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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
not specified
Type of method:
thermal analysis
Melting / freezing pt.:
>= 593 - <= 672 °C
Atm. press.:
1 atm
Decomposition:
yes
Decomp. temp.:
>= 727 - <= 740 °C
Sublimation:
yes
Remarks:
evaporation
Subl. temp.:
>= 864 - <= 904 °C
Remarks on result:
other: results obtained in nitrogen atmosphere
Melting / freezing pt.:
>= 932 - <= 959 °C
Atm. press.:
1 atm
Decomposition:
yes
Decomp. temp.:
ca. 650 °C
Sublimation:
no
Remarks on result:
other: results obtained in air conditions

During the melting test of the studied cadmium sulphoselenide sample in nitrogen atmosphere, the endothermic peaks in the curve are at the temperature ranges 593 – 672 °C, 727 – 740 °C and 864 – 904 °C. The first peak indicates melting, because the mass of the sample does not change. The other peaks indicate decomposition and evaporation, because the mass of the sample starts to decrease.

 

In the oxidation test of the studied cadmium sulphoselenide sample using air atmosphere, the exothermic peaks in the curve are at the temperature ranges 555 – 664 °C, 691 – 727 °C and 792 – 817 °C. They indicate oxidation, the first peak may indicate sulphatizing, because the mass of the sample increases at the same time. The mass of the sample start to decrease at the temperature ~650 °C and it indicates decomposition and evaporation.The endothermic peak at the temperature range 932 – 959 °C may indicate melting, because the mass decreasing stops.

Conclusions:
test done according to standard protocol, useful to assess the characteristic of the substance
Executive summary:

The melting point of the substance was determined by thermo gravimetrical (TGA) measurements.

Melting of cadmium sulfoselenide starts at 593oC in nitrogen atmosphere and oxidation at 555oC.

Description of key information

Melting of cadmium sulfoselenide starts at 593°C in nitrogen atmosphere and oxidation at 555°C (Outotec, 2010).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
555 °C

Additional information