THE THERMAL DECOMPOSITION OF LANTHANUM OXALATE
Anhydrous lanthanum oxalate is stable at 320 deg C. On heating this salt at higher temperatures intermediates are produced which appear to correspond to definite compositions, but they are contaminated with finely dispersed car bon. The course of the decomposition in vacuum, as followed by measuring the increase of pressure, is typical of some branching chain reactions in solids, and Prout and Tompkins' equation applies. The constant high propontion of carbon dioxide in the evolving gases, the infra-red spectra of the solid residues and other experimental results, are explained by the initial conversion of the oxalate into carbonate and carbon monoxide. The latter dispropontionates into carbon dioxide and carbon, under the high pressure existing in the channels through which the gases surge out of the decomposing crystallites. The compositions of the intermediates obtained at temperatures up to 420 deg C are given. Ths activation energy of the initial decomposition of the oxalate is 31.7 kcal/mole. (auth)
- Research Organization:
- Hebrew Univ., Jerusalem
- NSA Number:
- NSA-15-015528
- OSTI ID:
- 4032397
- Journal Information:
- J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 16
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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