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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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.

Original language	English
Pages (from-to)	203-211
Number of pages	9
Journal	Thermochimica Acta
Volume	220
Issue number	C
DOIs	https://doi.org/10.1016/0040-6031(93)80465-M
Publication status	Published - Jun 1993
Externally published	Yes

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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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number = "C",

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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.

UR - https://www.scopus.com/pages/publications/11544363074

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

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

M3 - Article

AN - SCOPUS:11544363074

SN - 0040-6031

VL - 220

SP - 203

EP - 211

JO - Thermochimica Acta

JF - Thermochimica Acta

IS - C

ER -

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

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