glass, a theoretical method for the prediction of structural data such as radial and bond distribution functions is presented. These are calculated and compared to experimental data for this particular glass. Usefu...
A new lithium cobalt metaphosphate, LiCo(PO 3 ) 3 , is reported for the first time, which was discovered during the exploratory synthesis in Li–Co–P–O system by solid state reaction. The structure has been refined by powder X-ray Rietveld refinement method (P2 1 2 ...
Heat capacity measurements have been conducted by means of DSC on both crystalline and glassy lithium metaphosphate, from room temperature up to the melting region. The heat capacity of the glass is slightly higher than that of the crystal. Contrary to the crystal, in the neighborhood of T ...
A comparative investigation on Li+ ion transport has been carried out in various phases of lithium metaphosphate such as (i) crystalline LiPO3, (ii) glassy form as mol % 50Li2O-50P2O5, synthesized by melt-quenching process, (iii) single phase glass-ceramic LiPO3 obtained through controlled heat ...
We have sought the structural origin of the recently reported electrical conductivity of lithium copper phosphate glass system (50-x) Li2O-xCu2O-50 P2O5, as lithium oxide is gradually replaced by Cu2O. The structure of these glasses was determined by X-ray photoelectron spectroscopy, Fourier Tra...
The LiPO 3 glass crytallization have been investigated according to isothermal and non-isothermal approaches by using various techniques such as thermal analysis, helium pycnometry, scanning electronic microcospy and X-ray powder diffraction. Different experimental procedures have been d...
Research on rare earth (RE) borohydrides is increasing due to their potential as possible hydrogen storage materials and as solid-state Li-ion conductors for battery applications. In this work, we report the formation of a new bimetallic RE borohydride, KEr(BH4)4, via mechanochemical reaction be...
A simple and convenient method for the synthesis of fused dihydrofuran derivatives using NaBH 4 -mediated reductive cyclization and fused furan derivatives by K 2 CO 3 -mediated intramolecular Michael addition followed by acid-catalyzed methanol elimination has been devel...
The amorphous Co–B particles were prepared from cobalt nitrate and potassium borohydride. Ethanol-thermal treatment has been used to promote the crystallinity of Co–B particles. Both the amorphous and crystallized Co–B particles were characterized by X-ray powder diffraction (XRD), scanning e...
NaBH 4 and KBH 4 hydrolysis reactions (BH 4 − +4H 2 O→B(OH) 4 − +4H 2 ), which can be utilized as a source of high purity hydrogen and be easily controlled catalytically, are exothermic processes. Precise determination of the evolved heat ...
This paper presents a simple and low-cost micro direct borohydride fuel cell (DBFC) using a mixture of a fuel (sodium borohydride, NaBH4) and a liquid electrolyte (potassium hydroxide, KOH) in order to improve three-phase contact in micro fuel cells. It consists of an anode, cathode, and a fuel ...
This paper describes the effects of treating the alloy powder of an electrode with 6 M KOH solution containing y M KBH 4 (y=0.0, 0.005, 0.01, 0.02 and 0.03) on the kinetic properties of the electrode, including high rate dischargeablilty HRD, exchange current density I 0 , symmet...
A ZrV 0 . 5 Mn 0 . 5 Ni alloy negative electrode was modified by immersing it in an alkaline solution containing various concentrations of KBH 4 as a reducing agent. At 40°C the immersion of the electrode in alkaline 0.01 M KBH 4 solution for 24 ...
A series of nano-sized metal–chromium–molybdenum–phosphorous (M 1 x Cr 1−x Mo x P 1−x O 4 ) [M 1 =Co, Cu] oxides solid solutions have been prepared having different percentage of the constituting transition metals from their precursors metal...
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