Registration Dossier
Registration Dossier
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EC number: 222-328-5 | CAS number: 3426-45-7
Additional physico-chemical information
Administrative data
- Endpoint:
- other: thermal decomposition
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 1963
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Published data but lacking information about the preparation of the sample and the thermal analysis
Data source
Reference
- Reference Type:
- publication
- Title:
- Oxalates of Holmium, Erbium, Thulium, Ytterbium, Lutetium and Yttrium
- Author:
- S.S.Moosath, J.Abraham, T.V.Swaminathan
- Year:
- 1 963
- Bibliographic source:
- Zeitschrift für anorganische und allgemeine Chemie. Band 324
Materials and methods
Test guideline
- Qualifier:
- no guideline available
- GLP compliance:
- not specified
Test material
- Reference substance name:
- lutetium oxalate
- IUPAC Name:
- lutetium oxalate
- Test material form:
- not specified
Constituent 1
Results and discussion
- Results:
- Lutetium oxalate is decomposed by the action of temperature in Lutetium dihydrate. Then after complete dehydration, lutetium oxide is formed.
Any other information on results incl. tables
| Composition of oxalate (*) | Weight taken (g) | Total loss in weight recorded in thermobalance | Total loss on ignition (g) (**) | Temperature of complete decomposition (°C) | Temperature range of stability of dihydrate (°C) (***) |
| Lu2(C2O4)3-3H2O | 1.1100 | 0.452 | 0.450 | 690 | 220-330 |
(*) calculated from the weight of oxide obtained by ignition of a known weight of the sample
(**) computed for the weights of oxalate samples taken for decomposition on the thermobalance
(***) 1.5 hydrate
The heavy rare earth metal oxalates have not been studies in detail, there being uncertainty regarding the conditions of precipitation and the degrees of hydration of these oxalates.
These oxalates are found to give the trihydrates on drying at 110°C for six hours. When pyrolyzed on the thermobalance all of them form stable lower hydrates before complete dehydration.
The dihydrates of the oxalates of the last four members of the rare earth series (Erbium, Thulium, Terbium and Lutetium) are very stable in the range 220 to 320°C. After complete dehydration, rapid decomposition in the temperature range 400 to 460°C is another feature of this group. Maximum rates of loss in weight are shown by these oxalate. More than half of the total loss in weight takes place in this temperature range, in about 15 minutes. The anhydrous oxalates decompose to give directly the oxides, without any indication of the formation of basic carbonates. Members of this group show nearly the same temperature for complete decomposition.
Applicant's summary and conclusion
- Conclusions:
- Lutetium oxalate hydrated is decomposed in others substances by the action of the temperature
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