The thermal study of vanadyl tartrates of formulae Mx(VO)y(L)2 · nH2O (where M is Na, Sr, Ca and Ba; L is tartrate), precursors of mixed oxides

J. García-Jaca; M. Insausti; J. I.R. Larramendi; M. I. Arriortua; O. Rojo; E. Hernández

doi:10.1016/0040-6031(93)80465-M

The thermal study of vanadyl tartrates of formulae M_x(VO)_y(L)₂ · nH₂O (where M is Na, Sr, Ca and Ba; L is tartrate), precursors of mixed oxides

J. García-Jaca^*
, M. Insausti
, J. I.R. Larramendi
, M. I. Arriortua
, O. Rojo
, E. Hernández

^*Autor correspondiente de este trabajo

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

3 Citas (Scopus)

Resumen

The thermal decomposition of some vanadyl tartrates of formulae Na₄[(VO)₂(C₄ H₂O₆)₂] · 12H₂O, Ca(VO)(C₄H₄O₆)₂ · 6H₂O, Sr(VO)(C₄H₄O₆)₂ · 5H₂O and [Ba₂(VO₂ (C₄H₂O₆)2(H₂O)₈] have been studied by TG and DSC techniques under non-isothermal experimental conditions. All the compounds present a three-step decomposition pattern (dehydration, ligand pyrolysis and evolution of the inorganic residue), leading to a residue corresponding to several vanadates and oxides. Kinetic analyses of the dehydration curves have been performed using the Satava integral method: random nucleation, order of reaction 1.5 and the Johnson equation have given the best correlation factors. In order to obtain mixed oxides, the complexes were fired in three different atmospheres. The oxides obtained from alkaline-earth vanadyl tartrates depend on the atmosphere employed.

Idioma original	Inglés
Páginas (desde-hasta)	203-211
Número de páginas	9
Publicación	Thermochimica Acta
Volumen	220
N.º	C
DOI	https://doi.org/10.1016/0040-6031(93)80465-M
Estado	Publicada - jun 1993
Publicado de forma externa	Sí

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title = "The thermal study of vanadyl tartrates of formulae Mx(VO)y(L)2 · nH2O (where M is Na, Sr, Ca and Ba; L is tartrate), precursors of mixed oxides",

abstract = "The thermal decomposition of some vanadyl tartrates of formulae Na4[(VO)2(C4 H2O6)2] · 12H2O, Ca(VO)(C4H4O6)2 · 6H2O, Sr(VO)(C4H4O6)2 · 5H2O and [Ba2(VO2 (C4H2O6)2(H2O)8] have been studied by TG and DSC techniques under non-isothermal experimental conditions. All the compounds present a three-step decomposition pattern (dehydration, ligand pyrolysis and evolution of the inorganic residue), leading to a residue corresponding to several vanadates and oxides. Kinetic analyses of the dehydration curves have been performed using the Satava integral method: random nucleation, order of reaction 1.5 and the Johnson equation have given the best correlation factors. In order to obtain mixed oxides, the complexes were fired in three different atmospheres. The oxides obtained from alkaline-earth vanadyl tartrates depend on the atmosphere employed.",

author = "J. Garc{\'i}a-Jaca and M. Insausti and Larramendi, \{J. I.R.\} and Arriortua, \{M. I.\} and O. Rojo and E. Hern{\'a}ndez",

year = "1993",

month = jun,

doi = "10.1016/0040-6031(93)80465-M",

language = "English",

volume = "220",

pages = "203--211",

journal = "Thermochimica Acta",

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TY - JOUR

T1 - The thermal study of vanadyl tartrates of formulae Mx(VO)y(L)2 · nH2O (where M is Na, Sr, Ca and Ba; L is tartrate), precursors of mixed oxides

AU - García-Jaca, J.

AU - Insausti, M.

AU - Larramendi, J. I.R.

AU - Arriortua, M. I.

AU - Rojo, O.

AU - Hernández, E.

PY - 1993/6

Y1 - 1993/6

N2 - The thermal decomposition of some vanadyl tartrates of formulae Na4[(VO)2(C4 H2O6)2] · 12H2O, Ca(VO)(C4H4O6)2 · 6H2O, Sr(VO)(C4H4O6)2 · 5H2O and [Ba2(VO2 (C4H2O6)2(H2O)8] have been studied by TG and DSC techniques under non-isothermal experimental conditions. All the compounds present a three-step decomposition pattern (dehydration, ligand pyrolysis and evolution of the inorganic residue), leading to a residue corresponding to several vanadates and oxides. Kinetic analyses of the dehydration curves have been performed using the Satava integral method: random nucleation, order of reaction 1.5 and the Johnson equation have given the best correlation factors. In order to obtain mixed oxides, the complexes were fired in three different atmospheres. The oxides obtained from alkaline-earth vanadyl tartrates depend on the atmosphere employed.

AB - The thermal decomposition of some vanadyl tartrates of formulae Na4[(VO)2(C4 H2O6)2] · 12H2O, Ca(VO)(C4H4O6)2 · 6H2O, Sr(VO)(C4H4O6)2 · 5H2O and [Ba2(VO2 (C4H2O6)2(H2O)8] have been studied by TG and DSC techniques under non-isothermal experimental conditions. All the compounds present a three-step decomposition pattern (dehydration, ligand pyrolysis and evolution of the inorganic residue), leading to a residue corresponding to several vanadates and oxides. Kinetic analyses of the dehydration curves have been performed using the Satava integral method: random nucleation, order of reaction 1.5 and the Johnson equation have given the best correlation factors. In order to obtain mixed oxides, the complexes were fired in three different atmospheres. The oxides obtained from alkaline-earth vanadyl tartrates depend on the atmosphere employed.

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U2 - 10.1016/0040-6031(93)80465-M

DO - 10.1016/0040-6031(93)80465-M

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VL - 220

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JO - Thermochimica Acta

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