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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25 July 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
no guideline followed
Principles of method if other than guideline:
The method aims to investigate the temperature behaviour of the reaction mass of cerium dioxide, praseodymium oxide and zirconium dioxide. A thermogravimetric (TG) analyser together with a Differential Thermal Analysis (DTA) was used for this.
GLP compliance:
not specified
Type of method:
thermal analysis
Key result
Melting / freezing pt.:
> 800 °C
Atm. press.:
101.325 kPa
Decomposition:
no
Remarks:
only loss of physisorbed water was observed
Sublimation:
no
Remarks on result:
other: a yellow to brown powder was obtained after the experiment

Results:

1. A total weight loss of 4.12% is recorded up to 750°C with no thermal event being assigned to a melting process.

2. The main loss between room temperature and 415°C accounts for 3.19 wt% and corresponds to an exothermic event with a maximum at 65°C.

3. The second weight loss occurring between 415 and 760°C is measured to be 0.93 wt% and is accompanied by a shallow endotherm.

The mass loss can be attributed to loss of physisorbed water from the powder surface.

Conclusions:
TG/DTA scan proves that the reaction mass of cerium dioxide, praseodymium oxide and zirconium dioxide does not melt when heated from room temperature up to 800°C, the final product being a yellow to brown powder. The mass loss (4.12% in total) can be attributed to loss of physisorbed water from the powder surface.

Description of key information

Based on the TG/DTA (Dvininov, 2017; Klimisch 2) it can be concluded that the reaction mass of cerium dioxide, praseodymium oxide and zirconium dioxide does not melt when heated from room temperature up to 800°C, the final product being a yellow to brown powder. The mass loss (4.12% in total) can be attributed to loss of physisorbed water from the powder surface.

Key value for chemical safety assessment

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