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Wieczorek-Ciurowa, K.; Kozak, Adam

doi:10.1023/a:1010112814013

Cited by 162 publications

(60 citation statements)

References 1 publication

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“…The thermal decomposition intermediate products include La(NO 3 ) 2 (OH) (at 475°C) and LaO(NO 3 ) (at 537°C) respectively in the two next steps. The presence of such hydroxo-and oxonitrates was previously observed in works [53,54] concerning the thermal decomposition of transition metal hydrated nitrates. Creating of LnOX (X = CO 3 , Cl) compounds was detected during thermal decomposition of lanthanide complexes [55][56][57][58][59].…”

Section: Thermal Decompositionsupporting

confidence: 57%

The synthesis, crystal structure and thermal studies of a mixed-ligand 1,10-phenanthroline and hexamethylenetetramine complex of lanthanum nitrate. Insight into coordination sphere geometry changes of lanthanide(III) 1,10-phenanthroline complexes

Trzesowska

Kruszyński

2007

Transition Met Chem

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The structure of tetraaqua-bis(nitrato-O,O¢)-(1,10-phenanthroline-N,N¢)-lanthanum(III) 1,3,5,7-tetraazatricyclo[3.3.1.1 3,7 ]decane nitrate dihydrate, [La(NO 3 The lanthanum ion exhibits tenfold coordination and the polyhedron can be described as tetradecahedron. The complex cations, nitrate ions, water and hexamethylenetetramine molecules are assembled via hydrogen bonds, H-p rings and p-p stacking interactions into 3D supramolecular network. The bond strength of coordination sphere was calculated by means of the bond-valence method. The influence of La:phen stoichiometry and additional ligand on the changes of lanthanum(III) coordination sphere geometry in ten-coordinated complexes with 1,10-phenanthroline was discussed. The infrared spectrum of structure optimised by means of quantum mechanical calculations was analysed and compared with measured one. The obtained compound was characterised by thermogravimetric analysis in conjunction with evolved gases in the air atmosphere.

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Section: Thermal Decompositionsupporting

confidence: 57%

The synthesis, crystal structure and thermal studies of a mixed-ligand 1,10-phenanthroline and hexamethylenetetramine complex of lanthanum nitrate. Insight into coordination sphere geometry changes of lanthanide(III) 1,10-phenanthroline complexes

Trzesowska

Kruszyński

2007

Transition Met Chem

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“…1. As known in literatures [15][16][17][18], metal nitrates decompose in complicated manners with several weight-loss stages involving the release of nitrogen oxides; stable metal oxide is eventually formed via various intermediates. It is clearly seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Explosive degradation of woody biomass under the presence of metal nitrates

Terakado

Amano

Hirasawa

2009

Journal of Analytical and Applied Pyrolysis

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“…Based on thermodynamic transition temperatures [34], the fact that iron and manganese nitrate decompose into Fe 2 O 3 [35] and Mn 2 O 3 [36], and the oxide densities shown in Table 2, it seems likely the high temperature drops in apparent density seen in the iron and manganese curves are not actual drops in CGO density but the result of a lower density dopant oxide phase forming via the reactions: …”

Section: Resultsmentioning

confidence: 99%

Low Temperature Constrained Sintering of Cerium Gadolinium OxideFilms for Solid Oxide Fuel Cell Applications

Nicholas

2007

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Cerium gadolinium oxide (CGO) has been identified as an acceptable solid oxide fuel cell (SOFC) electrolyte at temperatures (500-700°C) where cheap, rigid, stainless steel interconnect substrates can be used. Unfortunately, both the high sintering temperature of pure CGO, >1200°C, and the fact that constraint during sintering often results in cracked, low density ceramic films, have complicated development of metal supported CGO SOFCs.The aim of this work was to find new sintering aids for Ce 0.9 Gd 0.1 O 1.95 , and to evaluate whether they could be used to produce dense, constrained Ce 0.9 Gd 0.1 O 1.95 films at temperatures below 1000°C. To find the optimal sintering aid, Ce 0.9 Gd 0.1 O 1.95 was doped with a variety of elements, of which lithium was found to be the most effective.Dilatometric studies indicated that by doping CGO with 3mol% lithium nitrate, it was possible to sinter pellets to a relative density of 98.5% at 800C-a full one hundred degrees below the previous low temperature sintering record for CGO. Further, it was also 2 found that a sintering aid's effectiveness could be explained in terms of its size, charge and high temperature mobility.A closer examination of lithium doped Ce 0.9 Gd 0.1 O 1.95 indicated that lithium affects sintering by producing a Li 2 O-Gd 2 O 3 -CeO 2 liquid at the CGO grain boundaries. Due to this liquid phase sintering, it was possible to produce dense, crack-free constrained films of CGO at the record low temperature of 950C using cheap, colloidal spray deposition processes. This is the first time dense constrained CGO films have been produced below 1000C and could help commercialise metal supported ceria based solid oxide fuel cells. Thesis Motivation, Background and Overview MotivationMore efficient technologies are needed if the world is to meet the doubling of energy demand that is projected to occur in the next 25 years. Given the large natural reserves of hydrocarbons and the existing infrastructure, it seems likely that traditional fuels (such as gasoline and liquefied natural gas) will retain their importance, even as alternatives such as bio-fuels enter the marketplace. Thankfully, the efficiency increases possible by electrochemically reacting these fuels inside a fuel cell instead of combusting them are considerable, making it possible to lower the environmental costs associated with their continued use. For instance, solid oxide fuel cells (SOFCs) are expected to achieve first law efficiencies of 80-85% when used with cogeneration [1]; whereas, the mostefficient combustion systems used today only achieve efficiencies of 50% [2]. Fuel Cell BasicsA fuel cell utilizing an oxygen-conducting electrolyte, such as a solid oxide fuel cell, is schematically illustrated in Figure 1. Here an oxidant (usually atmospheric O 2 ) is added to the cathode chamber of the fuel cell where it takes on electrons and destroys oxygen ion vacancies within the electrolyte by filling them with oxygen. At the same time, fuel, such as H 2 , is added to the anode chamber where i...

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Cited by 162 publications

References 1 publication

The synthesis, crystal structure and thermal studies of a mixed-ligand 1,10-phenanthroline and hexamethylenetetramine complex of lanthanum nitrate. Insight into coordination sphere geometry changes of lanthanide(III) 1,10-phenanthroline complexes

The synthesis, crystal structure and thermal studies of a mixed-ligand 1,10-phenanthroline and hexamethylenetetramine complex of lanthanum nitrate. Insight into coordination sphere geometry changes of lanthanide(III) 1,10-phenanthroline complexes

Explosive degradation of woody biomass under the presence of metal nitrates

Low Temperature Constrained Sintering of Cerium Gadolinium OxideFilms for Solid Oxide Fuel Cell Applications

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