Investigation of the phase diagram for the system Ni(NO3)2-H2O and examination of the decomposition of Ni(NO3)2 · 6H2O

Paulik, F.; Paulik, J.; Arnold, M.

doi:10.1016/0040-6031(87)80167-3

Cited by 26 publications

(13 citation statements)

References 14 publications

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“…Nickel oxide is widely used for the preparation of catalysts and molecular sieves [4,5]. Various research workers have reported the thermal decomposition mechanisms of nickel nitrate hexahydrate at elevated temperatures [6][7][8][9][10][11]. Similarly, UNH, its intermediate products and subsequent stable oxides at higher temperatures have also been studied [12,13].…”

Section: Introductionmentioning

confidence: 99%

Decomposition and multiphase reactions in the system UO2(NO3)2·6H2O–Ni(NO3)2·6H2O at elevated temperatures

Kalekar

Rajagopalan

Ravindran

2009

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 99%

Decomposition and multiphase reactions in the system UO2(NO3)2·6H2O–Ni(NO3)2·6H2O at elevated temperatures

Kalekar

Rajagopalan

Ravindran

2009

Journal of Nuclear Materials

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“…In general, the hydrated double salts are frequently employed as mixed oxide precursors for several applications. − The cobalt and nickel nitrates, which easily form substitutional solid solutions in large domains of temperatures and compositions, could lead, after decomposition, to mixed oxides of a controlled and homogeneous composition. They could benefit from the advantages of the soft chemistry processes, particularly their formation at low temperatures (<673 K).…”

Section: Introductionmentioning

confidence: 99%

Widespread Solid Solutions of Hexahydrated Cobalt and Nickel Nitrates: Solid–Liquid Equilibria at 273.15 and 303.15 K and Characterization of Mixed Crystals of Homogeneous Composition

et al. 2017

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The isothermal solubility curves of the H 2 O−Co(NO 3 ) 2 − Ni(NO 3 ) 2 ternary system were studied at 273.15 and 303.15 K, using a synthetic method based on conductivity measurements. The analysis of the equilibrium phases' composition was conducted by UV−visible spectroscopy. The solid phases were first characterized by powder X-ray diffraction, which showed the formation of two substitutional solid solutions:which has a triclinic structure. Then the evolution of the lattice parameters of the crystals at 303.15 K, depending on the solid solution composition, was studied by single-crystal X-ray diffraction. The shrinkage of the monoclinic lattice increases with the increase of the nickel ions in the structure. The stability area of this solid solution is very wide as more than 7 cobalt ions in 10 could be replaced by nickel ions. However, the variation of the lattice parameters of the triclinic solid solutions remains limited, although a small shift of the diffraction peaks is observed. This is consistent with a limited composition area of the triclinic solid solution, where less than 1 nickel ion in 10 could be replaced by cobalt ions.

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“…For instance, while the importance of the presence of the precursor in the dissolved (or molten) state has been discussed in detail, the influence of the dissolved state of other partially dehydrated intermediates has not been addressed. From earlier work on bulk salts, it is evident that for instance hydrated nickel nitrate go through a series of dehydration/melting steps before it finally decomposes (via hydroxynitrates) to the nickel oxide phase . We therefore have carried out a study combining a range of in situ and ex situ characterization methods of the NiO/SBA-15 system where Ni(NO 3 ) 2 ·6H 2 O dissolved in ethanol was used as the precursor.…”

Section: Introductionmentioning

confidence: 99%

“…From earlier work on bulk salts, it is evident that for instance hydrated nickel nitrate go through a series of dehydration/melting steps before it finally decomposes (via hydroxynitrates) to the nickel oxide phase. 20 We therefore have carried out a study combining a range of in situ and ex situ characterization methods of the NiO/SBA-15 system where Ni(NO 3 ) 2 •6H 2 O dissolved in ethanol was used as the precursor. Total initial salt loadings well-above those needed for complete filling of the mesopores of the silica template was used in order to study the movement of the precursor into the template in detail upon thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Detailed Study of the Nanocasting Process by in Situ X-ray Scattering and Diffraction

et al. 2016

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The nanocasting method is a valuable tool for producing metal oxides with a well-defined nanostructure. However, the precise details on how the metal oxide is developed inside the mesoporous silica template remain unclear. In this study, we clarify how nickel nitrate species are evolving to nickel oxide and how they are redistributed inside mesoporous SBA-15 particles as a function of heating temperature and surrounding gas atmosphere by a combination of in situ small-angle X-ray scattering, X-ray diffraction and thermogravimetric techniques as well as ex situ transmission electron microscopy and nitrogen physisorption measurements. The SBA-15 template was initially impregnated with Ni(NO 3 ) 2 •6H 2 O using the wet infiltration method. The results indicate an initial redistribution of the nickel nitrate salt located outside the pore system into the mesopores due to dissolution, while at temperatures of 110−150 °C (depending on which type of gas flow is used) the mobility of the salt is lost due to drying of the salt. Above 220 °C, the nickel nitrate decomposes, possibly via nickel hydroxynitrate, to NiO, forming nanoparticles inside the pore channels. The results shed light on the events occurring during the nanocasting process and can be used for further optimization of the fidelity of replication.

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Investigation of the phase diagram for the system Ni(NO3)2-H2O and examination of the decomposition of Ni(NO3)2 · 6H2O

Cited by 26 publications

References 14 publications

Decomposition and multiphase reactions in the system UO2(NO3)2·6H2O–Ni(NO3)2·6H2O at elevated temperatures

Decomposition and multiphase reactions in the system UO2(NO3)2·6H2O–Ni(NO3)2·6H2O at elevated temperatures

Widespread Solid Solutions of Hexahydrated Cobalt and Nickel Nitrates: Solid–Liquid Equilibria at 273.15 and 303.15 K and Characterization of Mixed Crystals of Homogeneous Composition

Detailed Study of the Nanocasting Process by in Situ X-ray Scattering and Diffraction

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