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Reactivity of oxalates of La(III), Ba(II) and Cu(II) in ternary mixtures

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Abstract

Composites of cuprates of La(III) and Ba(II) were obtained by decomposing mixtures of oxalates of La(III), Ba(II) and Cu(II) prepared in 1∶1∶1 and 1∶2∶3 mol proportions respectively and sintering the oxide products at 1173 K. Reactions studied by TG, DTA and XRD techniques revealed the following features: (i) Decomposition of oxalates of La(III) and Ba(II) is drastically affected in mixtures. Decomposition temperature of organic part in the former (1∶1∶1) is shifted by ∼100 K while that of BaCO3 in the case of latter (1∶2∶3) is shifted by ∼400 K towards lower temperature side. (ii) All exothermic peaks on DTA traces of both the mixtures are allotted to the decomposition of oxalates to Cu2O, La2O2CO3 and BaCO3 phases while endothermic peaks around 863 and 1083 K are assigned for BaCuO2 and La2CuO4 phases respectively in the case of former (1∶1∶1) and endothermic peaks at about 1068, 1136 and 1213 K are correlated with BaCuO2, a composite of La2O3, La2CuO4 and La0.5Ba0.5CuO3−δ (δ→0.5) phases and LaBa2Cu3O7−δ (δ→0) phase respectively in the case of latter (1∶2∶3) and (iii) Lines of all cuprate compounds appear in XRD patterns of those samples preheated at temperatures ≥873 K. The following reaction is proposed in the case of 1∶2∶3 mixture:

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Authors and Affiliations

  1. Department of Chemistry, N. Wadia College, 411 001, Pune

    L. Bapat, M. Bhide & J. Kher

  2. Department of Chemistry, University of Poona, Pune, India

    G. N. Natu

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  1. L. Bapat
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  2. G. N. Natu
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  3. M. Bhide
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  4. J. Kher
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Authors are deeply thankful to the Authorities of Department of Atomic Energy (DAE), Goverment of India, for providing the funds for research project and to Professor A. V. Phadke, Department of Geology, University of Poona, for the valuable discussion.

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Bapat, L., Natu, G.N., Bhide, M. et al. Reactivity of oxalates of La(III), Ba(II) and Cu(II) in ternary mixtures. Journal of Thermal Analysis 48, 819–834 (1997). https://doi.org/10.1007/BF01997187

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