Trialuminium bismuth hexaoxide

Melting point / freezing point

Link to relevant study record(s)

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:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

other: Differential scanning calorimetry and metal block (capillary) method

Melting / freezing pt.:

> 450 °C

Atm. press.:

101.3 kPa

Decomposition:

ambiguous

Sublimation:

no

The test substance was heated to a maximum of 450 °C in the DSC analysis and 300 °C using a metal block analysis method. No changes indicating that the substance melted were observed (i.e. the melting point is considered to be > 450 °C).

In the metal block analysis, the substance underwent a transient color change from 190 °C (turning yellow/brown from off white), with evidence of drying observed at 206 °C. No presence of the yellow/brown color change was noted from 225 °C up to 300 °C. The cause of the color change and the wide thermal events noted in the DSC thermograms could not be conclusively explained, although these likely relate to changes in non-labile water content present in the test item’s crystal structure. Other possibilities such as decomposition, surface oxidation and rearrangement of the crystal structure itself could not be ruled out.

Conclusions:

The melting point of the test substance was deemed to be greater than the highest temperature utilised on study (450°C).

Description of key information

The melting point of the substance was considered using both DSC and capillary techniques. The test substance was heated to a maximum of 450°C in the DSC analysis and 300°C using a metal block analysis method. No changes indicating that the substance melted were observed (i.e. the melting point is considered to be > 450°C). As such, no relevant value is available as the key value for chemical safety assessment.