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

Content Provider	Springer Nature Link
Author	Bapat, L. Natu, G. N. Bhide, M. Kher, J.
Copyright Year	1997
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 BaCO$_{3}$ 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 Cu$_{2}$O, La$_{2}$O$_{2}$CO$_{3}$ and BaCO$_{3}$ phases while endothermic peaks around 863 and 1083 K are assigned for BaCuO$_{2}$ and La$_{2}$CuO$_{4}$ phases respectively in the case of former (1∶1∶1) and endothermic peaks at about 1068, 1136 and 1213 K are correlated with BaCuO$_{2}$, a composite of La$_{2}$O$_{3}$, La$_{2}$CuO$_{4}$ and La$_{0.5}$Ba$_{0.5}$CuO$_{3−δ}$ (δ→0.5) phases and LaBa$_{2}$Cu$_{3}$O$_{7−δ}$ (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:
Starting Page	819
Ending Page	834
Page Count	16
File Format	PDF
ISSN	00225215
Journal	Journal of thermal analysis
Volume Number	48
Issue Number	4
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	composites of cuprates DTA mixture of oxalates TG XRD Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article

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