continuous weight loss
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2012 ◽  
Vol 9 (4) ◽  
pp. 1929-1940 ◽  
Author(s):  
Mousami Sharma ◽  
Anju Sharma ◽  
Renu Sachar

A series of 1:1 adducts of bis(morpholinedithiocarbamato) complex of VO(IV), 1:1 and 1:2 adducts of bis(morpholinedithiocarbamato) complexes of Ni(II) and Cu(II) with piperidine and morpholine have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibility, IR, UV-Vis, and TGA/DTA techniques. Analytical data reveals that VO(IV) complex forms only 1:1 adducts with the formula [VO(morphdtc)2L].H2O while Ni(II) and Cu(II) complexes form both 1:1 and 1:2 adducts with 1:1 adducts having general formula Ni(morphdtc)2.L and Cu(morphdtc)2.L and 1:2 adducts having general formula Ni(morphdtc)2.L2and Cu(morphdtc)2.L2(morphdtc = morpholinedithiocarbamate, L = morpholine and piperidine). Antifungal activity of some complexes has been carried out against the fungal strainFusarium oxysporium. Thermal studies indicate a continuous weight loss. A square pyramidal geometry has been proposed for the 1:1 adducts of Ni(II) and Cu(II) complexes while an octahedral geometry has been proposed for the 1:1 adducts of VO(IV) and for the 1:2 adducts of Ni(II) and Cu(II) complexes.


2003 ◽  
Vol 18 (3) ◽  
pp. 560-566 ◽  
Author(s):  
M. T. Buscaglia ◽  
M. Leoni ◽  
M. Viviani ◽  
V. Buscaglia ◽  
A. Martinelli ◽  
...  

The synthesis of BaSn(OH)6 acicular crystals by precipitation at 100 °C from aqueous solutions and their transformation in the perovskitelike compound BaSnO3 was investigated. Single acicular crystals 100–200 μm in length were obtained from a 0.05M solution, whereas bundlelike aggregates of 20–40 μm were precipitated from 0.2–0.6 M solutions. The x-ray diffraction pattern of barium hexahydroxostannate was indexed according to monoclinic symmetry with cell parameters a = 11.029 ± 0.002 Å, b = 6.340 ± 0.001 Å, c = 10.563 ± 0.001 Å = 128.51 ± 0.01°, α = γ = 90°. The BaSn(OH)6 particles decomposed to BaSnO3 and water at approximately 270 °C and the original morphology was retained. The resulting product had specific surface area up to 30–40 m2/g and consisted of 10–20 nm crystallites. The larger unit cell edge in comparison to the reference value and the continuous weight loss up to 1200 °C indicate that water is not completely released during decomposition and a substantial amount of proton defects (up to 0.4 mol per mole of BaSnO3) is incorporated in the perovskite lattice as OH− groups. Normal crystallographic properties of BaSnO3 are restored only after calcination at 1300 °C.


1962 ◽  
Vol 40 (9) ◽  
pp. 1769-1776 ◽  
Author(s):  
J. M. Toguri ◽  
L. M. Pidgeon

The production of magnesium by the following reaction has been studied:[Formula: see text]The rate of reaction (a) was followed by continuous weight loss measurements of the reactants. Keeping the particle size of the reactants and size and shape of the charge constant, the following factors which affect the yield of magnesium were investigated: (1) temperature, from 1050–1560 °C; (2) pressure, from less than 1 µ to 261 mm of Hg; (3) catalysts, CaF2, BaF2, and MgF2; and (4) ferrosilicon grade, from 18.7% to 96.7% Si.It was found that the yield increased by a factor 1.55 for a 50° increase in temperature over the temperature range investigated. At temperatures below 1300 °C the yield falls linearly with increase in pressure, while at temperatures above 1300 °C the yield remains relatively constant until the pressure exceeds the equilibrium magnesium pressure. All fluoride additions were found to increase the yield, CaF2 being the most effective. The rate of the reaction was also found to have a direct relationship with the silicon activity.


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