Authors:G. Singh, B. Baranwal, I. Kapoor, D. Kumar, C. Singh, and R. Fröhlich
Three hexamethylenetetramine (HMTA) metal nitrate complexes such as [M(H2O)4(H2O-HMTA)2](NO3)·4H2O (where M=Co, Ni and Zn) have been prepared and characterized by X-ray crystallography. Their thermal decomposition have been studied
by using dynamic, isothermal thermogravimery (TG) and differential thermal analysis (DTA). Kinetics of thermal decomposition
was undertaken by applying model-fitting as well as isoconversional methods. The possible pathways of thermolysis have also
been proposed. Ignition delay measurements have been carried out to investigate the response of these complexes under condition
of rapid heating.
Authors:Marcela Stoia, Mirela Barbu, Mircea Ştefănescu, Paul Barvinschi, and Lucian Barbu-Tudoran
(NiFe 2 O 4 , LiMn 2 O 4 , and CoFe 2 O 4 ) [ 6 , 7 ].
The PVA-based synthesis methods consist usually of one-step thermal treatment of the metalnitrate–PVA solution, or of gelation, followed by calcinations. These methods allow the obtaining
Authors:Marcela Stoia, Mircea Stefanescu, Mirela Barbu, Paul Barvinschi, and Lucian Barbu-Tudoran
SiO 2 matrix, of some particular precursors, coordination compounds of the involved M II and M III cations with dicarboxylate ligands obtained in the redox reaction between metalnitrates and 1,3-propanediol. In reaction with M II (NO 3 ) 2 or M
Authors:A. Małecki, R. Gajerski, S. Łabuś, B. Prochowska-Klisch, and K. Wojciechowski
A series of six nitrates(V) hydrates of 4d-metals as well as mercury and cadmium thermal decomposition was examined by DTA,
TG and EGA techniques. It was found that thermal decomposition of d-metals nitrate(V) hydrates proceeds in three stages: partial
dehydration, oxo-nitrates and hydroxide nitrates formation and metal oxides formation. General chemical equations for all
decomposition stages were proposed. It was found that dehydration of hydrated salts is accompanied by partial decomposition
of nitrate(V) groups.
Authors:S. Békássy, T. Cseri, G. Kenessey, G. Pokol, K. Tomor, and G. Liptay
Montmorillonite-supported iron(III) nitrate and copper(II) nitrate reagents, and other supported metal nitrates prepared in
the same way, were investigated by thermal and X-ray powder diffraction methods. The metal nitrates are present on the support
in the form of crystalline hydrate and not as acetone solvate as supposed earlier. Thermal decomposition of metal nitrates
that are active in model reactions proceeds in a different way from that of the practically inactive nitrates. In the former
case, water release and nitrate decomposition itself are simultaneous process. These and other results contributed to determination
of suitable reaction conditions for the montmorillonite-supported reagents.
, rate constants have been evaluated for the overall radiolytic decomposition of alkali metal nitrates. This kinetic scheme is applicable in the low dose range. At higher doses, however, the radiation induced reaction, NO
may also contribute. The overall rate constants are 0.13×10–6 (LiNO3), 1.05×10–6 (NaNO3), 10.10×10–6 (KNO3), 9.50×10–6 (RbNO3) and 25.50×10–6 (CsNO3) kGy–1.
Two bis(bipyridine) polymeric metal nitrate complexes
with 4,4’-bipyridine of simple formula like [M(bipy)2](NO3)2⋅xH2O (where M=Co, Ni and Cu; x=4, 2 and 0, respectively) have been prepared and
characterized. Their thermal decomposition has been undertaken using simultaneous
TG-DTG-DTA and DSC in nitrogen atmosphere and non-isothermal TG in air atmosphere.
Isothermal TG has been performed at decomposition temperature range of the
complexes to evaluate the kinetics of decomposition by applying model-fitting
as well as isoconversional method. Possible mechanistic pathways have also
been proposed for the thermolysis. Ignition delay measurements have been carried
out to investigate the response of these complexes under the condition of
Lead zirconate titanate (PZT) ceramic powder has been synthesized from metal nitrate solutions using the EDTA-gel method with
different nitric acid/EDTA ratios. It was found that the thermal decomposition of the precursor was strongly affected by the
nitric acid/EDTA ratio, the amount of sample, the atmosphere, and the heating rate. Crystallization of the perovskite PZT
phase initiated at external temperatures as low as 250°C, as a result of the exothermic decomposition reaction of the nitrate-EDTA
complexes. Possible reaction schemes are suggested and discussed to describe the thermal decomposition of PZT-EDTA precursors
under different experimental conditions.
Authors:C. M. Kramer, Z. A. Munir, and J. V. Volponi
Six alkali metal nitrates and nitrites were evaporated in vacuum at a constant heating rate in a combined mass spectrometric and thermogravimetric apparatus. Time resolved profiles of decomposition gases and kinetics were obtained for LiNO3, NaNO3, KNO3, Na/KNO3, NaNO2 and KNO2. Activation energies for the evaporation of these salts were calculated and compared to previous results of isothermal experiments. In the temperature range 650–850 K, the decomposing nitrates released NO, N2 and O2 while the nitrites released only NO and N2.